Adding upstream version 1:10.11.6.upstream/1%10.11.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 12186 insertions, 0 deletions

diff --git a/storage/spider/ha_spider.cc b/storage/spider/ha_spider.cc
new file mode 100644
index 00000000..312f94a8
--- /dev/null
+++ b/storage/spider/ha_spider.cc
@@ -0,0 +1,12186 @@
+/* Copyright (C) 2008-2019 Kentoku Shiba
+   Copyright (C) 2019-2023 MariaDB corp
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; version 2 of the License.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#ifdef USE_PRAGMA_IMPLEMENTATION
+#pragma implementation
+#endif
+
+#define MYSQL_SERVER 1
+#include <my_global.h>
+#include "mysql_version.h"
+#include "spd_environ.h"
+#include "sql_priv.h"
+#include "probes_mysql.h"
+#include "sql_class.h"
+#include "key.h"
+#include "sql_select.h"
+#include "ha_partition.h"
+#include "spd_param.h"
+#include "spd_err.h"
+#include "spd_db_include.h"
+#include "spd_include.h"
+#include "ha_spider.h"
+#include "spd_table.h"
+#include "spd_sys_table.h"
+#include "spd_trx.h"
+#include "spd_conn.h"
+#include "spd_db_conn.h"
+#include "spd_ping_table.h"
+#include "spd_malloc.h"
+
+#define SPIDER_CAN_BG_SEARCH (1LL << 37)
+#define SPIDER_CAN_BG_INSERT (1LL << 38)
+#define SPIDER_CAN_BG_UPDATE (1LL << 39)
+
+extern handlerton *spider_hton_ptr;
+extern SPIDER_DBTON spider_dbton[SPIDER_DBTON_SIZE];
+extern HASH spider_open_tables;
+extern pthread_mutex_t spider_lgtm_tblhnd_share_mutex;
+
+/* UTC time zone for timestamp columns */
+extern Time_zone *UTC;
+
+ha_spider::ha_spider(
+) : handler(spider_hton_ptr, NULL)
+{
+  DBUG_ENTER("ha_spider::ha_spider");
+  DBUG_PRINT("info",("spider this=%p", this));
+  spider_alloc_calc_mem_init(mem_calc, 139);
+  spider_alloc_calc_mem(spider_current_trx, mem_calc, sizeof(*this));
+  share = NULL;
+  conns = NULL;
+  need_mons = NULL;
+  blob_buff = NULL;
+  conn_keys = NULL;
+  spider_thread_id = 0;
+  trx_conn_adjustment = 0;
+  search_link_query_id = 0;
+  partition_handler = NULL;
+  multi_range_keys = NULL;
+  mrr_key_buff = NULL;
+  append_tblnm_alias = NULL;
+  use_index_merge = FALSE;
+  is_clone = FALSE;
+  pt_clone_source_handler = NULL;
+  pt_clone_last_searcher = NULL;
+  ft_handler = NULL;
+  ft_first = NULL;
+  ft_current = NULL;
+  ft_count = 0;
+  ft_init_without_index_init = FALSE;
+  error_mode = 0;
+  use_spatial_index = FALSE;
+  use_fields = FALSE;
+  dml_inited = FALSE;
+  use_pre_call = FALSE;
+  use_pre_action = FALSE;
+  do_direct_update = FALSE;
+  prev_index_rnd_init = SPD_NONE;
+  direct_aggregate_item_first = NULL;
+  result_link_idx = 0;
+  result_list.sqls = NULL;
+  result_list.insert_sqls = NULL;
+  result_list.update_sqls = NULL;
+  result_list.tmp_sqls = NULL;
+  result_list.tmp_tables_created = FALSE;
+  result_list.bgs_working = FALSE;
+  result_list.direct_order_limit = FALSE;
+  result_list.direct_limit_offset = FALSE;
+  result_list.set_split_read = FALSE;
+  result_list.insert_dup_update_pushdown = FALSE;
+  result_list.tmp_pos_row_first = NULL;
+  result_list.direct_aggregate = FALSE;
+  result_list.snap_direct_aggregate = FALSE;
+  result_list.direct_distinct = FALSE;
+  result_list.casual_read = NULL;
+  result_list.use_both_key = FALSE;
+  result_list.in_cmp_ref = FALSE;
+  DBUG_VOID_RETURN;
+}
+
+ha_spider::ha_spider(
+  handlerton *hton,
+  TABLE_SHARE *table_arg
+) : handler(hton, table_arg)
+{
+  DBUG_ENTER("ha_spider::ha_spider");
+  DBUG_PRINT("info",("spider this=%p", this));
+  spider_alloc_calc_mem_init(mem_calc, 0);
+  spider_alloc_calc_mem(spider_current_trx, mem_calc, sizeof(*this));
+  share = NULL;
+  conns = NULL;
+  need_mons = NULL;
+  blob_buff = NULL;
+  conn_keys = NULL;
+  spider_thread_id = 0;
+  trx_conn_adjustment = 0;
+  search_link_query_id = 0;
+  partition_handler = NULL;
+  multi_range_keys = NULL;
+  mrr_key_buff = NULL;
+  append_tblnm_alias = NULL;
+  use_index_merge = FALSE;
+  is_clone = FALSE;
+  pt_clone_source_handler = NULL;
+  pt_clone_last_searcher = NULL;
+  ft_handler = NULL;
+  ft_first = NULL;
+  ft_current = NULL;
+  ft_count = 0;
+  ft_init_without_index_init = FALSE;
+  error_mode = 0;
+  use_spatial_index = FALSE;
+  use_fields = FALSE;
+  dml_inited = FALSE;
+  use_pre_call = FALSE;
+  use_pre_action = FALSE;
+  do_direct_update = FALSE;
+  prev_index_rnd_init = SPD_NONE;
+  direct_aggregate_item_first = NULL;
+  result_link_idx = 0;
+  result_list.sqls = NULL;
+  result_list.insert_sqls = NULL;
+  result_list.update_sqls = NULL;
+  result_list.tmp_sqls = NULL;
+  result_list.tmp_tables_created = FALSE;
+  result_list.bgs_working = FALSE;
+  result_list.direct_order_limit = FALSE;
+  result_list.direct_limit_offset = FALSE;
+  result_list.set_split_read = FALSE;
+  result_list.insert_dup_update_pushdown = FALSE;
+  result_list.tmp_pos_row_first = NULL;
+  result_list.direct_aggregate = FALSE;
+  result_list.snap_direct_aggregate = FALSE;
+  result_list.direct_distinct = FALSE;
+  result_list.casual_read = NULL;
+  result_list.use_both_key = FALSE;
+  result_list.in_cmp_ref = FALSE;
+  ref_length = sizeof(SPIDER_POSITION);
+  DBUG_VOID_RETURN;
+}
+
+ha_spider::~ha_spider()
+{
+  DBUG_ENTER("ha_spider::~ha_spider");
+  DBUG_PRINT("info",("spider this=%p", this));
+  partition_handler = NULL;
+  if (wide_handler_owner)
+  {
+    spider_free(spider_current_trx, wide_handler, MYF(0));
+  }
+  wide_handler = NULL;
+  spider_free_mem_calc(spider_current_trx, mem_calc_id, sizeof(*this));
+  DBUG_VOID_RETURN;
+}
+
+handler *ha_spider::clone(
+  const char *name,
+  MEM_ROOT *mem_root
+) {
+  ha_spider *spider;
+  DBUG_ENTER("ha_spider::clone");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (
+    !(spider = (ha_spider *)
+      get_new_handler(table->s, mem_root, spider_hton_ptr)) ||
+    !(spider->ref = (uchar*) alloc_root(mem_root, ALIGN_SIZE(ref_length) * 2))
+  )
+    DBUG_RETURN(NULL);
+  spider->is_clone = TRUE;
+  spider->pt_clone_source_handler = this;
+  if (spider->ha_open(table, name, table->db_stat,
+    HA_OPEN_IGNORE_IF_LOCKED))
+    DBUG_RETURN(NULL);
+  spider->sync_from_clone_source_base(this);
+  use_index_merge = TRUE;
+
+  DBUG_RETURN((handler *) spider);
+}
+
+static const char *ha_spider_exts[] = {
+  NullS
+};
+
+const char **ha_spider::bas_ext() const
+{
+  return ha_spider_exts;
+}
+
+int ha_spider::open(
+  const char* name,
+  int mode,
+  uint test_if_locked
+) {
+  THD *thd = ha_thd();
+  int error_num, roop_count;
+  int init_sql_alloc_size;
+  ha_spider *spider, *owner;
+  bool wide_handler_alloc = FALSE;
+  SPIDER_WIDE_SHARE *wide_share;
+  uint part_num;
+  bool partition_handler_alloc = FALSE;
+  ha_spider **wide_handler_handlers = NULL;
+  ha_partition *clone_source;
+  DBUG_ENTER("ha_spider::open");
+  DBUG_PRINT("info",("spider this=%p", this));
+
+  dup_key_idx = (uint) -1;
+  conn_kinds = SPIDER_CONN_KIND_MYSQL;
+  table->file->get_no_parts("", &part_num);
+  if (part_num)
+  {
+    wide_handler_handlers =
+      (ha_spider **) ((ha_partition *) table->file)->get_child_handlers();
+    spider = wide_handler_handlers[0];
+    owner = wide_handler_handlers[part_num - 1];
+    clone_source = ((ha_partition *) table->file)->get_clone_source();
+    if (clone_source)
+    {
+      is_clone = TRUE;
+    }
+  } else {
+    spider = this;
+    owner = this;
+    clone_source = NULL;
+  }
+  if (!spider->wide_handler)
+  {
+    uchar *searched_bitmap;
+    uchar *ft_discard_bitmap;
+    uchar *position_bitmap;
+    uchar *idx_read_bitmap;
+    uchar *idx_write_bitmap;
+    uchar *rnd_read_bitmap;
+    uchar *rnd_write_bitmap;
+    if (!(wide_handler = (SPIDER_WIDE_HANDLER *)
+      spider_bulk_malloc(spider_current_trx, 16, MYF(MY_WME | MY_ZEROFILL),
+        &wide_handler, sizeof(SPIDER_WIDE_HANDLER),
+        &searched_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &ft_discard_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &position_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &idx_read_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &idx_write_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &rnd_read_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &rnd_write_bitmap,
+          (uint) sizeof(uchar) * no_bytes_in_map(table->read_set),
+        &partition_handler,
+          (uint) sizeof(SPIDER_PARTITION_HANDLER),
+        NullS)
+        )
+    ) {
+      error_num = HA_ERR_OUT_OF_MEM;
+      goto error_wide_handler_alloc;
+    }
+    spider->wide_handler = wide_handler;
+    owner->wide_handler = wide_handler;
+    wide_handler->searched_bitmap = searched_bitmap;
+    wide_handler->ft_discard_bitmap = ft_discard_bitmap;
+    wide_handler->position_bitmap = position_bitmap;
+    wide_handler->idx_read_bitmap = idx_read_bitmap;
+    wide_handler->idx_write_bitmap = idx_write_bitmap;
+    wide_handler->rnd_read_bitmap = rnd_read_bitmap;
+    wide_handler->rnd_write_bitmap = rnd_write_bitmap;
+    wide_handler->partition_handler = partition_handler;
+    wide_handler->owner = owner;
+    if (table_share->tmp_table == NO_TMP_TABLE)
+      wide_handler->top_share = table->s;
+    owner->wide_handler_owner = TRUE;
+    memset(wide_handler->ft_discard_bitmap, 0xFF,
+      no_bytes_in_map(table->read_set));
+    memset(wide_handler->searched_bitmap, 0,
+      no_bytes_in_map(table->read_set));
+    wide_handler_alloc = TRUE;
+
+  if (!share && !spider_get_share(name, table, thd, this, &error_num))
+    goto error_get_share;
+
+  wide_share = share->wide_share;
+
+    DBUG_PRINT("info",("spider create partition_handler"));
+    DBUG_PRINT("info",("spider table=%p", table));
+    partition_handler->table = table;
+    partition_handler->no_parts = part_num;
+    partition_handler->owner = owner;
+    partition_handler->parallel_search_query_id = 0;
+    spider->partition_handler = partition_handler;
+    owner->partition_handler = partition_handler;
+    partition_handler->handlers = wide_handler_handlers;
+    partition_handler_alloc = TRUE;
+  } else {
+    wide_handler = spider->wide_handler;
+    partition_handler = wide_handler->partition_handler;
+
+    if (!share && !spider_get_share(name, table, thd, this, &error_num))
+      goto error_get_share;
+
+    wide_share= share->wide_share;
+  }
+  if (wide_handler_alloc)
+  {
+    thr_lock_data_init(&wide_share->lock, &wide_handler->lock, NULL);
+  }
+
+  init_sql_alloc_size =
+    spider_param_init_sql_alloc_size(thd, share->init_sql_alloc_size);
+
+  result_list.table = table;
+  result_list.first = NULL;
+  result_list.last = NULL;
+  result_list.current = NULL;
+  result_list.record_num = 0;
+  if (
+    !(result_list.sqls = new spider_string[share->link_count]) ||
+    !(result_list.insert_sqls = new spider_string[share->link_count]) ||
+    !(result_list.update_sqls = new spider_string[share->link_count]) ||
+    !(result_list.tmp_sqls = new spider_string[share->link_count])
+  ) {
+    error_num = HA_ERR_OUT_OF_MEM;
+    goto error_init_result_list;
+  }
+  for (roop_count = 0; roop_count < (int) share->link_count; roop_count++)
+  {
+    result_list.sqls[roop_count].init_calc_mem(80);
+    result_list.insert_sqls[roop_count].init_calc_mem(81);
+    result_list.update_sqls[roop_count].init_calc_mem(82);
+    result_list.tmp_sqls[roop_count].init_calc_mem(83);
+    uint all_link_idx = conn_link_idx[roop_count];
+    uint dbton_id = share->sql_dbton_ids[all_link_idx];
+    if (share->dbton_share[dbton_id]->need_change_db_table_name())
+    {
+      if (
+        result_list.sqls[roop_count].real_alloc(init_sql_alloc_size) ||
+        result_list.insert_sqls[roop_count].real_alloc(init_sql_alloc_size) ||
+        result_list.update_sqls[roop_count].real_alloc(init_sql_alloc_size) ||
+        result_list.tmp_sqls[roop_count].real_alloc(init_sql_alloc_size)
+      ) {
+        error_num = HA_ERR_OUT_OF_MEM;
+        goto error_init_result_list;
+      }
+    }
+    result_list.sqls[roop_count].set_charset(share->access_charset);
+    result_list.insert_sqls[roop_count].set_charset(share->access_charset);
+    result_list.update_sqls[roop_count].set_charset(share->access_charset);
+    result_list.tmp_sqls[roop_count].set_charset(share->access_charset);
+  }
+
+  DBUG_PRINT("info",("spider blob_fields=%d", table_share->blob_fields));
+  if (table_share->blob_fields)
+  {
+    if (!(blob_buff = new spider_string[table_share->fields]))
+    {
+      error_num = HA_ERR_OUT_OF_MEM;
+      goto error_init_blob_buff;
+    }
+    for (roop_count = 0; roop_count < (int) table_share->fields; roop_count++)
+    {
+      blob_buff[roop_count].init_calc_mem(84);
+      blob_buff[roop_count].set_charset(table->field[roop_count]->charset());
+    }
+  }
+
+  if (is_clone)
+  {
+    if (part_num)
+    {
+      for (roop_count = 0; roop_count < (int) part_num; roop_count++)
+      {
+        if (partition_handler->handlers[roop_count]->share == share)
+        {
+          pt_clone_source_handler =
+            partition_handler->handlers[roop_count];
+          break;
+        }
+      }
+    }
+
+    wide_handler->external_lock_type =
+      pt_clone_source_handler->wide_handler->external_lock_type;
+
+    if (wide_handler_alloc)
+    {
+      wide_handler->lock_mode =
+        pt_clone_source_handler->wide_handler->lock_mode;
+      if (!partition_handler->clone_bitmap_init)
+      {
+        pt_clone_source_handler->set_select_column_mode();
+        partition_handler->clone_bitmap_init = TRUE;
+      }
+      set_clone_searched_bitmap();
+      wide_handler->position_bitmap_init = FALSE;
+      wide_handler->sql_command =
+        pt_clone_source_handler->wide_handler->sql_command;
+    }
+  } else
+    wide_handler->semi_table_lock =
+      spider_param_semi_table_lock(thd, share->semi_table_lock);
+
+  if (reset())
+  {
+    error_num = HA_ERR_OUT_OF_MEM;
+    goto error_reset;
+  }
+
+  DBUG_RETURN(0);
+
+error_reset:
+  delete [] blob_buff;
+  blob_buff = NULL;
+error_init_blob_buff:
+error_init_result_list:
+  if (partition_handler_alloc)
+  {
+    wide_share = share->wide_share;
+    spider->partition_handler = NULL;
+    owner->partition_handler = NULL;
+  }
+  partition_handler = NULL;
+  spider_free_share(share);
+  share = NULL;
+  if (conn_keys)
+  {
+    spider_free(spider_current_trx, conn_keys, MYF(0));
+    conn_keys = NULL;
+  }
+error_get_share:
+  if (wide_handler_alloc)
+  {
+    spider_free(spider_current_trx, wide_handler, MYF(0));
+    if (wide_handler_handlers)
+    {
+      wide_handler_handlers[0]->wide_handler = NULL;
+    }
+    spider->wide_handler = NULL;
+    owner->wide_handler = NULL;
+    owner->wide_handler_owner = FALSE;
+  }
+  wide_handler = NULL;
+error_wide_handler_alloc:
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::close()
+{
+  int error_num= 0, roop_count;
+  THD *thd = ha_thd();
+  backup_error_status();
+  DBUG_ENTER("ha_spider::close");
+  DBUG_PRINT("info",("spider this=%p", this));
+
+  if (multi_range_keys)
+  {
+    DBUG_PRINT("info",("spider free multi_range_keys=%p", multi_range_keys));
+    spider_free(spider_current_trx, multi_range_keys, MYF(0));
+    multi_range_keys = NULL;
+  }
+  if (mrr_key_buff)
+  {
+    delete [] mrr_key_buff;
+    mrr_key_buff = NULL;
+  }
+  while (direct_aggregate_item_first)
+  {
+    direct_aggregate_item_current = direct_aggregate_item_first->next;
+    if (direct_aggregate_item_first->item)
+    {
+      delete direct_aggregate_item_first->item;
+    }
+    spider_free(spider_current_trx, direct_aggregate_item_first, MYF(0));
+    direct_aggregate_item_first = direct_aggregate_item_current;
+  }
+  for (roop_count = share->use_dbton_count - 1; roop_count >= 0; roop_count--)
+  {
+    uint dbton_id = share->use_dbton_ids[roop_count];
+    if (dbton_handler[dbton_id])
+    {
+      delete dbton_handler[dbton_id];
+      dbton_handler[dbton_id] = NULL;
+    }
+  }
+
+  if (!thd || !thd_get_ha_data(thd, spider_hton_ptr))
+  {
+    for (roop_count = 0; roop_count < (int) share->link_count; roop_count++)
+      conns[roop_count] = NULL;
+  }
+
+  if (ft_first)
+  {
+    st_spider_ft_info *tmp_ft_info;
+    do {
+      tmp_ft_info = ft_first->next;
+      spider_free(spider_current_trx, ft_first, MYF(0));
+      ft_first = tmp_ft_info;
+    } while (ft_first);
+  }
+
+  spider_db_free_result(this, TRUE);
+  if (conn_keys)
+  {
+    spider_free(spider_current_trx, conn_keys, MYF(0));
+    conn_keys = NULL;
+  }
+  partition_handler = NULL;
+  if (wide_handler_owner)
+  {
+    spider_free(spider_current_trx, wide_handler, MYF(0));
+    wide_handler_owner = FALSE;
+  }
+  wide_handler = NULL;
+  if (blob_buff)
+  {
+    delete [] blob_buff;
+    blob_buff = NULL;
+  }
+  if (result_list.sqls)
+  {
+    delete [] result_list.sqls;
+    result_list.sqls = NULL;
+  }
+  if (result_list.insert_sqls)
+  {
+    delete [] result_list.insert_sqls;
+    result_list.insert_sqls = NULL;
+  }
+  if (result_list.update_sqls)
+  {
+    delete [] result_list.update_sqls;
+    result_list.update_sqls = NULL;
+  }
+  if (result_list.tmp_sqls)
+  {
+    delete [] result_list.tmp_sqls;
+    result_list.tmp_sqls = NULL;
+  }
+
+  spider_free_share(share);
+  is_clone = FALSE;
+  pt_clone_source_handler = NULL;
+  share = NULL;
+  conns = NULL;
+
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::check_access_kind_for_connection(
+  THD *thd,
+  bool write_request
+) {
+  int error_num, roop_count;
+  DBUG_ENTER("ha_spider::check_access_kind_for_connection");
+  DBUG_PRINT("info",("spider this=%p", this));
+  conn_kinds = 0;
+  switch (wide_handler->sql_command)
+  {
+    case SQLCOM_UPDATE:
+    case SQLCOM_UPDATE_MULTI:
+    case SQLCOM_DELETE:
+    case SQLCOM_DELETE_MULTI:
+    default:
+      conn_kinds |= SPIDER_CONN_KIND_MYSQL;
+      for (roop_count = 0; roop_count < (int) share->link_count; roop_count++)
+      {
+        conn_kind[roop_count] = SPIDER_CONN_KIND_MYSQL;
+      }
+      break;
+  }
+  if ((error_num = spider_check_trx_and_get_conn(thd, this, TRUE)))
+  {
+    DBUG_RETURN(error_num);
+  }
+  DBUG_PRINT("info",("spider wide_handler->semi_trx_isolation_chk = %s",
+    wide_handler->semi_trx_isolation_chk ? "TRUE" : "FALSE"));
+  if (wide_handler->semi_trx_isolation_chk)
+  {
+    SPIDER_SET_CONNS_PARAM(semi_trx_isolation_chk, TRUE, conns,
+      share->link_statuses, conn_link_idx, (int) share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY);
+  }
+  DBUG_PRINT("info",("spider wide_handler->semi_trx_chk = %s",
+    wide_handler->semi_trx_chk ? "TRUE" : "FALSE"));
+  if (wide_handler->semi_trx_chk)
+  {
+    SPIDER_SET_CONNS_PARAM(semi_trx_chk, TRUE, conns, share->link_statuses,
+      conn_link_idx, (int) share->link_count, SPIDER_LINK_STATUS_RECOVERY);
+  } else {
+    SPIDER_SET_CONNS_PARAM(semi_trx_chk, FALSE, conns, share->link_statuses,
+      conn_link_idx, (int) share->link_count, SPIDER_LINK_STATUS_RECOVERY);
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::check_access_kind(
+  THD *thd
+) {
+  DBUG_ENTER("ha_spider::check_access_kind");
+  DBUG_PRINT("info",("spider this=%p", this));
+  wide_handler->sql_command = thd_sql_command(thd);
+  DBUG_PRINT("info",("spider sql_command=%u", wide_handler->sql_command));
+  DBUG_PRINT("info",("spider thd->query_id=%lld", thd->query_id));
+    wide_handler->update_request = FALSE;
+  DBUG_VOID_RETURN;
+}
+
+
+THR_LOCK_DATA **ha_spider::store_lock(
+  THD *thd,
+  THR_LOCK_DATA **to,
+  enum thr_lock_type lock_type
+) {
+  DBUG_ENTER("ha_spider::store_lock");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (
+    wide_handler->stage == SPD_HND_STAGE_STORE_LOCK &&
+    wide_handler->stage_executor != this)
+  {
+    DBUG_RETURN(to);
+  }
+  wide_handler->stage = SPD_HND_STAGE_STORE_LOCK;
+  wide_handler->stage_executor = this;
+  wide_handler->lock_table_type = 0;
+  if (lock_type == TL_IGNORE)
+  {
+    *to++ = &wide_handler->lock;
+    DBUG_RETURN(to);
+  }
+  check_access_kind(thd);
+  DBUG_PRINT("info",("spider sql_command=%u", wide_handler->sql_command));
+  DBUG_PRINT("info",("spider lock_type=%d", lock_type));
+  DBUG_PRINT("info",("spider thd->query_id=%lld", thd->query_id));
+
+  wide_handler->lock_type = lock_type;
+  if (
+    wide_handler->sql_command != SQLCOM_DROP_TABLE &&
+    wide_handler->sql_command != SQLCOM_ALTER_TABLE
+  ) {
+    wide_handler->semi_trx_chk = FALSE;
+  }
+  switch (wide_handler->sql_command)
+  {
+    case SQLCOM_SELECT:
+    case SQLCOM_HA_READ:
+      if (lock_type == TL_READ_WITH_SHARED_LOCKS)
+        wide_handler->lock_mode = 1;
+      else if (lock_type <= TL_READ_NO_INSERT)
+      {
+        wide_handler->lock_mode = 0;
+        wide_handler->semi_trx_isolation_chk = TRUE;
+      } else
+        wide_handler->lock_mode = -1;
+      wide_handler->semi_trx_chk = TRUE;
+      break;
+    case SQLCOM_UPDATE:
+    case SQLCOM_UPDATE_MULTI:
+    case SQLCOM_CREATE_TABLE:
+    case SQLCOM_INSERT:
+    case SQLCOM_INSERT_SELECT:
+    case SQLCOM_DELETE:
+    case SQLCOM_LOAD:
+    case SQLCOM_REPLACE:
+    case SQLCOM_REPLACE_SELECT:
+    case SQLCOM_DELETE_MULTI:
+      if (lock_type >= TL_READ && lock_type <= TL_READ_NO_INSERT)
+      {
+        wide_handler->lock_mode = -2;
+        wide_handler->semi_trx_isolation_chk = TRUE;
+      } else
+        wide_handler->lock_mode = -1;
+      wide_handler->semi_trx_chk = TRUE;
+      break;
+    default:
+        wide_handler->lock_mode = -1;
+  }
+  switch (lock_type)
+  {
+    case TL_READ_HIGH_PRIORITY:
+      wide_handler->high_priority = TRUE;
+      break;
+    case TL_WRITE_LOW_PRIORITY:
+      wide_handler->low_priority = TRUE;
+      break;
+    default:
+      break;
+  }
+
+  if (wide_handler->lock_type != TL_IGNORE &&
+    wide_handler->lock.type == TL_UNLOCK)
+  {
+    if (
+      wide_handler->sql_command == SQLCOM_DROP_TABLE ||
+      wide_handler->sql_command == SQLCOM_ALTER_TABLE ||
+      wide_handler->sql_command == SQLCOM_SHOW_CREATE ||
+      wide_handler->sql_command == SQLCOM_SHOW_FIELDS
+    ) {
+      if (
+        lock_type == TL_READ_NO_INSERT &&
+        !thd->in_lock_tables
+      )
+        lock_type = TL_READ;
+      if (
+        lock_type >= TL_WRITE_CONCURRENT_INSERT && lock_type <= TL_WRITE &&
+        !thd->in_lock_tables && !thd_tablespace_op(thd)
+      )
+        lock_type = TL_WRITE_ALLOW_WRITE;
+    } else if (
+      wide_handler->sql_command == SQLCOM_LOCK_TABLES ||
+      (spider_param_lock_exchange(thd) == 1 && wide_handler->semi_table_lock))
+    {
+      DBUG_PRINT("info",("spider lock exchange route"));
+      DBUG_PRINT("info",("spider lock_type=%u", wide_handler->lock_type));
+      if (
+        (
+          wide_handler->lock_type == TL_READ ||
+          wide_handler->lock_type == TL_READ_NO_INSERT ||
+          wide_handler->lock_type == TL_WRITE_LOW_PRIORITY ||
+          wide_handler->lock_type == TL_WRITE
+        ) &&
+        !spider_param_local_lock_table(thd)
+      ) {
+        wide_handler->lock_table_type = 1;
+        if (partition_handler && partition_handler->handlers)
+        {
+          uint roop_count;
+          for (roop_count = 0; roop_count < partition_handler->no_parts;
+            ++roop_count)
+          {
+            if (unlikely((store_error_num =
+              partition_handler->handlers[roop_count]->
+                append_lock_tables_list())))
+            {
+              break;
+            }
+          }
+        } else {
+          store_error_num = append_lock_tables_list();
+        }
+      }
+    } else {
+      DBUG_PRINT("info",("spider default lock route"));
+      DBUG_PRINT("info",("spider lock_type=%u", wide_handler->lock_type));
+      if (
+        wide_handler->lock_type == TL_READ ||
+        wide_handler->lock_type == TL_READ_NO_INSERT ||
+        wide_handler->lock_type == TL_WRITE_LOW_PRIORITY ||
+        wide_handler->lock_type == TL_WRITE
+      ) {
+        if (
+          !spider_param_local_lock_table(thd) &&
+          spider_param_semi_table_lock(thd, wide_handler->semi_table_lock)
+        ) {
+          wide_handler->lock_table_type = 2;
+          if (partition_handler && partition_handler->handlers)
+          {
+            uint roop_count;
+            for (roop_count = 0;
+              roop_count < partition_handler->no_parts;
+              ++roop_count)
+            {
+              if (unlikely((store_error_num =
+                partition_handler->handlers[roop_count]->
+                  append_lock_tables_list())))
+              {
+                break;
+              }
+            }
+          } else {
+            store_error_num = append_lock_tables_list();
+          }
+        }
+      }
+      if (
+        lock_type == TL_READ_NO_INSERT &&
+        !thd->in_lock_tables
+      )
+        lock_type = TL_READ;
+      if (
+        lock_type >= TL_WRITE_CONCURRENT_INSERT && lock_type <= TL_WRITE &&
+        !thd->in_lock_tables && !thd_tablespace_op(thd)
+      )
+        lock_type = TL_WRITE_ALLOW_WRITE;
+    }
+    wide_handler->lock.type = lock_type;
+  }
+  *to++ = &wide_handler->lock;
+  DBUG_RETURN(to);
+}
+
+int ha_spider::external_lock(
+  THD *thd,
+  int lock_type
+) {
+  int error_num = 0;
+  SPIDER_TRX *trx;
+  backup_error_status();
+
+  DBUG_ENTER("ha_spider::external_lock");
+
+  /* Beginning of wide_handler setup */
+  if (wide_handler->stage == SPD_HND_STAGE_EXTERNAL_LOCK)
+  {
+    /* Only the stage executor deals with table locks. */
+    if (wide_handler->stage_executor != this)
+    {
+      DBUG_RETURN(0);
+    }
+  }
+  else
+  {
+    /* Update the stage executor when the stage changes. */
+    wide_handler->stage= SPD_HND_STAGE_EXTERNAL_LOCK;
+    wide_handler->stage_executor= this;
+  }
+
+  info_auto_called = FALSE;
+  wide_handler->external_lock_type= lock_type;
+  wide_handler->sql_command = thd_sql_command(thd);
+
+  trx= spider_get_trx(thd, TRUE, &error_num);
+  if (error_num)
+  {
+    DBUG_RETURN(error_num);
+  }
+  wide_handler->trx= trx;
+  /* End of wide_handler setup */
+
+  if (store_error_num)
+  {
+    DBUG_RETURN(store_error_num);
+  }
+
+  /* We treat BEGIN as if UNLOCK TABLE. */
+  if (wide_handler->sql_command == SQLCOM_BEGIN)
+  {
+    wide_handler->sql_command = SQLCOM_UNLOCK_TABLES;
+  }
+  const uint sql_command= wide_handler->sql_command;
+
+  DBUG_ASSERT(sql_command != SQLCOM_RENAME_TABLE &&
+              sql_command != SQLCOM_DROP_DB);
+
+  if (sql_command == SQLCOM_DROP_TABLE || sql_command == SQLCOM_ALTER_TABLE)
+  {
+    if (trx->locked_connections)
+    {
+      my_message(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM,
+                 ER_SPIDER_ALTER_BEFORE_UNLOCK_STR, MYF(0));
+      DBUG_RETURN(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM);
+    }
+    DBUG_RETURN(0);
+  }
+
+  if (lock_type == F_UNLCK)
+  {
+    if (sql_command != SQLCOM_UNLOCK_TABLES)
+    {
+      DBUG_RETURN(0); /* Unlock remote tables only by UNLOCK TABLES. */
+    }
+    if (!trx->locked_connections)
+    {
+      DBUG_RETURN(0); /* No remote table actually locked by Spider */
+    }
+  }
+  else
+  {
+    if (unlikely((error_num= spider_internal_start_trx(this))))
+    {
+      DBUG_RETURN(error_num);
+    }
+    if (sql_command != SQLCOM_SELECT && sql_command != SQLCOM_HA_READ)
+    {
+      trx->updated_in_this_trx= TRUE;
+    }
+    if (!wide_handler->lock_table_type)
+    {
+      DBUG_RETURN(0); /* No need to actually lock remote tables. */
+    }
+  }
+
+  if (!partition_handler || !partition_handler->handlers)
+  {
+    DBUG_RETURN(lock_tables()); /* Non-partitioned table */
+  }
+
+  for (uint i= 0; i < partition_handler->no_parts; ++i)
+  {
+    if (unlikely((error_num= partition_handler->handlers[i]->lock_tables())))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  DBUG_RETURN(0);
+}
+
+int ha_spider::start_stmt(
+  THD *thd,
+  thr_lock_type lock_type
+) {
+  DBUG_ENTER("ha_spider::start_stmt");
+  if (
+    wide_handler->stage == SPD_HND_STAGE_START_STMT &&
+    wide_handler->stage_executor != this)
+  {
+    DBUG_RETURN(0);
+  }
+  wide_handler->stage = SPD_HND_STAGE_START_STMT;
+  wide_handler->stage_executor = this;
+  DBUG_RETURN(0);
+}
+
+int ha_spider::reset()
+{
+  int error_num = 0, error_num2, roop_count;
+  THD *thd = ha_thd();
+  SPIDER_TRX *tmp_trx, *trx_bak;
+  SPIDER_CONDITION *tmp_cond;
+/*
+  char first_byte, first_byte_bak;
+*/
+  backup_error_status();
+  DBUG_ENTER("ha_spider::reset");
+  DBUG_PRINT("info",("spider this=%p", this));
+  direct_aggregate_item_current = direct_aggregate_item_first;
+  while (direct_aggregate_item_current)
+  {
+    if (direct_aggregate_item_current->item)
+    {
+      delete direct_aggregate_item_current->item;
+      direct_aggregate_item_current->item = NULL;
+      if (direct_aggregate_item_current->init_mem_root)
+      {
+        free_root(&direct_aggregate_item_current->mem_root, MYF(0));
+        direct_aggregate_item_current->init_mem_root = FALSE;
+      }
+    }
+    direct_aggregate_item_current = direct_aggregate_item_current->next;
+  }
+  result_list.direct_aggregate = FALSE;
+  result_list.snap_direct_aggregate = FALSE;
+  result_list.direct_distinct = FALSE;
+  store_error_num = 0;
+  if (wide_handler)
+  {
+    wide_handler->sql_command = SQLCOM_END;
+    wide_handler->between_flg = FALSE;
+    wide_handler->idx_bitmap_is_set = FALSE;
+    wide_handler->rnd_bitmap_is_set = FALSE;
+    wide_handler->quick_mode = FALSE;
+    wide_handler->keyread = FALSE;
+    wide_handler->ignore_dup_key = FALSE;
+    wide_handler->write_can_replace = FALSE;
+    wide_handler->insert_with_update = FALSE;
+    wide_handler->low_priority = FALSE;
+    wide_handler->high_priority = FALSE;
+    wide_handler->lock_table_type = 0;
+    wide_handler->semi_trx_isolation_chk = FALSE;
+    wide_handler->semi_trx_chk = FALSE;
+    if (!is_clone)
+    {
+      memset(wide_handler->ft_discard_bitmap, 0xFF,
+        no_bytes_in_map(table->read_set));
+      memset(wide_handler->searched_bitmap, 0,
+        no_bytes_in_map(table->read_set));
+    }
+    while (wide_handler->condition)
+    {
+      tmp_cond = wide_handler->condition->next;
+      spider_free(spider_current_trx, wide_handler->condition, MYF(0));
+      wide_handler->condition = tmp_cond;
+    }
+    wide_handler->cond_check = FALSE;
+    wide_handler->direct_update_fields = NULL;
+#ifdef INFO_KIND_FORCE_LIMIT_BEGIN
+    wide_handler->info_limit = 9223372036854775807LL;
+#endif
+    wide_handler->stage = SPD_HND_STAGE_NONE;
+    wide_handler->stage_executor = NULL;
+  }
+  if (!(tmp_trx = spider_get_trx(thd, TRUE, &error_num2)))
+  {
+    DBUG_PRINT("info",("spider get trx error"));
+    if (check_error_mode(error_num2))
+      error_num = error_num2;
+  }
+  if (share)
+  {
+    trx_bak = wide_handler->trx;
+    wide_handler->trx = tmp_trx;
+    if ((error_num2 = spider_db_free_result(this, FALSE)))
+      error_num = error_num2;
+    wide_handler->trx = trx_bak;
+    memset(need_mons, 0, sizeof(int) * share->link_count);
+    memset(result_list.casual_read, 0, sizeof(int) * share->link_count);
+    rm_bulk_tmp_table();
+    for (roop_count = share->link_count - 1; roop_count >= 0; roop_count--)
+    {
+      result_list.update_sqls[roop_count].length(0);
+
+      conn_kind[roop_count] = SPIDER_CONN_KIND_MYSQL;
+    }
+    result_list.bulk_update_mode = 0;
+    result_list.bulk_update_size = 0;
+    result_list.bulk_update_start = SPD_BU_NOT_START;
+    for (roop_count = 0; roop_count < (int) share->use_dbton_count;
+      roop_count++)
+    {
+      uint dbton_id = share->use_dbton_ids[roop_count];
+      if ((error_num2 = dbton_handler[dbton_id]->reset()))
+      {
+        if (check_error_mode(error_num2))
+          error_num = error_num2;
+      }
+    }
+  }
+  dml_inited = FALSE;
+  use_pre_call = FALSE;
+  use_pre_action = FALSE;
+  pre_bitmap_checked = FALSE;
+  bulk_insert = FALSE;
+  partition_handler->clone_bitmap_init = FALSE;
+  result_list.tmp_table_join = FALSE;
+  result_list.use_union = FALSE;
+  result_list.use_both_key = FALSE;
+  pt_clone_last_searcher = NULL;
+  conn_kinds = SPIDER_CONN_KIND_MYSQL;
+  use_index_merge = FALSE;
+  init_rnd_handler = FALSE;
+  if (multi_range_keys)
+  {
+    DBUG_PRINT("info",("spider free multi_range_keys=%p", multi_range_keys));
+    spider_free(spider_current_trx, multi_range_keys, MYF(0));
+    multi_range_keys = NULL;
+  }
+  multi_range_num = 0;
+  ft_handler = NULL;
+  ft_current = NULL;
+  ft_count = 0;
+  ft_init_without_index_init = FALSE;
+  do_direct_update = FALSE;
+  prev_index_rnd_init = SPD_NONE;
+  result_list.direct_order_limit = FALSE;
+  result_list.direct_limit_offset = FALSE;
+  result_list.set_split_read = FALSE;
+  result_list.insert_dup_update_pushdown = FALSE;
+  use_spatial_index = FALSE;
+  use_fields = FALSE;
+  error_mode = 0;
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::extra(
+  enum ha_extra_function operation
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::extra");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider operation=%d", (int) operation));
+  if (
+    wide_handler->stage == SPD_HND_STAGE_EXTRA &&
+    wide_handler->stage_executor != this)
+  {
+    DBUG_RETURN(0);
+  }
+  wide_handler->stage = SPD_HND_STAGE_EXTRA;
+  wide_handler->stage_executor = this;
+  switch (operation)
+  {
+    case HA_EXTRA_QUICK:
+      wide_handler->quick_mode = TRUE;
+      break;
+    case HA_EXTRA_KEYREAD:
+      if (!is_clone)
+      {
+        wide_handler->keyread = TRUE;
+        if (wide_handler->update_request)
+        {
+          if (check_partitioned())
+            wide_handler->keyread = FALSE;
+        }
+      }
+      break;
+    case HA_EXTRA_NO_KEYREAD:
+      wide_handler->keyread = FALSE;
+      break;
+    case HA_EXTRA_IGNORE_DUP_KEY:
+      wide_handler->ignore_dup_key = TRUE;
+      break;
+    case HA_EXTRA_NO_IGNORE_DUP_KEY:
+      wide_handler->ignore_dup_key = FALSE;
+      break;
+    case HA_EXTRA_WRITE_CAN_REPLACE:
+      wide_handler->write_can_replace = TRUE;
+      break;
+    case HA_EXTRA_WRITE_CANNOT_REPLACE:
+      wide_handler->write_can_replace = FALSE;
+      break;
+    case HA_EXTRA_INSERT_WITH_UPDATE:
+      wide_handler->insert_with_update = TRUE;
+      break;
+    case HA_EXTRA_ATTACH_CHILDREN:
+      DBUG_PRINT("info",("spider HA_EXTRA_ATTACH_CHILDREN"));
+      if (!(wide_handler->trx = spider_get_trx(ha_thd(), TRUE, &error_num)))
+        DBUG_RETURN(error_num);
+      break;
+    case HA_EXTRA_ADD_CHILDREN_LIST:
+      DBUG_PRINT("info",("spider HA_EXTRA_ADD_CHILDREN_LIST"));
+      if (!(wide_handler->trx = spider_get_trx(ha_thd(), TRUE, &error_num)))
+        DBUG_RETURN(error_num);
+      break;
+#if defined(HA_EXTRA_HAS_STARTING_ORDERED_INDEX_SCAN) || defined(HA_EXTRA_HAS_HA_EXTRA_USE_CMP_REF)
+#ifdef HA_EXTRA_HAS_STARTING_ORDERED_INDEX_SCAN
+    case HA_EXTRA_STARTING_ORDERED_INDEX_SCAN:
+#endif
+#ifdef HA_EXTRA_HAS_HA_EXTRA_USE_CMP_REF
+    case HA_EXTRA_USE_CMP_REF:
+#endif
+      DBUG_PRINT("info",("spider HA_EXTRA_STARTING_ORDERED_INDEX_SCAN"));
+      if (table_share->primary_key != MAX_KEY)
+      {
+        DBUG_PRINT("info",("spider need primary key columns"));
+        KEY *key_info = &table->key_info[table->s->primary_key];
+        KEY_PART_INFO *key_part;
+        uint part_num;
+        for (
+          key_part = key_info->key_part, part_num = 0;
+          part_num < spider_user_defined_key_parts(key_info);
+          key_part++, part_num++
+        ) {
+          spider_set_bit(wide_handler->searched_bitmap,
+            key_part->field->field_index);
+        }
+      } else {
+        DBUG_PRINT("info",("spider need all columns"));
+        Field **field;
+        for (
+          field = table->field;
+          *field;
+          field++
+        ) {
+          spider_set_bit(wide_handler->searched_bitmap, (*field)->field_index);
+        }
+      }
+      break;
+#endif
+    default:
+      break;
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_init(
+  uint idx,
+  bool sorted
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::index_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider idx=%u", idx));
+  if (!dml_inited)
+  {
+    if (unlikely((error_num = dml_init())))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+  pushed_pos = NULL;
+  active_index = idx;
+  result_list.sorted = sorted;
+  spider_set_result_list_param(this);
+  mrr_with_cnt = FALSE;
+  init_index_handler = FALSE;
+  use_spatial_index = FALSE;
+
+  if (pre_bitmap_checked)
+    pre_bitmap_checked = FALSE;
+  else {
+    if (wide_handler->external_lock_type == F_WRLCK)
+    {
+      pk_update = FALSE;
+/*
+      check_and_start_bulk_update(SPD_BU_START_BY_INDEX_OR_RND_INIT);
+*/
+      if (
+        wide_handler->update_request &&
+        share->have_recovery_link &&
+        (pk_update = spider_check_pk_update(table))
+      ) {
+        bitmap_set_all(table->read_set);
+        if (is_clone)
+          memset(wide_handler->searched_bitmap, 0xFF,
+            no_bytes_in_map(table->read_set));
+      }
+    }
+
+    if (!is_clone)
+      set_select_column_mode();
+  }
+
+  if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+    DBUG_RETURN(error_num);
+  result_list.check_direct_order_limit = FALSE;
+  prev_index_rnd_init = SPD_INDEX;
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::index_end()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_end");
+  DBUG_PRINT("info",("spider this=%p", this));
+  active_index = MAX_KEY;
+/*
+#ifdef INFO_KIND_FORCE_LIMIT_BEGIN
+  info_limit = 9223372036854775807LL;
+#endif
+  if (
+    (error_num = drop_tmp_tables()) ||
+    (error_num = check_and_end_bulk_update(
+      SPD_BU_START_BY_INDEX_OR_RND_INIT)) ||
+    (error_num = spider_trx_check_link_idx_failed(this))
+  )
+    DBUG_RETURN(check_error_mode(error_num));
+*/
+  if ((error_num = drop_tmp_tables()))
+    DBUG_RETURN(check_error_mode(error_num));
+  result_list.use_union = FALSE;
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::index_read_map_internal(
+  uchar *buf,
+  const uchar *key,
+  key_part_map keypart_map,
+  enum ha_rkey_function find_flag
+) {
+  int error_num, roop_count;
+  key_range start_key;
+  SPIDER_CONN *conn;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_read_map_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  do_direct_update = FALSE;
+  if (
+    find_flag >= HA_READ_MBR_CONTAIN &&
+    find_flag <= HA_READ_MBR_EQUAL
+  )
+    use_spatial_index = TRUE;
+
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  spider_db_free_one_result_for_start_next(this);
+  spider_set_result_list_param(this);
+  check_direct_order_limit();
+  start_key.key = key;
+  start_key.keypart_map = keypart_map;
+  start_key.flag = find_flag;
+  if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+    DBUG_RETURN(error_num);
+  if ((error_num = spider_set_conn_bg_param(this)))
+    DBUG_RETURN(error_num);
+  check_select_column(FALSE);
+  DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+  result_list.finish_flg = FALSE;
+  result_list.record_num = 0;
+  if (wide_handler->keyread)
+    result_list.keyread = TRUE;
+  else
+    result_list.keyread = FALSE;
+  if (
+    (error_num = spider_db_append_select(this)) ||
+    (error_num = spider_db_append_select_columns(this))
+  )
+    DBUG_RETURN(error_num);
+  if (
+    share->key_hint &&
+    (error_num = append_hint_after_table_sql_part(
+      SPIDER_SQL_TYPE_SELECT_SQL))
+  )
+    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+  set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+  result_list.desc_flg = FALSE;
+  result_list.sorted = TRUE;
+  result_list.key_info = &table->key_info[active_index];
+  check_distinct_key_query();
+  result_list.limit_num =
+    result_list.internal_limit >= result_list.split_read ?
+    result_list.split_read : result_list.internal_limit;
+  DBUG_PRINT("info",("spider result_list.internal_limit=%lld",
+    result_list.internal_limit));
+  DBUG_PRINT("info",("spider result_list.split_read=%lld",
+    result_list.split_read));
+  DBUG_PRINT("info",("spider result_list.limit_num=%lld",
+    result_list.limit_num));
+  if (
+    (error_num = spider_db_append_key_where(
+      &start_key, NULL, this))
+  )
+    DBUG_RETURN(error_num);
+  DBUG_PRINT("info",("spider result_list.internal_limit=%lld",
+    result_list.internal_limit));
+  DBUG_PRINT("info",("spider result_list.split_read=%lld",
+    result_list.split_read));
+  DBUG_PRINT("info",("spider result_list.limit_num=%lld",
+    result_list.limit_num));
+  {
+    if (result_list.direct_order_limit)
+    {
+      if ((error_num =
+        append_key_order_for_direct_order_limit_with_alias_sql_part(
+          NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    } else {
+      if ((error_num = append_key_order_with_alias_sql_part(
+        NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    if ((error_num = append_limit_sql_part(
+      result_list.internal_offset,
+      result_list.limit_num,
+      SPIDER_SQL_TYPE_SELECT_SQL)))
+    {
+      DBUG_RETURN(error_num);
+    }
+    if (
+      (error_num = append_select_lock_sql_part(
+        SPIDER_SQL_TYPE_SELECT_SQL))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  int roop_start, roop_end, lock_mode, link_ok;
+  lock_mode = spider_conn_lock_mode(this);
+  if (lock_mode)
+  {
+    /* "for update" or "lock in share mode" */
+    link_ok = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_OK);
+    roop_start = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY);
+    roop_end = share->link_count;
+  } else {
+    link_ok = search_link_idx;
+    roop_start = search_link_idx;
+    roop_end = search_link_idx + 1;
+  }
+  for (roop_count = roop_start; roop_count < roop_end;
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, roop_count, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY)
+  ) {
+    if (result_list.bgs_phase > 0)
+    {
+      if ((error_num = spider_check_and_init_casual_read(
+        wide_handler->trx->thd, this,
+        roop_count)))
+        DBUG_RETURN(error_num);
+      if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+        TRUE, FALSE, (roop_count != link_ok))))
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          share->monitoring_kind[roop_count] &&
+          need_mons[roop_count]
+        ) {
+          error_num = spider_ping_table_mon_from_table(
+              wide_handler->trx,
+              wide_handler->trx->thd,
+              share,
+              roop_count,
+              (uint32) share->monitoring_sid[roop_count],
+              share->table_name,
+              share->table_name_length,
+              conn_link_idx[roop_count],
+              NULL,
+              0,
+              share->monitoring_kind[roop_count],
+              share->monitoring_limit[roop_count],
+              share->monitoring_flag[roop_count],
+              TRUE
+            );
+        }
+        DBUG_RETURN(check_error_mode_eof(error_num));
+      }
+    } else {
+      ulong sql_type;
+      conn= conns[roop_count];
+      sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+      spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+      pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+      if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+      DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+        conn->need_mon = &need_mons[roop_count];
+        DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = TRUE;
+        conn->mta_conn_mutex_unlock_later = TRUE;
+        if ((error_num = spider_db_set_names(this, conn,
+          roop_count)))
+        {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        spider_conn_set_timeout_from_share(conn, roop_count,
+          wide_handler->trx->thd, share);
+        if (dbton_hdl->execute_sql(
+          sql_type,
+          conn,
+          result_list.quick_mode,
+          &need_mons[roop_count])
+        ) {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          error_num = spider_db_errorno(conn);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        connection_ids[roop_count] = conn->connection_id;
+        DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = FALSE;
+        conn->mta_conn_mutex_unlock_later = FALSE;
+        if (roop_count == link_ok)
+        {
+          if ((error_num = spider_db_store_result(this, roop_count, table)))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          result_link_idx = link_ok;
+        } else {
+          spider_db_discard_result(this, roop_count, conn);
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+        }
+    }
+  }
+  if (buf && (error_num = spider_db_fetch(buf, this, table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_index_read_map(
+  const uchar *key,
+  key_part_map keypart_map,
+  enum ha_rkey_function find_flag,
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_index_read_map");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      index_read_map_internal(NULL, key, keypart_map, find_flag);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_read_map(
+  uchar *buf,
+  const uchar *key,
+  key_part_map keypart_map,
+  enum ha_rkey_function find_flag
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::index_read_map");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+    if (
+      result_list.sorted &&
+      result_list.desc_flg
+    ) {
+      DBUG_RETURN(index_prev(buf));
+    }
+    DBUG_RETURN(index_next(buf));
+  }
+  DBUG_RETURN(index_read_map_internal(buf, key, keypart_map, find_flag));
+}
+
+int ha_spider::index_read_last_map_internal(
+  uchar *buf,
+  const uchar *key,
+  key_part_map keypart_map
+) {
+  int error_num;
+  key_range start_key;
+  SPIDER_CONN *conn;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_read_last_map_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  do_direct_update = FALSE;
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+/*
+  spider_db_free_one_result_for_start_next(this);
+*/
+  if (
+      result_list.current
+    &&
+    (error_num = spider_db_free_result(this, FALSE))
+  )
+    DBUG_RETURN(error_num);
+
+  check_direct_order_limit();
+  start_key.key = key;
+  start_key.keypart_map = keypart_map;
+  start_key.flag = HA_READ_KEY_EXACT;
+  if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+    DBUG_RETURN(error_num);
+  if ((error_num = spider_set_conn_bg_param(this)))
+    DBUG_RETURN(error_num);
+  check_select_column(FALSE);
+  DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+  result_list.finish_flg = FALSE;
+  result_list.record_num = 0;
+  if (wide_handler->keyread)
+    result_list.keyread = TRUE;
+  else
+    result_list.keyread = FALSE;
+  if (
+    (error_num = spider_db_append_select(this)) ||
+    (error_num = spider_db_append_select_columns(this))
+  )
+    DBUG_RETURN(error_num);
+  if (
+    share->key_hint &&
+    (error_num = append_hint_after_table_sql_part(
+      SPIDER_SQL_TYPE_SELECT_SQL))
+  )
+    DBUG_RETURN(error_num);
+  set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+  result_list.desc_flg = TRUE;
+  result_list.sorted = TRUE;
+  result_list.key_info = &table->key_info[active_index];
+  check_distinct_key_query();
+  result_list.limit_num =
+    result_list.internal_limit >= result_list.split_read ?
+    result_list.split_read : result_list.internal_limit;
+  if (
+    (error_num = spider_db_append_key_where(
+      &start_key, NULL, this))
+  )
+    DBUG_RETURN(error_num);
+  {
+    if (result_list.direct_order_limit)
+    {
+      if ((error_num =
+        append_key_order_for_direct_order_limit_with_alias_sql_part(
+          NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    } else {
+      if ((error_num = append_key_order_with_alias_sql_part(
+        NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    if ((error_num = append_limit_sql_part(
+      result_list.internal_offset,
+      result_list.limit_num,
+      SPIDER_SQL_TYPE_SELECT_SQL)))
+    {
+      DBUG_RETURN(error_num);
+    }
+    if (
+      (error_num = append_select_lock_sql_part(
+        SPIDER_SQL_TYPE_SELECT_SQL))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+  tmp_lock_mode = spider_conn_lock_mode(this);
+  if (tmp_lock_mode)
+  {
+    /* "for update" or "lock in share mode" */
+    link_ok = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_OK);
+    roop_start = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY);
+    roop_end = share->link_count;
+  } else {
+    link_ok = search_link_idx;
+    roop_start = search_link_idx;
+    roop_end = search_link_idx + 1;
+  }
+  for (roop_count = roop_start; roop_count < roop_end;
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, roop_count, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY)
+  ) {
+    if (result_list.bgs_phase > 0)
+    {
+      if ((error_num = spider_check_and_init_casual_read(
+        wide_handler->trx->thd, this,
+        roop_count)))
+        DBUG_RETURN(error_num);
+      if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+        TRUE, FALSE, (roop_count != link_ok))))
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          share->monitoring_kind[roop_count] &&
+          need_mons[roop_count]
+        ) {
+          error_num = spider_ping_table_mon_from_table(
+              wide_handler->trx,
+              wide_handler->trx->thd,
+              share,
+              roop_count,
+              (uint32) share->monitoring_sid[roop_count],
+              share->table_name,
+              share->table_name_length,
+              conn_link_idx[roop_count],
+              NULL,
+              0,
+              share->monitoring_kind[roop_count],
+              share->monitoring_limit[roop_count],
+              share->monitoring_flag[roop_count],
+              TRUE
+            );
+        }
+        DBUG_RETURN(check_error_mode_eof(error_num));
+      }
+    } else {
+      ulong sql_type;
+      conn= conns[roop_count];
+      sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+      spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+      pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+      if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+      DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+        conn->need_mon = &need_mons[roop_count];
+        DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = TRUE;
+        conn->mta_conn_mutex_unlock_later = TRUE;
+        if ((error_num = spider_db_set_names(this, conn,
+          roop_count)))
+        {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        spider_conn_set_timeout_from_share(conn, roop_count,
+          wide_handler->trx->thd, share);
+        if (dbton_hdl->execute_sql(
+          sql_type,
+          conn,
+          result_list.quick_mode,
+          &need_mons[roop_count])
+        ) {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          error_num = spider_db_errorno(conn);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        connection_ids[roop_count] = conn->connection_id;
+        DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = FALSE;
+        conn->mta_conn_mutex_unlock_later = FALSE;
+        if (roop_count == link_ok)
+        {
+          if ((error_num = spider_db_store_result(this, roop_count, table)))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          result_link_idx = link_ok;
+        } else {
+          spider_db_discard_result(this, roop_count, conn);
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+        }
+    }
+  }
+  if (buf && (error_num = spider_db_fetch(buf, this, table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_index_read_last_map(
+  const uchar *key,
+  key_part_map keypart_map,
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_index_read_last_map");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      index_read_last_map_internal(NULL, key, keypart_map);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_read_last_map(
+  uchar *buf,
+  const uchar *key,
+  key_part_map keypart_map
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::index_read_last_map");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+    DBUG_RETURN(index_prev(buf));
+  }
+  DBUG_RETURN(index_read_last_map_internal(buf, key, keypart_map));
+}
+
+int ha_spider::index_next(
+  uchar *buf
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  if (
+    result_list.sorted &&
+    result_list.desc_flg
+  ) {
+    if ((error_num = spider_db_seek_prev(buf, this, table)))
+      DBUG_RETURN(check_error_mode_eof(error_num));
+    DBUG_RETURN(0);
+  }
+  if ((error_num = spider_db_seek_next(buf, this, search_link_idx, table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_prev(
+  uchar *buf
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_prev");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  if (
+    result_list.sorted &&
+    result_list.desc_flg
+  ) {
+    if ((error_num = spider_db_seek_next(buf, this, search_link_idx, table)))
+      DBUG_RETURN(check_error_mode_eof(error_num));
+    DBUG_RETURN(0);
+  }
+  if ((error_num = spider_db_seek_prev(buf, this, table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_first_internal(
+  uchar *buf
+) {
+  int error_num;
+  SPIDER_CONN *conn;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_first_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  do_direct_update = FALSE;
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  {
+    /*
+        spider_db_free_one_result_for_start_next(this);
+    */
+    if ((error_num = spider_db_free_result(this, FALSE)))
+      DBUG_RETURN(error_num);
+    if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+      DBUG_RETURN(error_num);
+
+    check_direct_order_limit();
+    if ((error_num = spider_set_conn_bg_param(this)))
+      DBUG_RETURN(error_num);
+    check_select_column(FALSE);
+    DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+    result_list.finish_flg = FALSE;
+    result_list.record_num = 0;
+    if (wide_handler->keyread)
+      result_list.keyread = TRUE;
+    else
+      result_list.keyread = FALSE;
+    if (
+      (error_num = spider_db_append_select(this)) ||
+      (error_num = spider_db_append_select_columns(this))
+    )
+      DBUG_RETURN(error_num);
+    if (
+      share->key_hint &&
+      (error_num = append_hint_after_table_sql_part(
+        SPIDER_SQL_TYPE_SELECT_SQL))
+    )
+      DBUG_RETURN(error_num);
+    set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+    result_list.desc_flg = FALSE;
+    result_list.sorted = TRUE;
+    result_list.key_info = &table->key_info[active_index];
+    result_list.key_order = 0;
+    check_distinct_key_query();
+    result_list.limit_num =
+      result_list.internal_limit >= result_list.split_read ?
+      result_list.split_read : result_list.internal_limit;
+    if (
+      (error_num = spider_db_append_key_where(
+        NULL, NULL, this))
+    )
+      DBUG_RETURN(error_num);
+    {
+      if (result_list.direct_order_limit)
+      {
+        if ((error_num =
+          append_key_order_for_direct_order_limit_with_alias_sql_part(
+            NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+          DBUG_RETURN(error_num);
+      } else {
+        if ((error_num = append_key_order_with_alias_sql_part(
+          NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+          DBUG_RETURN(error_num);
+      }
+      if ((error_num = append_limit_sql_part(
+        result_list.internal_offset,
+        result_list.limit_num,
+        SPIDER_SQL_TYPE_SELECT_SQL)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      if (
+        (error_num = append_select_lock_sql_part(
+          SPIDER_SQL_TYPE_SELECT_SQL))
+      ) {
+        DBUG_RETURN(error_num);
+      }
+    }
+
+    int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+    tmp_lock_mode = spider_conn_lock_mode(this);
+    if (tmp_lock_mode)
+    {
+      /* "for update" or "lock in share mode" */
+      link_ok = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_OK);
+      roop_start = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_end = share->link_count;
+    } else {
+      link_ok = search_link_idx;
+      roop_start = search_link_idx;
+      roop_end = search_link_idx + 1;
+    }
+    for (roop_count = roop_start; roop_count < roop_end;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (result_list.bgs_phase > 0)
+      {
+        if ((error_num = spider_check_and_init_casual_read(
+          wide_handler->trx->thd, this,
+          roop_count)))
+          DBUG_RETURN(error_num);
+        if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+          TRUE, FALSE, (roop_count != link_ok))))
+        {
+          if (
+            error_num != HA_ERR_END_OF_FILE &&
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+      } else {
+        ulong sql_type;
+        conn= conns[roop_count];
+        sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+        spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+        pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+        if ((error_num =
+          dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+          conn->need_mon = &need_mons[roop_count];
+          DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = TRUE;
+          conn->mta_conn_mutex_unlock_later = TRUE;
+          if ((error_num = spider_db_set_names(this, conn,
+            roop_count)))
+          {
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+            pthread_mutex_unlock(&conn->mta_conn_mutex);
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          spider_conn_set_timeout_from_share(conn, roop_count,
+            wide_handler->trx->thd, share);
+          if (dbton_hdl->execute_sql(
+            sql_type,
+            conn,
+            result_list.quick_mode,
+            &need_mons[roop_count])
+          ) {
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            error_num = spider_db_errorno(conn);
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          connection_ids[roop_count] = conn->connection_id;
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          if (roop_count == link_ok)
+          {
+            if ((error_num = spider_db_store_result(this, roop_count, table)))
+            {
+              if (
+                error_num != HA_ERR_END_OF_FILE &&
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+              DBUG_RETURN(check_error_mode_eof(error_num));
+            }
+            result_link_idx = link_ok;
+          } else {
+            spider_db_discard_result(this, roop_count, conn);
+            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+            pthread_mutex_unlock(&conn->mta_conn_mutex);
+          }
+      }
+    }
+  }
+
+  if (buf)
+  {
+    if (
+      result_list.sorted &&
+      result_list.desc_flg
+    ) {
+      if ((error_num = spider_db_seek_last(buf, this, search_link_idx, table)))
+        DBUG_RETURN(check_error_mode_eof(error_num));
+      DBUG_RETURN(0);
+    }
+    if ((error_num = spider_db_seek_first(buf, this, table)))
+      DBUG_RETURN(check_error_mode_eof(error_num));
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_index_first(
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_index_first");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      index_first_internal(NULL);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_first(
+  uchar *buf
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::index_first");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+    DBUG_RETURN(index_next(buf));
+  }
+  DBUG_RETURN(index_first_internal(buf));
+}
+
+int ha_spider::index_last_internal(
+  uchar *buf
+) {
+  int error_num;
+  SPIDER_CONN *conn;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_last_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  do_direct_update = FALSE;
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  {
+    /*
+        spider_db_free_one_result_for_start_next(this);
+    */
+    if ((error_num = spider_db_free_result(this, FALSE)))
+      DBUG_RETURN(error_num);
+    if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+      DBUG_RETURN(error_num);
+
+    check_direct_order_limit();
+    if ((error_num = spider_set_conn_bg_param(this)))
+      DBUG_RETURN(error_num);
+    check_select_column(FALSE);
+    DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+    result_list.finish_flg = FALSE;
+    result_list.record_num = 0;
+    if (wide_handler->keyread)
+      result_list.keyread = TRUE;
+    else
+      result_list.keyread = FALSE;
+    if (
+      (error_num = spider_db_append_select(this)) ||
+      (error_num = spider_db_append_select_columns(this))
+    )
+      DBUG_RETURN(error_num);
+    if (
+      share->key_hint &&
+      (error_num = append_hint_after_table_sql_part(
+        SPIDER_SQL_TYPE_SELECT_SQL))
+    )
+      DBUG_RETURN(error_num);
+    set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+    result_list.desc_flg = TRUE;
+    result_list.sorted = TRUE;
+    result_list.key_info = &table->key_info[active_index];
+    result_list.key_order = 0;
+    check_distinct_key_query();
+    result_list.limit_num =
+      result_list.internal_limit >= result_list.split_read ?
+      result_list.split_read : result_list.internal_limit;
+    if (
+      (error_num = spider_db_append_key_where(
+        NULL, NULL, this))
+    )
+      DBUG_RETURN(error_num);
+    {
+      if (result_list.direct_order_limit)
+      {
+        if ((error_num =
+          append_key_order_for_direct_order_limit_with_alias_sql_part(
+            NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+          DBUG_RETURN(error_num);
+      } else {
+        if ((error_num = append_key_order_with_alias_sql_part(
+          NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+          DBUG_RETURN(error_num);
+      }
+      if ((error_num = append_limit_sql_part(
+        result_list.internal_offset,
+        result_list.limit_num,
+        SPIDER_SQL_TYPE_SELECT_SQL)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      if (
+        (error_num = append_select_lock_sql_part(
+          SPIDER_SQL_TYPE_SELECT_SQL))
+      ) {
+        DBUG_RETURN(error_num);
+      }
+    }
+
+    int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+    tmp_lock_mode = spider_conn_lock_mode(this);
+    if (tmp_lock_mode)
+    {
+      /* "for update" or "lock in share mode" */
+      link_ok = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_OK);
+      roop_start = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_end = share->link_count;
+    } else {
+      link_ok = search_link_idx;
+      roop_start = search_link_idx;
+      roop_end = search_link_idx + 1;
+    }
+    for (roop_count = roop_start; roop_count < roop_end;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (result_list.bgs_phase > 0)
+      {
+        if ((error_num = spider_check_and_init_casual_read(
+          wide_handler->trx->thd, this,
+          roop_count)))
+          DBUG_RETURN(error_num);
+        if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+          TRUE, FALSE, (roop_count != link_ok))))
+        {
+          if (
+            error_num != HA_ERR_END_OF_FILE &&
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+      } else {
+        ulong sql_type;
+        conn= conns[roop_count];
+        sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+        spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+        pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+        if ((error_num =
+          dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+          conn->need_mon = &need_mons[roop_count];
+          DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = TRUE;
+          conn->mta_conn_mutex_unlock_later = TRUE;
+          if ((error_num = spider_db_set_names(this, conn,
+            roop_count)))
+          {
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+            pthread_mutex_unlock(&conn->mta_conn_mutex);
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          spider_conn_set_timeout_from_share(conn, roop_count,
+            wide_handler->trx->thd, share);
+          if (dbton_hdl->execute_sql(
+            sql_type,
+            conn,
+            result_list.quick_mode,
+            &need_mons[roop_count])
+          ) {
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            error_num = spider_db_errorno(conn);
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          connection_ids[roop_count] = conn->connection_id;
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          if (roop_count == link_ok)
+          {
+            if ((error_num = spider_db_store_result(this, roop_count, table)))
+            {
+              if (
+                error_num != HA_ERR_END_OF_FILE &&
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+              DBUG_RETURN(check_error_mode_eof(error_num));
+            }
+            result_link_idx = link_ok;
+          } else {
+            spider_db_discard_result(this, roop_count, conn);
+            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+            pthread_mutex_unlock(&conn->mta_conn_mutex);
+          }
+      }
+    }
+  }
+
+  if (buf)
+  {
+    if (
+      result_list.sorted &&
+      result_list.desc_flg
+    ) {
+      if ((error_num = spider_db_seek_first(buf, this, table)))
+        DBUG_RETURN(check_error_mode_eof(error_num));
+      DBUG_RETURN(0);
+    }
+    if ((error_num = spider_db_seek_last(buf, this, search_link_idx, table)))
+      DBUG_RETURN(check_error_mode_eof(error_num));
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_index_last(
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_index_last");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      index_last_internal(NULL);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::index_last(
+  uchar *buf
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::index_last");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+    DBUG_RETURN(index_prev(buf));
+  }
+  DBUG_RETURN(index_last_internal(buf));
+}
+
+int ha_spider::index_next_same(
+  uchar *buf,
+  const uchar *key,
+  uint keylen
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::index_next_same");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  if (
+    result_list.sorted &&
+    result_list.desc_flg
+  ) {
+    if ((error_num = spider_db_seek_prev(buf, this, table)))
+      DBUG_RETURN(check_error_mode_eof(error_num));
+    DBUG_RETURN(0);
+  }
+  if ((error_num = spider_db_seek_next(buf, this, search_link_idx, table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::read_range_first_internal(
+  uchar *buf,
+  const key_range *start_key,
+  const key_range *end_key,
+  bool eq_range,
+  bool sorted
+) {
+  int error_num;
+  SPIDER_CONN *conn;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::read_range_first_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  do_direct_update = FALSE;
+  if (
+    start_key &&
+    start_key->flag >= HA_READ_MBR_CONTAIN &&
+    start_key->flag <= HA_READ_MBR_EQUAL
+  )
+    use_spatial_index = TRUE;
+
+  if (end_key)
+  {
+    key_compare_result_on_equal =
+      ((end_key->flag == HA_READ_BEFORE_KEY) ? 1 :
+      (end_key->flag == HA_READ_AFTER_KEY) ? -1 : 0);
+  }
+  range_key_part = table->key_info[active_index].key_part;
+
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  spider_db_free_one_result_for_start_next(this);
+  check_direct_order_limit();
+  if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+    DBUG_RETURN(error_num);
+  if ((error_num = spider_set_conn_bg_param(this)))
+    DBUG_RETURN(error_num);
+  check_select_column(FALSE);
+  DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+  result_list.finish_flg = FALSE;
+  result_list.record_num = 0;
+  if (wide_handler->keyread)
+    result_list.keyread = TRUE;
+  else
+    result_list.keyread = FALSE;
+  if (
+    (error_num = spider_db_append_select(this)) ||
+    (error_num = spider_db_append_select_columns(this))
+  )
+    DBUG_RETURN(error_num);
+  if (
+    share->key_hint &&
+    (error_num = append_hint_after_table_sql_part(
+      SPIDER_SQL_TYPE_SELECT_SQL))
+  )
+    DBUG_RETURN(error_num);
+  set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+  result_list.desc_flg = FALSE;
+  result_list.sorted = sorted;
+  result_list.key_info = &table->key_info[active_index];
+  check_distinct_key_query();
+  result_list.limit_num =
+    result_list.internal_limit >= result_list.split_read ?
+    result_list.split_read : result_list.internal_limit;
+  DBUG_PRINT("info",("spider limit_num=%lld", result_list.limit_num));
+  if (
+    (error_num = spider_db_append_key_where(
+      start_key, eq_range ? NULL : end_key, this))
+  )
+    DBUG_RETURN(error_num);
+  {
+    if (result_list.direct_order_limit)
+    {
+      if ((error_num =
+        append_key_order_for_direct_order_limit_with_alias_sql_part(
+          NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    } else {
+      if ((error_num = append_key_order_with_alias_sql_part(
+        NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    if ((error_num = append_limit_sql_part(
+      result_list.internal_offset,
+      result_list.limit_num,
+      SPIDER_SQL_TYPE_SELECT_SQL)))
+    {
+      DBUG_RETURN(error_num);
+    }
+    if (
+      (error_num = append_select_lock_sql_part(
+        SPIDER_SQL_TYPE_SELECT_SQL))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+  tmp_lock_mode = spider_conn_lock_mode(this);
+  if (tmp_lock_mode)
+  {
+    /* "for update" or "lock in share mode" */
+    link_ok = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_OK);
+    roop_start = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY);
+    roop_end = share->link_count;
+  } else {
+    link_ok = search_link_idx;
+    roop_start = search_link_idx;
+    roop_end = search_link_idx + 1;
+  }
+  for (roop_count = roop_start; roop_count < roop_end;
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, roop_count, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY)
+  ) {
+    if (result_list.bgs_phase > 0)
+    {
+      if ((error_num = spider_check_and_init_casual_read(
+        wide_handler->trx->thd, this,
+        roop_count)))
+        DBUG_RETURN(error_num);
+      if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+        TRUE, FALSE, (roop_count != link_ok))))
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          share->monitoring_kind[roop_count] &&
+          need_mons[roop_count]
+        ) {
+          error_num = spider_ping_table_mon_from_table(
+              wide_handler->trx,
+              wide_handler->trx->thd,
+              share,
+              roop_count,
+              (uint32) share->monitoring_sid[roop_count],
+              share->table_name,
+              share->table_name_length,
+              conn_link_idx[roop_count],
+              NULL,
+              0,
+              share->monitoring_kind[roop_count],
+              share->monitoring_limit[roop_count],
+              share->monitoring_flag[roop_count],
+              TRUE
+            );
+        }
+        DBUG_RETURN(check_error_mode_eof(error_num));
+      }
+    } else {
+      ulong sql_type;
+      conn= conns[roop_count];
+      sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+      spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+      pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+      if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+      DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+        conn->need_mon = &need_mons[roop_count];
+        DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = TRUE;
+        conn->mta_conn_mutex_unlock_later = TRUE;
+        if ((error_num = spider_db_set_names(this, conn,
+          roop_count)))
+        {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        spider_conn_set_timeout_from_share(conn, roop_count,
+          wide_handler->trx->thd, share);
+        if (dbton_hdl->execute_sql(
+          sql_type,
+          conn,
+          result_list.quick_mode,
+          &need_mons[roop_count])
+        ) {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          error_num = spider_db_errorno(conn);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        connection_ids[roop_count] = conn->connection_id;
+        DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = FALSE;
+        conn->mta_conn_mutex_unlock_later = FALSE;
+        if (roop_count == link_ok)
+        {
+          if ((error_num = spider_db_store_result(this, roop_count, table)))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          result_link_idx = link_ok;
+        } else {
+          spider_db_discard_result(this, roop_count, conn);
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+        }
+    }
+  }
+  if (buf && (error_num = spider_db_fetch(buf, this, table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_read_range_first(
+  const key_range *start_key,
+  const key_range *end_key,
+  bool eq_range,
+  bool sorted,
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_read_range_first");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      read_range_first_internal(NULL, start_key, end_key, eq_range, sorted);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::read_range_first(
+  const key_range *start_key,
+  const key_range *end_key,
+  bool eq_range,
+  bool sorted
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::read_range_first");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+    if ((error_num = read_range_next()))
+      DBUG_RETURN(error_num);
+    DBUG_RETURN(0);
+  }
+  if ((error_num = read_range_first_internal(table->record[0], start_key,
+    end_key, eq_range, sorted)))
+    DBUG_RETURN(error_num);
+  DBUG_RETURN(0);
+}
+
+int ha_spider::read_range_next()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::read_range_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  if (
+    result_list.sorted &&
+    result_list.desc_flg
+  ) {
+    if ((error_num = spider_db_seek_prev(table->record[0], this, table)))
+      DBUG_RETURN(check_error_mode_eof(error_num));
+    DBUG_RETURN(0);
+  }
+  if ((error_num = spider_db_seek_next(table->record[0], this, search_link_idx,
+    table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+void ha_spider::reset_no_where_cond()
+{
+  uint roop_count;
+  DBUG_ENTER("ha_spider::reset_no_where_cond");
+    for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+    {
+      dbton_handler[share->use_sql_dbton_ids[roop_count]]->no_where_cond =
+        FALSE;
+    }
+  DBUG_VOID_RETURN;
+}
+
+bool ha_spider::check_no_where_cond()
+{
+  uint roop_count;
+  DBUG_ENTER("ha_spider::check_no_where_cond");
+    for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+    {
+      if (dbton_handler[share->use_sql_dbton_ids[roop_count]]->no_where_cond)
+      {
+        DBUG_RETURN(TRUE);
+      }
+    }
+  DBUG_RETURN(FALSE);
+}
+
+ha_rows ha_spider::multi_range_read_info_const(
+  uint keyno,
+  RANGE_SEQ_IF *seq,
+  void *seq_init_param,
+  uint n_ranges,
+  uint *bufsz,
+  uint *flags,
+  Cost_estimate *cost
+)
+{
+  DBUG_ENTER("ha_spider::multi_range_read_info_const");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!pre_bitmap_checked)
+  {
+    if (wide_handler->external_lock_type == F_WRLCK)
+    {
+      pk_update = FALSE;
+      if (
+        wide_handler->update_request &&
+        share->have_recovery_link &&
+        (pk_update = spider_check_pk_update(table))
+      ) {
+        bitmap_set_all(table->read_set);
+        if (is_clone)
+          memset(wide_handler->searched_bitmap, 0xFF,
+            no_bytes_in_map(table->read_set));
+      }
+    }
+
+    if (!is_clone)
+      set_select_column_mode();
+
+    pre_bitmap_checked = TRUE;
+  }
+/*
+  multi_range_num = n_ranges;
+  mrr_have_range = FALSE;
+*/
+  ha_rows rows =
+    handler::multi_range_read_info_const(
+      keyno,
+      seq,
+      seq_init_param,
+      n_ranges,
+      bufsz,
+      flags,
+      cost
+    );
+  *flags &= ~HA_MRR_USE_DEFAULT_IMPL;
+  DBUG_PRINT("info",("spider rows=%llu", rows));
+  DBUG_RETURN(rows);
+}
+
+ha_rows ha_spider::multi_range_read_info(
+  uint keyno,
+  uint n_ranges,
+  uint keys,
+  uint key_parts,
+  uint *bufsz,
+  uint *flags,
+  Cost_estimate *cost
+)
+{
+  DBUG_ENTER("ha_spider::multi_range_read_info");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!pre_bitmap_checked)
+  {
+    if (wide_handler->external_lock_type == F_WRLCK)
+    {
+      pk_update = FALSE;
+      if (
+        wide_handler->update_request &&
+        share->have_recovery_link &&
+        (pk_update = spider_check_pk_update(table))
+      ) {
+        bitmap_set_all(table->read_set);
+        if (is_clone)
+          memset(wide_handler->searched_bitmap, 0xFF,
+            no_bytes_in_map(table->read_set));
+      }
+    }
+
+    if (!is_clone)
+      set_select_column_mode();
+
+    pre_bitmap_checked = TRUE;
+  }
+/*
+  multi_range_num = n_ranges;
+  mrr_have_range = FALSE;
+*/
+  ha_rows rows =
+    handler::multi_range_read_info(
+      keyno,
+      n_ranges,
+      keys,
+      key_parts,
+      bufsz,
+      flags,
+      cost
+    );
+  *flags &= ~HA_MRR_USE_DEFAULT_IMPL;
+  DBUG_PRINT("info",("spider rows=%llu", rows));
+  DBUG_RETURN(rows);
+}
+
+int ha_spider::multi_range_read_init(
+  RANGE_SEQ_IF *seq,
+  void *seq_init_param,
+  uint n_ranges,
+  uint mode,
+  HANDLER_BUFFER *buf
+) {
+  bka_mode = spider_param_bka_mode(wide_handler->trx->thd, share->bka_mode);
+  backup_error_status();
+  DBUG_ENTER("ha_spider::multi_range_read_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider n_ranges=%u", n_ranges));
+  multi_range_num = n_ranges;
+  mrr_have_range = FALSE;
+  reset_no_where_cond();
+  DBUG_RETURN(
+    handler::multi_range_read_init(
+      seq,
+      seq_init_param,
+      n_ranges,
+      mode,
+      buf
+    )
+  );
+}
+
+int ha_spider::multi_range_read_next_first(
+  range_id_t *range_info
+)
+{
+  int error_num, roop_count;
+  SPIDER_CONN *conn;
+  int range_res;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::multi_range_read_next_first");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  do_direct_update = FALSE;
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+
+  spider_db_free_one_result_for_start_next(this);
+  check_direct_order_limit();
+  if ((error_num = spider_set_conn_bg_param(this)))
+    DBUG_RETURN(error_num);
+  check_select_column(FALSE);
+  DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+  result_list.finish_flg = FALSE;
+  result_list.record_num = 0;
+  if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+    DBUG_RETURN(error_num);
+  result_list.desc_flg = FALSE;
+  result_list.sorted = mrr_is_output_sorted;
+  result_list.key_info = &table->key_info[active_index];
+  if (multi_range_num == 1 || result_list.multi_split_read <= 1)
+  {
+    if (wide_handler->keyread)
+      result_list.keyread = TRUE;
+    else
+      result_list.keyread = FALSE;
+    mrr_with_cnt = FALSE;
+    if (
+      (error_num = spider_db_append_select(this)) ||
+      (error_num = spider_db_append_select_columns(this))
+    )
+      DBUG_RETURN(error_num);
+    if (
+      share->key_hint &&
+      (error_num = append_hint_after_table_sql_part(
+        SPIDER_SQL_TYPE_SELECT_SQL))
+    )
+      DBUG_RETURN(error_num);
+    set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+    error_num = HA_ERR_END_OF_FILE;
+    while (!(range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range)))
+    {
+      DBUG_PRINT("info",("spider range_res1=%d", range_res));
+      result_list.limit_num =
+        result_list.internal_limit - result_list.record_num >=
+        result_list.split_read ?
+        result_list.split_read :
+        result_list.internal_limit - result_list.record_num;
+      DBUG_PRINT("info",("spider limit_num=%lld", result_list.limit_num));
+      if (
+        (error_num = spider_db_append_key_where(
+          &mrr_cur_range.start_key,
+          SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE) ?
+          NULL : &mrr_cur_range.end_key, this))
+      )
+        DBUG_RETURN(error_num);
+      {
+        if (result_list.direct_order_limit)
+        {
+          if ((error_num =
+            append_key_order_for_direct_order_limit_with_alias_sql_part(
+              NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        } else {
+          if ((error_num = append_key_order_with_alias_sql_part(
+            NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        if ((error_num = append_limit_sql_part(
+          result_list.internal_offset + result_list.record_num,
+          result_list.limit_num,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        if (
+          (error_num = append_select_lock_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL))
+        ) {
+          DBUG_RETURN(error_num);
+        }
+      }
+
+      int roop_start, roop_end, tmp_lock_mode, link_ok;
+      tmp_lock_mode = spider_conn_lock_mode(this);
+      if (tmp_lock_mode)
+      {
+        /* "for update" or "lock in share mode" */
+        link_ok = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_OK);
+        roop_start = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY);
+        roop_end = share->link_count;
+      } else {
+        link_ok = search_link_idx;
+        roop_start = search_link_idx;
+        roop_end = search_link_idx + 1;
+      }
+      for (roop_count = roop_start; roop_count < roop_end;
+        roop_count = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, roop_count, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY)
+      ) {
+        if (result_list.bgs_phase > 0)
+        {
+          if ((error_num = spider_check_and_init_casual_read(
+            wide_handler->trx->thd, this,
+            roop_count)))
+            DBUG_RETURN(error_num);
+          error_num = spider_bg_conn_search(this, roop_count, roop_start,
+            TRUE, FALSE, (roop_count != link_ok));
+          if (
+            error_num &&
+            error_num != HA_ERR_END_OF_FILE &&
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+        } else {
+          ulong sql_type;
+          conn= conns[roop_count];
+          sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+          spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+          pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+          if ((error_num =
+            dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+          {
+            DBUG_RETURN(error_num);
+          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+            conn->need_mon = &need_mons[roop_count];
+            DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = TRUE;
+            conn->mta_conn_mutex_unlock_later = TRUE;
+            if ((error_num = spider_db_set_names(this, conn,
+              roop_count)))
+            {
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+              pthread_mutex_unlock(&conn->mta_conn_mutex);
+              if (
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+            }
+            if (!error_num)
+            {
+              spider_conn_set_timeout_from_share(conn, roop_count,
+                wide_handler->trx->thd, share);
+              if (dbton_hdl->execute_sql(
+                sql_type,
+                conn,
+                result_list.quick_mode,
+                &need_mons[roop_count])
+              ) {
+                DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+                DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+                conn->mta_conn_mutex_lock_already = FALSE;
+                conn->mta_conn_mutex_unlock_later = FALSE;
+                error_num = spider_db_errorno(conn);
+                if (
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+              }
+            }
+            if (!error_num)
+            {
+              connection_ids[roop_count] = conn->connection_id;
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              if (roop_count == link_ok)
+              {
+                error_num = spider_db_store_result(this, roop_count, table);
+                if (
+                  error_num &&
+                  error_num != HA_ERR_END_OF_FILE &&
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+                result_link_idx = link_ok;
+              } else {
+                spider_db_discard_result(this, roop_count, conn);
+                SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+                pthread_mutex_unlock(&conn->mta_conn_mutex);
+              }
+            }
+        }
+        if (error_num)
+          break;
+      }
+      if (error_num)
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          check_error_mode(error_num)
+        )
+          DBUG_RETURN(error_num);
+        DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+        result_list.finish_flg = FALSE;
+        result_list.record_num = 0;
+        if (result_list.current)
+        {
+          DBUG_PRINT("info",
+            ("spider result_list.current->finish_flg = FALSE"));
+          result_list.current->finish_flg = FALSE;
+          spider_db_free_one_result(&result_list,
+            (SPIDER_RESULT *) result_list.current);
+          if (result_list.current == result_list.first)
+            result_list.current = NULL;
+          else
+            result_list.current = result_list.current->prev;
+        }
+      } else {
+        if (!range_info)
+          DBUG_RETURN(0);
+        if (!(error_num = spider_db_fetch(table->record[0], this, table)))
+        {
+          *range_info = (char *) mrr_cur_range.ptr;
+          DBUG_RETURN(0);
+        }
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          check_error_mode(error_num)
+        )
+          DBUG_RETURN(error_num);
+        DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+        result_list.finish_flg = FALSE;
+        result_list.record_num = 0;
+        if (result_list.current)
+        {
+          DBUG_PRINT("info",
+            ("spider result_list.current->finish_flg = FALSE"));
+          result_list.current->finish_flg = FALSE;
+          spider_db_free_one_result(&result_list,
+            (SPIDER_RESULT *) result_list.current);
+          if (result_list.current == result_list.first)
+            result_list.current = NULL;
+          else
+            result_list.current = result_list.current->prev;
+        }
+      }
+      if (check_no_where_cond())
+      {
+        DBUG_RETURN(check_error_mode_eof(0));
+      }
+      set_where_to_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+    }
+    DBUG_PRINT("info",("spider range_res2=%d", range_res));
+    if (error_num)
+      DBUG_RETURN(check_error_mode_eof(error_num));
+  } else {
+    bool tmp_high_priority = wide_handler->high_priority;
+    bool have_multi_range;
+    const uchar *first_mrr_start_key;
+    const uchar *first_mrr_end_key;
+    uint first_mrr_start_key_length;
+    uint first_mrr_end_key_length;
+    have_second_range = FALSE;
+    if (wide_handler->keyread)
+      result_list.keyread = TRUE;
+    else
+      result_list.keyread = FALSE;
+    mrr_with_cnt = TRUE;
+    multi_range_cnt = 0;
+    multi_range_hit_point = 0;
+    if (multi_range_keys)
+    {
+      DBUG_PRINT("info",("spider free multi_range_keys=%p", multi_range_keys));
+      spider_free(spider_current_trx, multi_range_keys, MYF(0));
+    }
+    if (!(multi_range_keys = (range_id_t *)
+      spider_malloc(spider_current_trx, 1, sizeof(range_id_t) *
+        (multi_range_num < result_list.multi_split_read ?
+          multi_range_num : result_list.multi_split_read), MYF(MY_WME)))
+    )
+      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+    DBUG_PRINT("info",("spider alloc multi_range_keys=%p", multi_range_keys));
+    if (!mrr_key_buff)
+    {
+      if (!(mrr_key_buff = new spider_string[2]))
+      {
+        DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+      }
+      for (roop_count = 0; roop_count < 2; roop_count++)
+        mrr_key_buff[roop_count].init_calc_mem(235);
+    }
+    error_num = 0;
+    if ((range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range)))
+    {
+      DBUG_PRINT("info",("spider range_res3=%d", range_res));
+      DBUG_PRINT("info",("spider result_list.finish_flg = TRUE"));
+      result_list.finish_flg = TRUE;
+      if (result_list.current)
+      {
+        DBUG_PRINT("info",("spider result_list.current->finish_flg = TRUE"));
+        result_list.current->finish_flg = TRUE;
+      }
+      table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(HA_ERR_END_OF_FILE);
+    }
+    DBUG_PRINT("info",("spider range_res4=%d", range_res));
+    mrr_key_buff[0].length(0);
+    first_mrr_start_key = mrr_cur_range.start_key.key;
+    first_mrr_start_key_length = mrr_cur_range.start_key.length;
+    if (first_mrr_start_key_length)
+    {
+      if (mrr_key_buff[0].reserve(first_mrr_start_key_length))
+        DBUG_RETURN(HA_ERR_END_OF_FILE);
+      mrr_key_buff[0].q_append((const char *) first_mrr_start_key,
+        first_mrr_start_key_length);
+      mrr_cur_range.start_key.key = (const uchar *) mrr_key_buff[0].ptr();
+    }
+    mrr_key_buff[1].length(0);
+    first_mrr_end_key = mrr_cur_range.end_key.key;
+    first_mrr_end_key_length = mrr_cur_range.end_key.length;
+    if (first_mrr_end_key_length)
+    {
+      if (mrr_key_buff[1].reserve(first_mrr_end_key_length))
+        DBUG_RETURN(HA_ERR_END_OF_FILE);
+      mrr_key_buff[1].q_append((const char *) first_mrr_end_key,
+        first_mrr_end_key_length);
+      mrr_cur_range.end_key.key = (const uchar *) mrr_key_buff[1].ptr();
+    }
+    result_list.tmp_table_join = FALSE;
+    memset(result_list.tmp_table_join_first, 0, share->link_bitmap_size);
+    do
+    {
+      if ((range_res = mrr_funcs.next(mrr_iter, &mrr_second_range)))
+      {
+        have_second_range = FALSE;
+        have_multi_range = FALSE;
+      } else {
+        have_second_range = TRUE;
+        have_multi_range = TRUE;
+      }
+      DBUG_PRINT("info",("spider range_res5=%d", range_res));
+      result_list.tmp_reuse_sql = FALSE;
+      if (bka_mode &&
+        have_multi_range &&
+        SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE)
+      ) {
+        if (
+          result_list.tmp_table_join &&
+          result_list.tmp_table_join_key_part_map ==
+            mrr_cur_range.start_key.keypart_map
+        ) {
+          /* reuse tmp_sql */
+          result_list.tmp_reuse_sql = TRUE;
+        } else {
+          /* create tmp_sql */
+          result_list.tmp_table_join = TRUE;
+          result_list.tmp_table_join_key_part_map =
+            mrr_cur_range.start_key.keypart_map;
+          if ((error_num = reset_sql_sql(
+            SPIDER_SQL_TYPE_SELECT_SQL | SPIDER_SQL_TYPE_TMP_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        memset(result_list.tmp_table_join_first, 0xFF,
+          share->link_bitmap_size);
+      } else {
+        result_list.tmp_table_join = FALSE;
+      }
+      result_list.tmp_table_join_break_after_get_next = FALSE;
+
+      if (result_list.tmp_table_join)
+      {
+        result_list.limit_num =
+          result_list.internal_limit >= result_list.split_read ?
+          result_list.split_read : result_list.internal_limit;
+        if (bka_mode == 2)
+        {
+          if (!result_list.tmp_reuse_sql)
+          {
+            if ((error_num = append_union_table_and_sql_for_bka(
+              &mrr_cur_range.start_key
+            ))) {
+              DBUG_RETURN(error_num);
+            }
+          } else {
+            if ((error_num = reuse_union_table_and_sql_for_bka()))
+            {
+              DBUG_RETURN(error_num);
+            }
+          }
+        } else {
+          if (!result_list.tmp_reuse_sql)
+          {
+            if ((error_num = append_tmp_table_and_sql_for_bka(
+              &mrr_cur_range.start_key
+            ))) {
+              DBUG_RETURN(error_num);
+            }
+          } else {
+            if ((error_num = reuse_tmp_table_and_sql_for_bka()))
+            {
+              DBUG_RETURN(error_num);
+            }
+          }
+        }
+
+        do
+        {
+          if (
+            !SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE) ||
+            result_list.tmp_table_join_key_part_map !=
+              mrr_cur_range.start_key.keypart_map
+          ) {
+            result_list.tmp_table_join_break_after_get_next = TRUE;
+            break;
+          }
+
+          multi_range_keys[multi_range_cnt] = mrr_cur_range.ptr;
+          if (bka_mode == 2)
+          {
+            if ((error_num = spider_db_append_select(this)))
+              DBUG_RETURN(error_num);
+            if (multi_range_cnt == 0)
+            {
+              if ((error_num = append_multi_range_cnt_with_name_sql_part(
+                SPIDER_SQL_TYPE_SELECT_SQL, multi_range_cnt)))
+                DBUG_RETURN(error_num);
+              if ((error_num = append_key_column_values_with_name_sql_part(
+                &mrr_cur_range.start_key,
+                SPIDER_SQL_TYPE_SELECT_SQL)))
+                DBUG_RETURN(error_num);
+            } else {
+              if ((error_num = append_multi_range_cnt_sql_part(
+                SPIDER_SQL_TYPE_SELECT_SQL, multi_range_cnt, TRUE)))
+                DBUG_RETURN(error_num);
+              if ((error_num = append_key_column_values_sql_part(
+                &mrr_cur_range.start_key,
+                SPIDER_SQL_TYPE_SELECT_SQL)))
+                DBUG_RETURN(error_num);
+            }
+            if ((error_num = append_union_table_connector_sql_part(
+              SPIDER_SQL_TYPE_SELECT_SQL)))
+              DBUG_RETURN(error_num);
+          } else {
+            if ((error_num = append_multi_range_cnt_sql_part(
+              SPIDER_SQL_TYPE_TMP_SQL, multi_range_cnt, TRUE)))
+              DBUG_RETURN(error_num);
+            if ((error_num = append_key_column_values_sql_part(
+              &mrr_cur_range.start_key,
+              SPIDER_SQL_TYPE_TMP_SQL)))
+              DBUG_RETURN(error_num);
+            if ((error_num =
+              append_values_connector_sql_part(SPIDER_SQL_TYPE_TMP_SQL)))
+              DBUG_RETURN(error_num);
+          }
+
+          multi_range_cnt++;
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+            break;
+          if (multi_range_cnt == 1)
+          {
+            if (have_multi_range)
+            {
+              memcpy(&mrr_cur_range, &mrr_second_range,
+                sizeof(KEY_MULTI_RANGE));
+              have_second_range = FALSE;
+              range_res = 0;
+            } else {
+              range_res = 1;
+            }
+          } else {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res6=%d", range_res));
+          }
+        }
+        while (!range_res);
+        if (bka_mode == 2)
+        {
+          if ((error_num = append_union_table_terminator_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        } else {
+          if ((error_num =
+            append_values_terminator_sql_part(SPIDER_SQL_TYPE_TMP_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        result_list.use_union = FALSE;
+
+        if ((error_num = append_limit_sql_part(
+          result_list.internal_offset,
+          result_list.limit_num,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        if (
+          (error_num = append_select_lock_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL))
+        ) {
+          DBUG_RETURN(error_num);
+        }
+      } else {
+        result_list.limit_num = result_list.internal_limit;
+        result_list.split_read = result_list.internal_limit;
+        if (
+          (error_num = init_union_table_name_pos_sql()) ||
+          (error_num = append_union_all_start_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL))
+        )
+          DBUG_RETURN(error_num);
+
+        do
+        {
+          DBUG_PRINT("info",("spider range_res7=%d", range_res));
+          multi_range_keys[multi_range_cnt] = mrr_cur_range.ptr;
+          if ((error_num = spider_db_append_select(this)))
+            DBUG_RETURN(error_num);
+          if ((error_num = append_multi_range_cnt_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL, multi_range_cnt, TRUE)))
+            DBUG_RETURN(error_num);
+          if (
+            (error_num = spider_db_append_select_columns(this)) ||
+            (error_num = set_union_table_name_pos_sql())
+          )
+            DBUG_RETURN(error_num);
+          wide_handler->high_priority = FALSE;
+          if (
+            share->key_hint &&
+            (error_num = append_hint_after_table_sql_part(
+              SPIDER_SQL_TYPE_SELECT_SQL))
+          )
+            DBUG_RETURN(error_num);
+          set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+          DBUG_PRINT("info",("spider internal_offset=%lld",
+            result_list.internal_offset));
+          DBUG_PRINT("info",("spider limit_num=%lld", result_list.limit_num));
+          if (
+            (error_num = spider_db_append_key_where(
+              &mrr_cur_range.start_key,
+              SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE) ?
+              NULL : &mrr_cur_range.end_key, this))
+          )
+            DBUG_RETURN(error_num);
+          if (result_list.direct_order_limit)
+          {
+            if ((error_num =
+              append_key_order_for_direct_order_limit_with_alias_sql_part(
+                NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+              DBUG_RETURN(error_num);
+          } else {
+            if ((error_num = append_key_order_with_alias_sql_part(
+              NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+              DBUG_RETURN(error_num);
+          }
+          if ((error_num = append_limit_sql_part(
+            0,
+            result_list.internal_offset + result_list.limit_num,
+            SPIDER_SQL_TYPE_SELECT_SQL)))
+          {
+            DBUG_RETURN(error_num);
+          }
+          if (
+            (error_num = append_select_lock_sql_part(
+              SPIDER_SQL_TYPE_SELECT_SQL))
+          )
+            DBUG_RETURN(error_num);
+          if ((error_num = append_union_all_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+          multi_range_cnt++;
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+            break;
+          if (multi_range_cnt == 1)
+          {
+            if (have_multi_range)
+            {
+              memcpy(&mrr_cur_range, &mrr_second_range,
+                sizeof(KEY_MULTI_RANGE));
+              have_second_range = FALSE;
+              range_res = 0;
+            } else {
+              range_res = 1;
+            }
+          } else {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res8=%d", range_res));
+          }
+          if (check_no_where_cond())
+          {
+            range_res = 1;
+            break;
+          }
+        }
+        while (!range_res);
+        wide_handler->high_priority = tmp_high_priority;
+        if ((error_num = append_union_all_end_sql_part(
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+          DBUG_RETURN(error_num);
+        result_list.use_union = TRUE;
+
+        bool direct_aggregate_backup = result_list.direct_aggregate;
+        result_list.direct_aggregate = FALSE;
+        if (result_list.direct_order_limit)
+        {
+          if ((error_num =
+            append_key_order_for_direct_order_limit_with_alias_sql_part(
+              NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        } else {
+          if ((error_num = append_key_order_with_alias_sql_part(
+            NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        result_list.direct_aggregate = direct_aggregate_backup;
+        if ((error_num = append_limit_sql_part(
+          result_list.internal_offset,
+          result_list.limit_num,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        {
+          DBUG_RETURN(error_num);
+        }
+      }
+
+      int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+      tmp_lock_mode = spider_conn_lock_mode(this);
+      if (tmp_lock_mode)
+      {
+        /* "for update" or "lock in share mode" */
+        link_ok = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_OK);
+        roop_start = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY);
+        roop_end = share->link_count;
+      } else {
+        link_ok = search_link_idx;
+        roop_start = search_link_idx;
+        roop_end = search_link_idx + 1;
+      }
+
+      for (roop_count = roop_start; roop_count < roop_end;
+        roop_count = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, roop_count, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY)
+      ) {
+        if (result_list.bgs_phase > 0)
+        {
+          if ((error_num = spider_check_and_init_casual_read(
+            wide_handler->trx->thd, this,
+            roop_count)))
+            DBUG_RETURN(error_num);
+          if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+            TRUE, FALSE, (roop_count != link_ok))))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            break;
+          }
+        } else {
+          ulong sql_type;
+          conn= conns[roop_count];
+          sql_type= SPIDER_SQL_TYPE_SELECT_SQL | SPIDER_SQL_TYPE_TMP_SQL;
+          spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+          pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+          if ((error_num =
+            dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+          {
+            DBUG_RETURN(error_num);
+          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          sql_type &= ~SPIDER_SQL_TYPE_TMP_SQL;
+          DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+            conn->need_mon = &need_mons[roop_count];
+            DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = TRUE;
+            conn->mta_conn_mutex_unlock_later = TRUE;
+            if ((error_num = spider_db_set_names(this, conn,
+              roop_count)))
+            {
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+              pthread_mutex_unlock(&conn->mta_conn_mutex);
+              if (
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+              break;
+            }
+            if (
+              result_list.tmp_table_join && bka_mode != 2 &&
+              spider_bit_is_set(result_list.tmp_table_join_first, roop_count)
+            ) {
+              spider_clear_bit(result_list.tmp_table_join_first, roop_count);
+              spider_set_bit(result_list.tmp_table_created, roop_count);
+              result_list.tmp_tables_created = TRUE;
+              spider_conn_set_timeout_from_share(conn, roop_count,
+                wide_handler->trx->thd, share);
+              if (dbton_hdl->execute_sql(
+                SPIDER_SQL_TYPE_TMP_SQL,
+                conn,
+                -1,
+                &need_mons[roop_count])
+              ) {
+                DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+                DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+                conn->mta_conn_mutex_lock_already = FALSE;
+                conn->mta_conn_mutex_unlock_later = FALSE;
+                error_num = spider_db_errorno(conn);
+                if (
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+                break;
+              }
+              spider_db_discard_multiple_result(this, roop_count, conn);
+            }
+            spider_conn_set_timeout_from_share(conn, roop_count,
+              wide_handler->trx->thd, share);
+            if (dbton_hdl->execute_sql(
+              sql_type,
+              conn,
+              result_list.quick_mode,
+              &need_mons[roop_count])
+            ) {
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              error_num = spider_db_errorno(conn);
+              if (
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+              break;
+            }
+            connection_ids[roop_count] = conn->connection_id;
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            if (roop_count == link_ok)
+            {
+              if ((error_num = spider_db_store_result(this, roop_count, table)))
+              {
+                if (
+                  error_num != HA_ERR_END_OF_FILE &&
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+                break;
+              }
+              result_link_idx = link_ok;
+            } else {
+              spider_db_discard_result(this, roop_count, conn);
+              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+              pthread_mutex_unlock(&conn->mta_conn_mutex);
+            }
+        }
+      }
+      if (error_num)
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          !check_error_mode(error_num)
+        )
+          error_num = HA_ERR_END_OF_FILE;
+        if (error_num == HA_ERR_END_OF_FILE)
+        {
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+          {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res9=%d", range_res));
+          }
+          if (
+            range_res
+          ) {
+            table->status = STATUS_NOT_FOUND;
+            DBUG_RETURN(error_num);
+          }
+
+          DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+          result_list.finish_flg = FALSE;
+          result_list.record_num = 0;
+          if (result_list.current)
+          {
+            DBUG_PRINT("info",
+              ("spider result_list.current->finish_flg = FALSE"));
+            result_list.current->finish_flg = FALSE;
+            spider_db_free_one_result(&result_list,
+              (SPIDER_RESULT *) result_list.current);
+            if (result_list.current == result_list.first)
+              result_list.current = NULL;
+            else
+              result_list.current = result_list.current->prev;
+          }
+          error_num = 0;
+        } else
+          DBUG_RETURN(error_num);
+      } else {
+        if (!range_info)
+          DBUG_RETURN(0);
+        if (!(error_num = spider_db_fetch(table->record[0], this, table)))
+        {
+          *range_info = multi_range_keys[multi_range_hit_point];
+          DBUG_RETURN(0);
+        }
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          !check_error_mode(error_num)
+        )
+          error_num = HA_ERR_END_OF_FILE;
+        if (error_num == HA_ERR_END_OF_FILE)
+        {
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+          {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res10=%d", range_res));
+          }
+          if (
+            range_res
+          ) {
+            table->status = STATUS_NOT_FOUND;
+            DBUG_RETURN(error_num);
+          }
+
+          DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+          result_list.finish_flg = FALSE;
+          result_list.record_num = 0;
+          if (result_list.current)
+          {
+            DBUG_PRINT("info",
+              ("spider result_list.current->finish_flg = FALSE"));
+            result_list.current->finish_flg = FALSE;
+            spider_db_free_one_result(&result_list,
+              (SPIDER_RESULT *) result_list.current);
+            if (result_list.current == result_list.first)
+              result_list.current = NULL;
+            else
+              result_list.current = result_list.current->prev;
+          }
+          error_num = 0;
+        } else
+          DBUG_RETURN(error_num);
+      }
+      if (check_no_where_cond())
+      {
+        DBUG_RETURN(check_error_mode_eof(0));
+      }
+      multi_range_cnt = 0;
+      if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    } while (!error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_multi_range_read_next(
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_multi_range_read_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      multi_range_read_next_first(NULL);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::multi_range_read_next(
+  range_id_t *range_info
+)
+{
+  int error_num;
+  DBUG_ENTER("ha_spider::multi_range_read_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+    mrr_have_range = TRUE;
+    DBUG_RETURN(multi_range_read_next_next(range_info));
+  }
+  if (!mrr_have_range)
+  {
+    error_num = multi_range_read_next_first(range_info);
+    mrr_have_range = TRUE;
+  } else
+    error_num = multi_range_read_next_next(range_info);
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::multi_range_read_next_next(
+  range_id_t *range_info
+)
+{
+  int error_num, roop_count;
+  SPIDER_CONN *conn;
+  int range_res;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::multi_range_read_next_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  if (multi_range_num == 1 || result_list.multi_split_read <= 1)
+  {
+    if (!(error_num = spider_db_seek_next(table->record[0], this,
+      search_link_idx, table)))
+    {
+      *range_info = (char *) mrr_cur_range.ptr;
+      DBUG_RETURN(0);
+    }
+
+    range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+    DBUG_PRINT("info",("spider range_res1=%d", range_res));
+    if (
+      error_num != HA_ERR_END_OF_FILE &&
+      !check_error_mode(error_num)
+    )
+      error_num = HA_ERR_END_OF_FILE;
+    if (
+      error_num != HA_ERR_END_OF_FILE ||
+      range_res
+    )
+      DBUG_RETURN(error_num);
+    spider_db_free_one_result_for_start_next(this);
+    spider_first_split_read_param(this);
+    if ((error_num = spider_set_conn_bg_param(this)))
+      DBUG_RETURN(error_num);
+    DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+    result_list.finish_flg = FALSE;
+    if (result_list.current)
+    {
+      DBUG_PRINT("info",("spider result_list.current->finish_flg = FALSE"));
+      result_list.current->finish_flg = FALSE;
+    }
+    result_list.record_num = 0;
+    do
+    {
+      DBUG_PRINT("info",("spider range_res2=%d", range_res));
+      if (check_no_where_cond())
+      {
+        DBUG_RETURN(check_error_mode_eof(0));
+      }
+      set_where_to_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+      result_list.limit_num =
+        result_list.internal_limit - result_list.record_num >=
+        result_list.split_read ?
+        result_list.split_read :
+        result_list.internal_limit - result_list.record_num;
+      if (
+        (error_num = spider_db_append_key_where(
+          &mrr_cur_range.start_key,
+          SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE) ?
+          NULL : &mrr_cur_range.end_key, this))
+      )
+        DBUG_RETURN(error_num);
+      {
+        if (result_list.direct_order_limit)
+        {
+          if ((error_num =
+            append_key_order_for_direct_order_limit_with_alias_sql_part(
+              NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        } else {
+          if ((error_num = append_key_order_with_alias_sql_part(
+            NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        if ((error_num = append_limit_sql_part(
+          result_list.internal_offset + result_list.record_num,
+          result_list.limit_num,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        if (
+          (error_num = append_select_lock_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL))
+        ) {
+          DBUG_RETURN(error_num);
+        }
+      }
+
+      int roop_start, roop_end, tmp_lock_mode, link_ok;
+      tmp_lock_mode = spider_conn_lock_mode(this);
+      if (tmp_lock_mode)
+      {
+        /* "for update" or "lock in share mode" */
+        link_ok = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_OK);
+        roop_start = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY);
+        roop_end = share->link_count;
+      } else {
+        link_ok = search_link_idx;
+        roop_start = search_link_idx;
+        roop_end = search_link_idx + 1;
+      }
+      for (roop_count = roop_start; roop_count < roop_end;
+        roop_count = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, roop_count, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY)
+      ) {
+        if (result_list.bgs_phase > 0)
+        {
+          if ((error_num = spider_check_and_init_casual_read(
+            wide_handler->trx->thd, this,
+            roop_count)))
+            DBUG_RETURN(error_num);
+          error_num = spider_bg_conn_search(this, roop_count, roop_start,
+            TRUE, FALSE, (roop_count != link_ok));
+          if (
+            error_num &&
+            error_num != HA_ERR_END_OF_FILE &&
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+        } else {
+          ulong sql_type;
+          conn= conns[roop_count];
+          sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+          spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+          pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+          if ((error_num =
+            dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+          {
+            DBUG_RETURN(error_num);
+          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+            conn->need_mon = &need_mons[roop_count];
+            DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = TRUE;
+            conn->mta_conn_mutex_unlock_later = TRUE;
+            if ((error_num = spider_db_set_names(this, conn,
+              roop_count)))
+            {
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+              pthread_mutex_unlock(&conn->mta_conn_mutex);
+              if (
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+            }
+            if (!error_num)
+            {
+              spider_conn_set_timeout_from_share(conn, roop_count,
+                wide_handler->trx->thd, share);
+              if (dbton_hdl->execute_sql(
+                sql_type,
+                conn,
+                result_list.quick_mode,
+                &need_mons[roop_count])
+              ) {
+                DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+                DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+                conn->mta_conn_mutex_lock_already = FALSE;
+                conn->mta_conn_mutex_unlock_later = FALSE;
+                error_num = spider_db_errorno(conn);
+                if (
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+              }
+            }
+            if (!error_num)
+            {
+              connection_ids[roop_count] = conn->connection_id;
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              if (roop_count == link_ok)
+              {
+                error_num = spider_db_store_result(this, roop_count, table);
+                if (
+                  error_num &&
+                  error_num != HA_ERR_END_OF_FILE &&
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+                result_link_idx = link_ok;
+              } else {
+                spider_db_discard_result(this, roop_count, conn);
+                SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+                pthread_mutex_unlock(&conn->mta_conn_mutex);
+              }
+            }
+        }
+        if (error_num)
+          break;
+      }
+      if (error_num)
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          !check_error_mode(error_num)
+        )
+          error_num = HA_ERR_END_OF_FILE;
+        if (error_num == HA_ERR_END_OF_FILE)
+        {
+          DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+          result_list.finish_flg = FALSE;
+          result_list.record_num = 0;
+          if (result_list.current)
+          {
+            DBUG_PRINT("info",
+              ("spider result_list.current->finish_flg = FALSE"));
+            result_list.current->finish_flg = FALSE;
+            spider_db_free_one_result(&result_list,
+              (SPIDER_RESULT *) result_list.current);
+            result_list.current = result_list.current->prev;
+          }
+        } else
+          DBUG_RETURN(error_num);
+      } else {
+        if (!(error_num = spider_db_fetch(table->record[0], this, table)))
+        {
+          *range_info = (char *) mrr_cur_range.ptr;
+          DBUG_RETURN(0);
+        }
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          !check_error_mode(error_num)
+        )
+          error_num = HA_ERR_END_OF_FILE;
+        if (error_num == HA_ERR_END_OF_FILE)
+        {
+          DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+          result_list.finish_flg = FALSE;
+          result_list.record_num = 0;
+          if (result_list.current)
+          {
+            DBUG_PRINT("info",
+              ("spider result_list.current->finish_flg = FALSE"));
+            result_list.current->finish_flg = FALSE;
+            spider_db_free_one_result(&result_list,
+              (SPIDER_RESULT *) result_list.current);
+            result_list.current = result_list.current->prev;
+          }
+        } else
+          DBUG_RETURN(error_num);
+      }
+      range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+      DBUG_PRINT("info",("spider range_res3=%d", range_res));
+    }
+    while (!range_res);
+    if (error_num)
+      DBUG_RETURN(check_error_mode_eof(error_num));
+  } else {
+    if (!(error_num = spider_db_seek_next(table->record[0], this,
+      search_link_idx, table)))
+    {
+      *range_info = multi_range_keys[multi_range_hit_point];
+      DBUG_RETURN(0);
+    }
+
+    const uchar *first_mrr_start_key;
+    const uchar *first_mrr_end_key;
+    uint first_mrr_start_key_length;
+    uint first_mrr_end_key_length;
+    if (!result_list.tmp_table_join_break_after_get_next)
+    {
+      range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+      DBUG_PRINT("info",("spider range_res4=%d", range_res));
+      if (!range_res)
+      {
+        mrr_key_buff[0].length(0);
+        first_mrr_start_key = mrr_cur_range.start_key.key;
+        first_mrr_start_key_length = mrr_cur_range.start_key.length;
+        if (first_mrr_start_key_length)
+        {
+          if (mrr_key_buff[0].reserve(first_mrr_start_key_length))
+            DBUG_RETURN(HA_ERR_END_OF_FILE);
+          mrr_key_buff[0].q_append((const char *) first_mrr_start_key,
+            first_mrr_start_key_length);
+          mrr_cur_range.start_key.key = (const uchar *) mrr_key_buff[0].ptr();
+        }
+        mrr_key_buff[1].length(0);
+        first_mrr_end_key = mrr_cur_range.end_key.key;
+        first_mrr_end_key_length = mrr_cur_range.end_key.length;
+        if (first_mrr_end_key_length)
+        {
+          if (mrr_key_buff[1].reserve(first_mrr_end_key_length))
+            DBUG_RETURN(HA_ERR_END_OF_FILE);
+          mrr_key_buff[1].q_append((const char *) first_mrr_end_key,
+            first_mrr_end_key_length);
+          mrr_cur_range.end_key.key = (const uchar *) mrr_key_buff[1].ptr();
+        }
+      }
+    } else {
+      result_list.tmp_table_join_break_after_get_next = FALSE;
+      range_res = 0;
+    }
+
+    if (
+      error_num != HA_ERR_END_OF_FILE &&
+      !check_error_mode(error_num)
+    )
+      error_num = HA_ERR_END_OF_FILE;
+    if (
+      error_num != HA_ERR_END_OF_FILE ||
+      range_res
+    )
+      DBUG_RETURN(error_num);
+    if (check_no_where_cond())
+    {
+      DBUG_RETURN(check_error_mode_eof(0));
+    }
+    spider_db_free_one_result_for_start_next(this);
+    spider_first_split_read_param(this);
+    if ((error_num = spider_set_conn_bg_param(this)))
+      DBUG_RETURN(error_num);
+    DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+    result_list.finish_flg = FALSE;
+    if (result_list.current)
+    {
+      DBUG_PRINT("info",("spider result_list.current->finish_flg = FALSE"));
+      result_list.current->finish_flg = FALSE;
+    }
+    result_list.record_num = 0;
+
+    if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+      DBUG_RETURN(error_num);
+
+    bool tmp_high_priority = wide_handler->high_priority;
+    bool have_multi_range;
+    multi_range_cnt = 0;
+    error_num = 0;
+    do
+    {
+      if (
+        !have_second_range &&
+        (range_res = mrr_funcs.next(mrr_iter, &mrr_second_range))
+      )
+      {
+        have_second_range = FALSE;
+        have_multi_range = FALSE;
+      } else {
+        have_second_range = TRUE;
+        have_multi_range = TRUE;
+      }
+      DBUG_PRINT("info",("spider range_res5=%d", range_res));
+      result_list.tmp_reuse_sql = FALSE;
+      if (bka_mode &&
+        have_multi_range &&
+        SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE)
+      ) {
+        if (
+          result_list.tmp_table_join &&
+          result_list.tmp_table_join_key_part_map ==
+            mrr_cur_range.start_key.keypart_map
+        ) {
+          /* reuse tmp_sql */
+          result_list.tmp_reuse_sql = TRUE;
+        } else {
+          /* create tmp_sql */
+          result_list.tmp_table_join = TRUE;
+          result_list.tmp_table_join_key_part_map =
+            mrr_cur_range.start_key.keypart_map;
+          if ((error_num = reset_sql_sql(
+            SPIDER_SQL_TYPE_SELECT_SQL | SPIDER_SQL_TYPE_TMP_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        memset(result_list.tmp_table_join_first, 0xFF,
+          share->link_bitmap_size);
+      } else {
+        result_list.tmp_table_join = FALSE;
+      }
+
+      if (result_list.tmp_table_join)
+      {
+        result_list.limit_num =
+          result_list.internal_limit - result_list.record_num >=
+          result_list.split_read ?
+          result_list.split_read :
+          result_list.internal_limit - result_list.record_num;
+        if (bka_mode == 2)
+        {
+          if (!result_list.tmp_reuse_sql)
+          {
+            if ((error_num = append_union_table_and_sql_for_bka(
+              &mrr_cur_range.start_key
+            ))) {
+              DBUG_RETURN(error_num);
+            }
+          } else {
+            if ((error_num = reuse_union_table_and_sql_for_bka()))
+            {
+              DBUG_RETURN(error_num);
+            }
+          }
+        } else {
+          if (!result_list.tmp_reuse_sql)
+          {
+            if ((error_num = append_tmp_table_and_sql_for_bka(
+              &mrr_cur_range.start_key
+            ))) {
+              DBUG_RETURN(error_num);
+            }
+          } else {
+            if ((error_num = reuse_tmp_table_and_sql_for_bka()))
+            {
+              DBUG_RETURN(error_num);
+            }
+          }
+        }
+
+        do
+        {
+          if (
+            !SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE) ||
+            result_list.tmp_table_join_key_part_map !=
+              mrr_cur_range.start_key.keypart_map
+          ) {
+            result_list.tmp_table_join_break_after_get_next = TRUE;
+            break;
+          }
+
+          multi_range_keys[multi_range_cnt] = mrr_cur_range.ptr;
+          if (bka_mode == 2)
+          {
+            if ((error_num = spider_db_append_select(this)))
+              DBUG_RETURN(error_num);
+            if (multi_range_cnt == 0)
+            {
+              if ((error_num = append_multi_range_cnt_with_name_sql_part(
+                SPIDER_SQL_TYPE_SELECT_SQL, multi_range_cnt)))
+                DBUG_RETURN(error_num);
+              if ((error_num = append_key_column_values_with_name_sql_part(
+                &mrr_cur_range.start_key,
+                SPIDER_SQL_TYPE_SELECT_SQL)))
+                DBUG_RETURN(error_num);
+            } else {
+              if ((error_num = append_multi_range_cnt_sql_part(
+                SPIDER_SQL_TYPE_SELECT_SQL, multi_range_cnt, TRUE)))
+                DBUG_RETURN(error_num);
+              if ((error_num = append_key_column_values_sql_part(
+                &mrr_cur_range.start_key,
+                SPIDER_SQL_TYPE_SELECT_SQL)))
+                DBUG_RETURN(error_num);
+            }
+            if ((error_num = append_union_table_connector_sql_part(
+              SPIDER_SQL_TYPE_SELECT_SQL)))
+              DBUG_RETURN(error_num);
+          } else {
+            if ((error_num = append_multi_range_cnt_sql_part(
+              SPIDER_SQL_TYPE_TMP_SQL, multi_range_cnt, TRUE)))
+              DBUG_RETURN(error_num);
+            if ((error_num = append_key_column_values_sql_part(
+              &mrr_cur_range.start_key,
+              SPIDER_SQL_TYPE_TMP_SQL)))
+              DBUG_RETURN(error_num);
+
+            if ((error_num =
+              append_values_connector_sql_part(SPIDER_SQL_TYPE_TMP_SQL)))
+              DBUG_RETURN(error_num);
+          }
+          multi_range_cnt++;
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+            break;
+          if (multi_range_cnt == 1)
+          {
+            if (have_multi_range)
+            {
+              memcpy(&mrr_cur_range, &mrr_second_range,
+                sizeof(KEY_MULTI_RANGE));
+              have_second_range = FALSE;
+              range_res = 0;
+            } else {
+              range_res = 1;
+            }
+          } else {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res6=%d", range_res));
+          }
+        }
+        while (!range_res);
+        if (bka_mode == 2)
+        {
+          if ((error_num = append_union_table_terminator_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        } else {
+          if ((error_num =
+            append_values_terminator_sql_part(SPIDER_SQL_TYPE_TMP_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        result_list.use_union = FALSE;
+
+        if ((error_num = append_limit_sql_part(
+          result_list.internal_offset,
+          result_list.limit_num,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        if (
+          (error_num = append_select_lock_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL))
+        ) {
+          DBUG_RETURN(error_num);
+        }
+      } else {
+        result_list.limit_num =
+          result_list.internal_limit - result_list.record_num;
+        if (
+          (error_num = init_union_table_name_pos_sql()) ||
+          (error_num =
+            append_union_all_start_sql_part(SPIDER_SQL_TYPE_SELECT_SQL))
+        )
+          DBUG_RETURN(error_num);
+        do
+        {
+          multi_range_keys[multi_range_cnt] = mrr_cur_range.ptr;
+          if ((error_num = spider_db_append_select(this)))
+            DBUG_RETURN(error_num);
+          if ((error_num = append_multi_range_cnt_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL, multi_range_cnt, TRUE)))
+            DBUG_RETURN(error_num);
+          if (
+            (error_num = spider_db_append_select_columns(this)) ||
+            (error_num = set_union_table_name_pos_sql())
+          )
+            DBUG_RETURN(error_num);
+          wide_handler->high_priority = FALSE;
+          if (
+            share->key_hint &&
+            (error_num = append_hint_after_table_sql_part(
+              SPIDER_SQL_TYPE_SELECT_SQL))
+          )
+            DBUG_RETURN(error_num);
+          set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+          if (
+            (error_num = spider_db_append_key_where(
+              &mrr_cur_range.start_key,
+              SPIDER_TEST(mrr_cur_range.range_flag & EQ_RANGE) ?
+              NULL : &mrr_cur_range.end_key, this))
+          )
+            DBUG_RETURN(error_num);
+          if (result_list.direct_order_limit)
+          {
+            if ((error_num =
+              append_key_order_for_direct_order_limit_with_alias_sql_part(
+                NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+              DBUG_RETURN(error_num);
+          } else {
+            if ((error_num = append_key_order_with_alias_sql_part(
+              NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+              DBUG_RETURN(error_num);
+          }
+          if ((error_num = append_limit_sql_part(
+            0,
+            result_list.internal_offset + result_list.limit_num,
+            SPIDER_SQL_TYPE_SELECT_SQL)))
+          {
+            DBUG_RETURN(error_num);
+          }
+          if ((error_num = append_select_lock_sql_part(
+            SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+          if ((error_num =
+            append_union_all_sql_part(SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+          multi_range_cnt++;
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+            break;
+          if (multi_range_cnt == 1)
+          {
+            if (have_multi_range)
+            {
+              memcpy(&mrr_cur_range, &mrr_second_range,
+                sizeof(KEY_MULTI_RANGE));
+              have_second_range = FALSE;
+              range_res = 0;
+            } else {
+              range_res = 1;
+            }
+          } else {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res7=%d", range_res));
+          }
+        }
+        while (!range_res);
+        wide_handler->high_priority = tmp_high_priority;
+        if ((error_num =
+          append_union_all_end_sql_part(SPIDER_SQL_TYPE_SELECT_SQL)))
+          DBUG_RETURN(error_num);
+        result_list.use_union = TRUE;
+
+        bool direct_aggregate_backup = result_list.direct_aggregate;
+        result_list.direct_aggregate = FALSE;
+        if (result_list.direct_order_limit)
+        {
+          if ((error_num =
+            append_key_order_for_direct_order_limit_with_alias_sql_part(
+              NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        } else {
+          if ((error_num = append_key_order_with_alias_sql_part(
+            NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+            DBUG_RETURN(error_num);
+        }
+        result_list.direct_aggregate = direct_aggregate_backup;
+        if ((error_num = append_limit_sql_part(
+          result_list.internal_offset,
+          result_list.limit_num,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        {
+          DBUG_RETURN(error_num);
+        }
+      }
+
+      int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+      tmp_lock_mode = spider_conn_lock_mode(this);
+      if (tmp_lock_mode)
+      {
+        /* "for update" or "lock in share mode" */
+        link_ok = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_OK);
+        roop_start = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, -1, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY);
+        roop_end = share->link_count;
+      } else {
+        link_ok = search_link_idx;
+        roop_start = search_link_idx;
+        roop_end = search_link_idx + 1;
+      }
+      for (roop_count = roop_start; roop_count < roop_end;
+        roop_count = spider_conn_link_idx_next(share->link_statuses,
+          conn_link_idx, roop_count, share->link_count,
+          SPIDER_LINK_STATUS_RECOVERY)
+      ) {
+        if (result_list.bgs_phase > 0)
+        {
+          if ((error_num = spider_check_and_init_casual_read(
+            wide_handler->trx->thd, this,
+            roop_count)))
+            DBUG_RETURN(error_num);
+          if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+            TRUE, FALSE, (roop_count != link_ok))))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            break;
+          }
+        } else {
+          ulong sql_type;
+          conn= conns[roop_count];
+          sql_type= SPIDER_SQL_TYPE_SELECT_SQL | SPIDER_SQL_TYPE_TMP_SQL;
+          spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+          pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+          if ((error_num =
+            dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+          {
+            DBUG_RETURN(error_num);
+          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          sql_type &= ~SPIDER_SQL_TYPE_TMP_SQL;
+          DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+            conn->need_mon = &need_mons[roop_count];
+            DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = TRUE;
+            conn->mta_conn_mutex_unlock_later = TRUE;
+            if ((error_num = spider_db_set_names(this, conn,
+              roop_count)))
+            {
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+              pthread_mutex_unlock(&conn->mta_conn_mutex);
+              if (
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+              break;
+            }
+            if (
+              result_list.tmp_table_join && bka_mode != 2 &&
+              spider_bit_is_set(result_list.tmp_table_join_first, roop_count)
+            ) {
+              spider_clear_bit(result_list.tmp_table_join_first, roop_count);
+              spider_set_bit(result_list.tmp_table_created, roop_count);
+              result_list.tmp_tables_created = TRUE;
+              spider_conn_set_timeout_from_share(conn, roop_count,
+                wide_handler->trx->thd, share);
+              if (dbton_hdl->execute_sql(
+                SPIDER_SQL_TYPE_TMP_SQL,
+                conn,
+                -1,
+                &need_mons[roop_count])
+              ) {
+                DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+                DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+                conn->mta_conn_mutex_lock_already = FALSE;
+                conn->mta_conn_mutex_unlock_later = FALSE;
+                error_num = spider_db_errorno(conn);
+                if (
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+                break;
+              }
+              spider_db_discard_multiple_result(this, roop_count, conn);
+            }
+            spider_conn_set_timeout_from_share(conn, roop_count,
+              wide_handler->trx->thd, share);
+            if (dbton_hdl->execute_sql(
+              sql_type,
+              conn,
+              result_list.quick_mode,
+              &need_mons[roop_count])
+            ) {
+              DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+              DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+              conn->mta_conn_mutex_lock_already = FALSE;
+              conn->mta_conn_mutex_unlock_later = FALSE;
+              error_num = spider_db_errorno(conn);
+              if (
+                share->monitoring_kind[roop_count] &&
+                need_mons[roop_count]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    roop_count,
+                    (uint32) share->monitoring_sid[roop_count],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[roop_count],
+                    NULL,
+                    0,
+                    share->monitoring_kind[roop_count],
+                    share->monitoring_limit[roop_count],
+                    share->monitoring_flag[roop_count],
+                    TRUE
+                  );
+              }
+              break;
+            }
+            connection_ids[roop_count] = conn->connection_id;
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            if (roop_count == link_ok)
+            {
+              if ((error_num = spider_db_store_result(this, roop_count, table)))
+              {
+                if (
+                  error_num != HA_ERR_END_OF_FILE &&
+                  share->monitoring_kind[roop_count] &&
+                  need_mons[roop_count]
+                ) {
+                  error_num = spider_ping_table_mon_from_table(
+                      wide_handler->trx,
+                      wide_handler->trx->thd,
+                      share,
+                      roop_count,
+                      (uint32) share->monitoring_sid[roop_count],
+                      share->table_name,
+                      share->table_name_length,
+                      conn_link_idx[roop_count],
+                      NULL,
+                      0,
+                      share->monitoring_kind[roop_count],
+                      share->monitoring_limit[roop_count],
+                      share->monitoring_flag[roop_count],
+                      TRUE
+                    );
+                }
+                break;
+              }
+              result_link_idx = link_ok;
+            } else {
+              spider_db_discard_result(this, roop_count, conn);
+              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+              pthread_mutex_unlock(&conn->mta_conn_mutex);
+            }
+        }
+      }
+      if (error_num)
+      {
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          !check_error_mode(error_num)
+        )
+          error_num = HA_ERR_END_OF_FILE;
+        if (error_num == HA_ERR_END_OF_FILE)
+        {
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+          {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res8=%d", range_res));
+          }
+          if (
+            range_res
+          ) {
+            table->status = STATUS_NOT_FOUND;
+            DBUG_RETURN(error_num);
+          }
+
+          DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+          result_list.finish_flg = FALSE;
+          result_list.record_num = 0;
+          if (result_list.current)
+          {
+            DBUG_PRINT("info",
+              ("spider result_list.current->finish_flg = FALSE"));
+            result_list.current->finish_flg = FALSE;
+            spider_db_free_one_result(&result_list,
+              (SPIDER_RESULT *) result_list.current);
+            if (result_list.current == result_list.first)
+              result_list.current = NULL;
+            else
+              result_list.current = result_list.current->prev;
+          }
+          error_num = 0;
+        } else
+          DBUG_RETURN(error_num);
+      } else {
+        if (!(error_num = spider_db_fetch(table->record[0], this, table)))
+        {
+          *range_info = multi_range_keys[multi_range_hit_point];
+          DBUG_RETURN(0);
+        }
+        if (
+          error_num != HA_ERR_END_OF_FILE &&
+          !check_error_mode(error_num)
+        )
+          error_num = HA_ERR_END_OF_FILE;
+        if (error_num == HA_ERR_END_OF_FILE)
+        {
+          if (multi_range_cnt >= (uint) result_list.multi_split_read)
+          {
+            range_res = mrr_funcs.next(mrr_iter, &mrr_cur_range);
+            DBUG_PRINT("info",("spider range_res9=%d", range_res));
+          }
+          if (
+            range_res
+          ) {
+            table->status = STATUS_NOT_FOUND;
+            DBUG_RETURN(error_num);
+          }
+
+          DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+          result_list.finish_flg = FALSE;
+          result_list.record_num = 0;
+          if (result_list.current)
+          {
+            DBUG_PRINT("info",
+              ("spider result_list.current->finish_flg = FALSE"));
+            result_list.current->finish_flg = FALSE;
+            spider_db_free_one_result(&result_list,
+              (SPIDER_RESULT *) result_list.current);
+            if (result_list.current == result_list.first)
+              result_list.current = NULL;
+            else
+              result_list.current = result_list.current->prev;
+          }
+          error_num = 0;
+        } else
+          DBUG_RETURN(error_num);
+      }
+      if (check_no_where_cond())
+      {
+        DBUG_RETURN(check_error_mode_eof(0));
+      }
+      multi_range_cnt = 0;
+      if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    } while (!error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::rnd_init(
+  bool scan
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::rnd_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider scan=%s", scan ? "TRUE" : "FALSE"));
+  if (!dml_inited)
+  {
+    if (unlikely((error_num = dml_init())))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+  pushed_pos = NULL;
+/*
+  if (wide_handler->external_lock_type == F_WRLCK)
+    check_and_start_bulk_update(SPD_BU_START_BY_INDEX_OR_RND_INIT);
+*/
+  rnd_scan_and_first = scan;
+  if (
+    scan &&
+    wide_handler->sql_command != SQLCOM_ALTER_TABLE
+  ) {
+    spider_set_result_list_param(this);
+    pk_update = FALSE;
+    if (
+      result_list.current &&
+      !result_list.low_mem_read &&
+      prev_index_rnd_init == SPD_RND
+    ) {
+      result_list.current = result_list.first;
+      spider_db_set_pos_to_first_row(&result_list);
+      rnd_scan_and_first = FALSE;
+    } else {
+      spider_db_free_one_result_for_start_next(this);
+      if (
+        result_list.current &&
+        result_list.low_mem_read
+      ) {
+        int roop_start, roop_end, roop_count, tmp_lock_mode;
+        tmp_lock_mode = spider_conn_lock_mode(this);
+        if (tmp_lock_mode)
+        {
+          /* "for update" or "lock in share mode" */
+          roop_start = spider_conn_link_idx_next(share->link_statuses,
+            conn_link_idx, -1, share->link_count,
+            SPIDER_LINK_STATUS_RECOVERY);
+          roop_end = share->link_count;
+        } else {
+          roop_start = search_link_idx;
+          roop_end = search_link_idx + 1;
+        }
+        for (roop_count = roop_start; roop_count < roop_end;
+          roop_count = spider_conn_link_idx_next(share->link_statuses,
+            conn_link_idx, roop_count, share->link_count,
+            SPIDER_LINK_STATUS_RECOVERY)
+        ) {
+          if (conns[roop_count] && result_list.bgs_working)
+            spider_bg_conn_break(conns[roop_count], this);
+          if (quick_targets[roop_count])
+          {
+            spider_db_free_one_quick_result(
+              (SPIDER_RESULT *) result_list.current);
+            DBUG_ASSERT(quick_targets[roop_count] ==
+              conns[roop_count]->quick_target);
+            DBUG_PRINT("info", ("spider conn[%p]->quick_target=NULL",
+              conns[roop_count]));
+            conns[roop_count]->quick_target = NULL;
+            quick_targets[roop_count] = NULL;
+          }
+        }
+        result_list.record_num = 0;
+        DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+        result_list.finish_flg = FALSE;
+        result_list.quick_phase = 0;
+        result_list.bgs_phase = 0;
+      }
+
+      mrr_with_cnt = FALSE;
+      use_spatial_index = FALSE;
+
+      if (
+        wide_handler->update_request &&
+        share->have_recovery_link &&
+        wide_handler->external_lock_type == F_WRLCK &&
+        (pk_update = spider_check_pk_update(table))
+      ) {
+        bitmap_set_all(table->read_set);
+        if (is_clone)
+          memset(wide_handler->searched_bitmap, 0xFF,
+            no_bytes_in_map(table->read_set));
+      }
+
+      set_select_column_mode();
+      result_list.keyread = FALSE;
+
+      init_rnd_handler = FALSE;
+      if ((error_num= reset_sql_sql(SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+      result_list.check_direct_order_limit = FALSE;
+    }
+  }
+  prev_index_rnd_init = SPD_RND;
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::rnd_end()
+{
+/*
+  int error_num;
+  backup_error_status();
+*/
+  DBUG_ENTER("ha_spider::rnd_end");
+  DBUG_PRINT("info",("spider this=%p", this));
+/*
+#ifdef INFO_KIND_FORCE_LIMIT_BEGIN
+  info_limit = 9223372036854775807LL;
+#endif
+  if (
+    (error_num = check_and_end_bulk_update(
+      SPD_BU_START_BY_INDEX_OR_RND_INIT)) ||
+    (error_num = spider_trx_check_link_idx_failed(this))
+  )
+    DBUG_RETURN(check_error_mode(error_num));
+*/
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::rnd_next_internal(
+  uchar *buf
+) {
+  int error_num;
+  ha_spider *direct_limit_offset_spider =
+    (ha_spider *) partition_handler->owner;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::rnd_next_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  /* do not copy table data at alter table */
+  if (wide_handler->sql_command == SQLCOM_ALTER_TABLE)
+    DBUG_RETURN(HA_ERR_END_OF_FILE);
+  do_direct_update = FALSE;
+
+  if (rnd_scan_and_first)
+  {
+    if ((error_num = spider_set_conn_bg_param(this)))
+      DBUG_RETURN(error_num);
+    check_direct_order_limit();
+    check_select_column(TRUE);
+
+    if (this->result_list.direct_limit_offset)
+    {
+      if (direct_limit_offset_spider->direct_select_limit == 0)
+      { // mean has got all result
+        DBUG_RETURN(check_error_mode_eof(HA_ERR_END_OF_FILE));
+      }
+      if (
+        partition_handler->handlers &&
+        direct_limit_offset_spider->direct_current_offset > 0
+      ) {
+        longlong table_count = this->records();
+        DBUG_PRINT("info",("spider table_count=%lld", table_count));
+        if (table_count <= direct_limit_offset_spider->direct_current_offset)
+        {
+          // skip this spider(partition)
+          direct_limit_offset_spider->direct_current_offset -= table_count;
+          DBUG_PRINT("info",("spider direct_current_offset=%lld",
+            direct_limit_offset_spider->direct_current_offset));
+          DBUG_RETURN(check_error_mode_eof(HA_ERR_END_OF_FILE));
+        }
+      }
+
+      // make the offset/limit statement
+      DBUG_PRINT("info",("spider direct_current_offset=%lld",
+        direct_limit_offset_spider->direct_current_offset));
+      result_list.internal_offset = direct_limit_offset_spider->direct_current_offset;
+      DBUG_PRINT("info",("spider direct_select_limit=%lld",
+        direct_limit_offset_spider->direct_select_limit));
+      result_list.internal_limit = direct_limit_offset_spider->direct_select_limit;
+      result_list.split_read = direct_limit_offset_spider->direct_select_limit;
+
+      // start with this spider(partition)
+      direct_limit_offset_spider->direct_current_offset = 0;
+    }
+
+    DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+    result_list.finish_flg = FALSE;
+    result_list.record_num = 0;
+    if (
+      (error_num = spider_db_append_select(this)) ||
+      (error_num = spider_db_append_select_columns(this))
+    )
+      DBUG_RETURN(error_num);
+    set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+
+    /* append condition pushdown */
+    if (spider_db_append_condition(this, NULL, 0, FALSE))
+      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+
+    set_order_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+    if (result_list.direct_order_limit)
+    {
+      if ((error_num =
+        append_key_order_for_direct_order_limit_with_alias_sql_part(
+          NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    else if (result_list.direct_aggregate)
+    {
+      if ((error_num =
+        append_group_by_sql_part(NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    result_list.desc_flg = FALSE;
+    result_list.sorted = FALSE;
+    result_list.key_info = NULL;
+    result_list.limit_num =
+      result_list.internal_limit >= result_list.split_read ?
+      result_list.split_read : result_list.internal_limit;
+    {
+      if ((error_num = append_limit_sql_part(
+        result_list.internal_offset,
+        result_list.limit_num,
+        SPIDER_SQL_TYPE_SELECT_SQL)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      if (
+        (error_num = append_select_lock_sql_part(
+          SPIDER_SQL_TYPE_SELECT_SQL))
+      ) {
+        DBUG_RETURN(error_num);
+      }
+    }
+
+    int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+    tmp_lock_mode = spider_conn_lock_mode(this);
+    if (tmp_lock_mode)
+    {
+      /* "for update" or "lock in share mode" */
+      link_ok = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_OK);
+      roop_start = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_end = share->link_count;
+    } else {
+      link_ok = search_link_idx;
+      roop_start = search_link_idx;
+      roop_end = search_link_idx + 1;
+    }
+    for (roop_count = roop_start; roop_count < roop_end;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (result_list.bgs_phase > 0)
+      {
+        if ((error_num = spider_check_and_init_casual_read(
+          wide_handler->trx->thd, this,
+          roop_count)))
+          DBUG_RETURN(error_num);
+        if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+          TRUE, FALSE, (roop_count != link_ok))))
+        {
+          if (
+            error_num != HA_ERR_END_OF_FILE &&
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+      } else {
+        SPIDER_CONN *conn = conns[roop_count];
+        ulong sql_type;
+        sql_type= SPIDER_SQL_TYPE_SELECT_SQL;
+        spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
+        pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+        if ((error_num =
+          dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
+        conn->need_mon = &need_mons[roop_count];
+        DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = TRUE;
+        conn->mta_conn_mutex_unlock_later = TRUE;
+        if ((error_num = spider_db_set_names(this, conn,
+          roop_count)))
+        {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        spider_conn_set_timeout_from_share(conn, roop_count,
+          wide_handler->trx->thd, share);
+        if (dbton_hdl->execute_sql(
+          sql_type,
+          conn,
+          result_list.quick_mode,
+          &need_mons[roop_count])
+        ) {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          error_num = spider_db_errorno(conn);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        connection_ids[roop_count] = conn->connection_id;
+        DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = FALSE;
+        conn->mta_conn_mutex_unlock_later = FALSE;
+        if (roop_count == link_ok)
+        {
+          if ((error_num = spider_db_store_result(this, roop_count, table)))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          result_link_idx = link_ok;
+        } else {
+          spider_db_discard_result(this, roop_count, conn);
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+        }
+      }
+    }
+    rnd_scan_and_first = FALSE;
+
+    if (this->result_list.direct_limit_offset)
+    {
+      if (buf && (error_num = spider_db_seek_next(buf, this, search_link_idx,
+        table)))
+        DBUG_RETURN(check_error_mode_eof(error_num));
+      DBUG_RETURN(0);
+    }
+  }
+
+  if (
+    result_list.direct_limit_offset &&
+    direct_limit_offset_spider->direct_select_offset > 0
+  ) {
+    // limit-- for each got row
+    direct_limit_offset_spider->direct_select_offset--;
+    DBUG_RETURN(0);
+  }
+
+  if (buf && (error_num = spider_db_seek_next(buf, this, search_link_idx,
+    table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_rnd_next(
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_rnd_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      rnd_next_internal(NULL);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::rnd_next(
+  uchar *buf
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::rnd_next");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+  }
+  DBUG_RETURN(rnd_next_internal(buf));
+}
+
+void ha_spider::position(
+  const uchar *record
+) {
+  DBUG_ENTER("ha_spider::position");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (pushed_pos)
+  {
+    DBUG_PRINT("info",("spider pushed_pos=%p", pushed_pos));
+    memcpy(ref, pushed_pos, ref_length);
+    DBUG_VOID_RETURN;
+  }
+  if (pt_clone_last_searcher)
+  {
+    /* sercher is cloned handler */
+    DBUG_PRINT("info",("spider cloned handler access"));
+    pt_clone_last_searcher->position(record);
+    memcpy(ref, pt_clone_last_searcher->ref, ref_length);
+  } else {
+    if (is_clone)
+    {
+      DBUG_PRINT("info",("spider set pt_clone_last_searcher (NULL) to %p",
+        pt_clone_source_handler));
+      pt_clone_source_handler->pt_clone_last_searcher = NULL;
+    }
+    memset(ref, '0', sizeof(SPIDER_POSITION));
+    DBUG_PRINT("info",("spider self position"));
+    DBUG_PRINT("info",
+      ("spider current_row_num=%lld", result_list.current_row_num));
+    if (!wide_handler->position_bitmap_init)
+    {
+      if (select_column_mode)
+      {
+        spider_db_handler *dbton_hdl =
+          dbton_handler[result_list.current->dbton_id];
+        dbton_hdl->copy_minimum_select_bitmap(wide_handler->position_bitmap);
+      }
+      wide_handler->position_bitmap_init = TRUE;
+    }
+    spider_db_create_position(this, (SPIDER_POSITION *) ref);
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::rnd_pos(
+  uchar *buf,
+  uchar *pos
+) {
+  DBUG_ENTER("ha_spider::rnd_pos");
+  DBUG_PRINT("info",("spider this=%p", this));
+#ifndef DBUG_OFF
+  for (uint roop_count = 0; roop_count < ((table->s->fields + 7) / 8);
+    roop_count++)
+  {
+    DBUG_PRINT("info",("spider roop_count=%d", roop_count));
+    DBUG_PRINT("info",("spider read_set=%d",
+      ((uchar *) table->read_set->bitmap)[roop_count]));
+  }
+#endif
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  DBUG_PRINT("info",("spider pos=%p", pos));
+  DBUG_PRINT("info",("spider buf=%p", buf));
+  pushed_pos_buf = *((SPIDER_POSITION *) pos);
+  pushed_pos = &pushed_pos_buf;
+  DBUG_RETURN(spider_db_seek_tmp(buf, &pushed_pos_buf, this, table));
+}
+
+int ha_spider::cmp_ref(
+  const uchar *ref1,
+  const uchar *ref2
+) {
+  int ret = 0;
+  DBUG_ENTER("ha_spider::cmp_ref");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider ref1=%p", ref1));
+  DBUG_PRINT("info",("spider ref2=%p", ref2));
+  result_list.in_cmp_ref = TRUE;
+  if (table_share->primary_key < MAX_KEY)
+  {
+    uchar table_key[MAX_KEY_LENGTH];
+    KEY *key_info = &table->key_info[table_share->primary_key];
+    DBUG_PRINT("info",("spider cmp by primary key"));
+    rnd_pos(table->record[0], (uchar *) ref2);
+    key_copy(
+      table_key,
+      table->record[0],
+      key_info,
+      key_info->key_length);
+    rnd_pos(table->record[0], (uchar *) ref1);
+    ret = key_cmp(key_info->key_part, table_key, key_info->key_length);
+  } else {
+    Field **field;
+    my_ptrdiff_t ptr_diff = PTR_BYTE_DIFF(table->record[1], table->record[0]);
+    DBUG_PRINT("info",("spider cmp by all rows"));
+    rnd_pos(table->record[1], (uchar *) ref2);
+    rnd_pos(table->record[0], (uchar *) ref1);
+    for (
+      field = table->field;
+      *field;
+      field++
+    ) {
+      if ((ret = (*field)->cmp_binary_offset((uint) ptr_diff)))
+      {
+        DBUG_PRINT("info",("spider different at %s",
+          SPIDER_field_name_str(*field)));
+        break;
+      }
+    }
+  }
+  result_list.in_cmp_ref = FALSE;
+  DBUG_PRINT("info",("spider ret=%d", ret));
+  DBUG_RETURN(ret);
+}
+
+float spider_ft_find_relevance(
+  FT_INFO *handler,
+  uchar *record,
+  uint length
+) {
+  DBUG_ENTER("spider_ft_find_relevance");
+  st_spider_ft_info *info = (st_spider_ft_info*) handler;
+  DBUG_PRINT("info",("spider info=%p", info));
+  DBUG_PRINT("info",("spider score=%f", info->score));
+  DBUG_RETURN(info->score);
+}
+
+float spider_ft_get_relevance(
+  FT_INFO *handler
+) {
+  DBUG_ENTER("spider_ft_get_relevance");
+  st_spider_ft_info *info = (st_spider_ft_info*) handler;
+  DBUG_PRINT("info",("spider info=%p", info));
+  DBUG_PRINT("info",("spider score=%f", info->score));
+  DBUG_RETURN(info->score);
+}
+
+void spider_ft_close_search(
+  FT_INFO *handler
+) {
+  DBUG_ENTER("spider_ft_close_search");
+  DBUG_VOID_RETURN;
+}
+
+_ft_vft spider_ft_vft = {
+  NULL, // spider_ft_read_next
+  spider_ft_find_relevance,
+  spider_ft_close_search,
+  spider_ft_get_relevance,
+  NULL // spider_ft_reinit_search
+};
+
+int ha_spider::ft_init()
+{
+  int error_num;
+  DBUG_ENTER("ha_spider::ft_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (store_error_num)
+    DBUG_RETURN(store_error_num);
+  if (active_index == MAX_KEY && inited == NONE)
+  {
+    st_spider_ft_info  *ft_info = ft_first;
+    ft_init_without_index_init = TRUE;
+    ft_init_idx = MAX_KEY;
+    while (TRUE)
+    {
+      if (ft_info->used_in_where)
+      {
+        ft_init_idx = ft_info->inx;
+        if ((error_num = index_init(ft_init_idx, FALSE)))
+          DBUG_RETURN(error_num);
+        active_index = MAX_KEY;
+        break;
+      }
+      if (ft_info == ft_current)
+        break;
+      ft_info = ft_info->next;
+    }
+    if (ft_init_idx == MAX_KEY)
+    {
+      if ((error_num = rnd_init(TRUE)))
+        DBUG_RETURN(error_num);
+    }
+  } else {
+    ft_init_idx = active_index;
+    ft_init_without_index_init = FALSE;
+  }
+
+  ft_init_and_first = TRUE;
+
+  DBUG_RETURN(0);
+}
+
+void ha_spider::ft_end()
+{
+  DBUG_ENTER("ha_spider::ft_end");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (ft_init_without_index_init)
+  {
+    if (ft_init_idx == MAX_KEY)
+      store_error_num = rnd_end();
+    else
+      store_error_num = index_end();
+  }
+  ft_init_without_index_init = FALSE;
+  handler::ft_end();
+  DBUG_VOID_RETURN;
+}
+
+FT_INFO *ha_spider::ft_init_ext(
+  uint flags,
+  uint inx,
+  String *key
+) {
+  st_spider_ft_info *tmp_ft_info;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::ft_init_ext");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider flags=%u", flags));
+  DBUG_PRINT("info",("spider inx=%u", inx));
+  DBUG_PRINT("info",("spider key=%s", key->c_ptr_safe()));
+  if (inx == NO_SUCH_KEY)
+  {
+    my_error(ER_FT_MATCHING_KEY_NOT_FOUND, MYF(0));
+    DBUG_RETURN(NULL);
+  }
+
+  tmp_ft_info = ft_current;
+  if (ft_current)
+    ft_current = ft_current->next;
+  else {
+    ft_current = ft_first;
+    set_ft_discard_bitmap();
+  }
+
+  if (!ft_current)
+  {
+    if (!(ft_current = (st_spider_ft_info *)
+      spider_malloc(spider_current_trx, 2, sizeof(st_spider_ft_info),
+        MYF(MY_WME | MY_ZEROFILL))))
+    {
+      my_error(HA_ERR_OUT_OF_MEM, MYF(0));
+      DBUG_RETURN(NULL);
+    }
+    if (tmp_ft_info)
+      tmp_ft_info->next = ft_current;
+    else
+      ft_first = ft_current;
+  }
+
+  ft_current->please = &spider_ft_vft;
+  ft_current->file = this;
+  ft_current->used_in_where = (flags & FT_SORTED);
+  ft_current->target = ft_count;
+  ft_current->flags = flags;
+  ft_current->inx = inx;
+  ft_current->key = key;
+
+  ft_count++;
+  DBUG_RETURN((FT_INFO *) ft_current);
+}
+
+int ha_spider::ft_read_internal(
+  uchar *buf
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::ft_read_internal");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->trx->thd->killed)
+  {
+    my_error(ER_QUERY_INTERRUPTED, MYF(0));
+    DBUG_RETURN(ER_QUERY_INTERRUPTED);
+  }
+  if (ft_init_and_first)
+  {
+    ft_init_and_first = FALSE;
+    spider_db_free_one_result_for_start_next(this);
+    check_direct_order_limit();
+    if ((error_num = spider_set_conn_bg_param(this)))
+      DBUG_RETURN(error_num);
+    check_select_column(FALSE);
+    DBUG_PRINT("info",("spider result_list.finish_flg = FALSE"));
+    result_list.finish_flg = FALSE;
+    result_list.record_num = 0;
+    if (wide_handler->keyread)
+      result_list.keyread = TRUE;
+    else
+      result_list.keyread = FALSE;
+    if (
+      (error_num = spider_db_append_select(this)) ||
+      (error_num = spider_db_append_select_columns(this))
+    )
+      DBUG_RETURN(error_num);
+    uint tmp_active_index = active_index;
+    active_index = ft_init_idx;
+    if (
+      ft_init_idx < MAX_KEY &&
+      share->key_hint &&
+      (error_num =
+        append_hint_after_table_sql_part(SPIDER_SQL_TYPE_SELECT_SQL))
+    ) {
+      active_index = tmp_active_index;
+      DBUG_RETURN(error_num);
+    }
+    active_index = tmp_active_index;
+    set_where_pos_sql(SPIDER_SQL_TYPE_SELECT_SQL);
+    result_list.desc_flg = FALSE;
+    result_list.sorted = TRUE;
+    if (ft_init_idx == MAX_KEY)
+      result_list.key_info = NULL;
+    else
+      result_list.key_info = &table->key_info[ft_init_idx];
+    result_list.key_order = 0;
+    result_list.limit_num =
+      result_list.internal_limit >= result_list.split_read ?
+      result_list.split_read : result_list.internal_limit;
+    if ((error_num = spider_db_append_match_where(this)))
+      DBUG_RETURN(error_num);
+    if (result_list.direct_order_limit)
+    {
+      if ((error_num =
+        append_key_order_for_direct_order_limit_with_alias_sql_part(NULL, 0,
+          SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    else if (result_list.direct_aggregate)
+    {
+      if ((error_num =
+        append_group_by_sql_part(NULL, 0, SPIDER_SQL_TYPE_SELECT_SQL)))
+        DBUG_RETURN(error_num);
+    }
+    {
+      if ((error_num = append_limit_sql_part(
+        result_list.internal_offset,
+        result_list.limit_num,
+        SPIDER_SQL_TYPE_SELECT_SQL)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      if (
+        (error_num = append_select_lock_sql_part(
+          SPIDER_SQL_TYPE_SELECT_SQL))
+      ) {
+        DBUG_RETURN(error_num);
+      }
+    }
+
+    int roop_start, roop_end, roop_count, tmp_lock_mode, link_ok;
+    tmp_lock_mode = spider_conn_lock_mode(this);
+    if (tmp_lock_mode)
+    {
+      /* "for update" or "lock in share mode" */
+      link_ok = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_OK);
+      roop_start = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_end = share->link_count;
+    } else {
+      link_ok = search_link_idx;
+      roop_start = search_link_idx;
+      roop_end = search_link_idx + 1;
+    }
+    for (roop_count = roop_start; roop_count < roop_end;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (result_list.bgs_phase > 0)
+      {
+        if ((error_num = spider_check_and_init_casual_read(
+          wide_handler->trx->thd, this,
+          roop_count)))
+          DBUG_RETURN(error_num);
+        if ((error_num = spider_bg_conn_search(this, roop_count, roop_start,
+          TRUE, FALSE, (roop_count != link_ok))))
+        {
+          if (
+            error_num != HA_ERR_END_OF_FILE &&
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+      } else {
+        uint dbton_id = share->use_sql_dbton_ids[roop_count];
+        spider_db_handler *dbton_hdl = dbton_handler[dbton_id];
+        SPIDER_CONN *conn = conns[roop_count];
+        pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+        if ((error_num = dbton_hdl->set_sql_for_exec(
+          SPIDER_SQL_TYPE_SELECT_SQL, roop_count)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        conn->need_mon = &need_mons[roop_count];
+        DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = TRUE;
+        conn->mta_conn_mutex_unlock_later = TRUE;
+        if ((error_num = spider_db_set_names(this, conn, roop_count)))
+        {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        spider_conn_set_timeout_from_share(conn, roop_count,
+          wide_handler->trx->thd, share);
+        if (dbton_hdl->execute_sql(
+          SPIDER_SQL_TYPE_SELECT_SQL,
+          conn,
+          result_list.quick_mode,
+          &need_mons[roop_count])
+        ) {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          error_num = spider_db_errorno(conn);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode_eof(error_num));
+        }
+        connection_ids[roop_count] = conn->connection_id;
+        DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = FALSE;
+        conn->mta_conn_mutex_unlock_later = FALSE;
+        if (roop_count == link_ok)
+        {
+          if ((error_num = spider_db_store_result(this, roop_count, table)))
+          {
+            if (
+              error_num != HA_ERR_END_OF_FILE &&
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode_eof(error_num));
+          }
+          result_link_idx = link_ok;
+        } else {
+          spider_db_discard_result(this, roop_count, conn);
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+        }
+      }
+    }
+  }
+
+  if (is_clone)
+  {
+    DBUG_PRINT("info",("spider set pt_clone_last_searcher to %p",
+      pt_clone_source_handler));
+    pt_clone_source_handler->pt_clone_last_searcher = this;
+  }
+  if (buf && (error_num = spider_db_seek_next(buf, this, search_link_idx,
+    table)))
+    DBUG_RETURN(check_error_mode_eof(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_ft_read(
+  bool use_parallel
+) {
+  DBUG_ENTER("ha_spider::pre_ft_read");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_pre_call(use_parallel);
+  if (use_pre_call)
+  {
+    store_error_num =
+      ft_read_internal(NULL);
+    DBUG_RETURN(store_error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::ft_read(
+  uchar *buf
+) {
+  int error_num;
+  DBUG_ENTER("ha_spider::ft_read");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (use_pre_call)
+  {
+    if (store_error_num)
+    {
+      if (store_error_num == HA_ERR_END_OF_FILE)
+        table->status = STATUS_NOT_FOUND;
+      DBUG_RETURN(store_error_num);
+    }
+    if ((error_num = spider_bg_all_conn_pre_next(this, search_link_idx)))
+      DBUG_RETURN(error_num);
+    use_pre_call = FALSE;
+  }
+  DBUG_RETURN(ft_read_internal(buf));
+}
+
+int ha_spider::info(
+  uint flag
+) {
+  int error_num;
+  THD *thd = ha_thd();
+  double sts_interval = spider_param_sts_interval(thd, share->sts_interval);
+  int sts_mode = spider_param_sts_mode(thd, share->sts_mode);
+  int sts_sync = spider_param_sts_sync(thd, share->sts_sync);
+  int sts_bg_mode = spider_param_sts_bg_mode(thd, share->sts_bg_mode);
+  SPIDER_INIT_ERROR_TABLE *spider_init_error_table = NULL;
+  set_error_mode();
+  backup_error_status();
+  DBUG_ENTER("ha_spider::info");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider flag=%x", flag));
+#ifdef HANDLER_HAS_CAN_USE_FOR_AUTO_INC_INIT
+  auto_inc_temporary = FALSE;
+#endif
+  wide_handler->sql_command = thd_sql_command(thd);
+/*
+  if (
+    sql_command == SQLCOM_DROP_TABLE ||
+    sql_command == SQLCOM_ALTER_TABLE ||
+    sql_command == SQLCOM_SHOW_CREATE
+  ) {
+*/
+    if (flag & HA_STATUS_AUTO)
+    {
+      if (share->lgtm_tblhnd_share->auto_increment_value)
+        stats.auto_increment_value =
+          share->lgtm_tblhnd_share->auto_increment_value;
+      else {
+        stats.auto_increment_value = 1;
+#ifdef HANDLER_HAS_CAN_USE_FOR_AUTO_INC_INIT
+        auto_inc_temporary = TRUE;
+#endif
+      }
+    }
+    if (
+      wide_handler->sql_command == SQLCOM_DROP_TABLE ||
+      wide_handler->sql_command == SQLCOM_ALTER_TABLE
+    )
+      DBUG_RETURN(0);
+/*
+  }
+*/
+
+  if (flag &
+    (HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE | HA_STATUS_AUTO))
+  {
+    time_t tmp_time = (time_t) time((time_t*) 0);
+    DBUG_PRINT("info",
+      ("spider difftime=%f", difftime(tmp_time, share->sts_get_time)));
+    DBUG_PRINT("info",
+      ("spider sts_interval=%f", sts_interval));
+    int tmp_auto_increment_mode = 0;
+    if (flag & HA_STATUS_AUTO)
+    {
+      tmp_auto_increment_mode = spider_param_auto_increment_mode(thd,
+        share->auto_increment_mode);
+      info_auto_called = TRUE;
+    }
+    if (!share->sts_init)
+    {
+      pthread_mutex_lock(&share->sts_mutex);
+      if (share->sts_init)
+        pthread_mutex_unlock(&share->sts_mutex);
+      else {
+        if ((spider_init_error_table =
+          spider_get_init_error_table(wide_handler->trx, share, FALSE)))
+        {
+          DBUG_PRINT("info",("spider diff=%f",
+            difftime(tmp_time, spider_init_error_table->init_error_time)));
+          if (difftime(tmp_time,
+            spider_init_error_table->init_error_time) <
+            spider_param_table_init_error_interval())
+          {
+            pthread_mutex_unlock(&share->sts_mutex);
+            if (wide_handler->sql_command == SQLCOM_SHOW_CREATE ||
+                wide_handler->sql_command == SQLCOM_SHOW_FIELDS)
+            {
+              if (thd->is_error())
+              {
+                DBUG_PRINT("info", ("spider clear_error"));
+                thd->clear_error();
+              }
+              DBUG_RETURN(0);
+            }
+            if (spider_init_error_table->init_error_with_message)
+              my_message(spider_init_error_table->init_error,
+                spider_init_error_table->init_error_msg, MYF(0));
+            DBUG_RETURN(check_error_mode(spider_init_error_table->init_error));
+          }
+        }
+        pthread_mutex_unlock(&share->sts_mutex);
+        sts_interval = 0;
+        if (tmp_auto_increment_mode == 1)
+          sts_sync = 0;
+      }
+    }
+    if (flag & HA_STATUS_AUTO)
+    {
+      if (
+        share->wide_share &&
+        tmp_auto_increment_mode == 1 &&
+        !share->lgtm_tblhnd_share->auto_increment_init
+      ) {
+        sts_interval = 0;
+        sts_sync = 0;
+      }
+    }
+    if (difftime(tmp_time, share->sts_get_time) >= sts_interval)
+    {
+      if (
+        sts_interval == 0 ||
+        !pthread_mutex_trylock(&share->sts_mutex)
+      ) {
+        if (sts_interval == 0 || sts_bg_mode == 0)
+        {
+          if (sts_interval == 0)
+            pthread_mutex_lock(&share->sts_mutex);
+          if (difftime(tmp_time, share->sts_get_time) >= sts_interval)
+          {
+            if ((error_num = spider_check_trx_and_get_conn(ha_thd(), this,
+              FALSE)))
+            {
+              pthread_mutex_unlock(&share->sts_mutex);
+              if (!share->sts_init)
+              {
+                if (
+                  spider_init_error_table ||
+                  (spider_init_error_table =
+                    spider_get_init_error_table(wide_handler->trx,
+                      share, TRUE))
+                ) {
+                  spider_init_error_table->init_error = error_num;
+                  if ((spider_init_error_table->init_error_with_message =
+                    thd->is_error()))
+                    strmov(spider_init_error_table->init_error_msg,
+                      spider_stmt_da_message(thd));
+                  spider_init_error_table->init_error_time =
+                    (time_t) time((time_t*) 0);
+                }
+                share->init_error = TRUE;
+                share->init = TRUE;
+              }
+              if (wide_handler->sql_command == SQLCOM_SHOW_CREATE ||
+                  wide_handler->sql_command == SQLCOM_SHOW_FIELDS)
+              {
+                if (thd->is_error())
+                {
+                  DBUG_PRINT("info", ("spider clear_error"));
+                  thd->clear_error();
+                }
+                DBUG_RETURN(0);
+              }
+              DBUG_RETURN(check_error_mode(error_num));
+            }
+            if ((error_num = spider_get_sts(share, search_link_idx, tmp_time,
+                this, sts_interval, sts_mode,
+                sts_sync,
+                share->sts_init ? 2 : 1,
+                flag | (share->sts_init ? 0 : HA_STATUS_AUTO)))
+            ) {
+              pthread_mutex_unlock(&share->sts_mutex);
+              if (
+                share->monitoring_kind[search_link_idx] &&
+                need_mons[search_link_idx]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    search_link_idx,
+                    (uint32) share->monitoring_sid[search_link_idx],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[search_link_idx],
+                    NULL,
+                    0,
+                    share->monitoring_kind[search_link_idx],
+                    share->monitoring_limit[search_link_idx],
+                    share->monitoring_flag[search_link_idx],
+                    TRUE
+                  );
+              }
+              if (!share->sts_init)
+              {
+                if (
+                  spider_init_error_table ||
+                  (spider_init_error_table =
+                    spider_get_init_error_table(wide_handler->trx,
+                      share, TRUE))
+                ) {
+                  spider_init_error_table->init_error = error_num;
+/*
+                  if (!thd->is_error())
+                    my_error(error_num, MYF(0), "");
+*/
+                  if ((spider_init_error_table->init_error_with_message =
+                    thd->is_error()))
+                    strmov(spider_init_error_table->init_error_msg,
+                      spider_stmt_da_message(thd));
+                  spider_init_error_table->init_error_time =
+                    (time_t) time((time_t*) 0);
+                }
+                share->init_error = TRUE;
+                share->init = TRUE;
+              }
+              if (wide_handler->sql_command == SQLCOM_SHOW_CREATE ||
+                  wide_handler->sql_command == SQLCOM_SHOW_FIELDS)
+              {
+                if (thd->is_error())
+                {
+                  DBUG_PRINT("info", ("spider clear_error"));
+                  thd->clear_error();
+                }
+                DBUG_RETURN(0);
+              }
+              DBUG_RETURN(check_error_mode(error_num));
+            }
+          }
+        } else if (sts_bg_mode == 1) {
+          /* background */
+          if (!share->bg_sts_init || share->bg_sts_thd_wait)
+          {
+            share->bg_sts_thd_wait = FALSE;
+            share->bg_sts_try_time = tmp_time;
+            share->bg_sts_interval = sts_interval;
+            share->bg_sts_mode = sts_mode;
+            share->bg_sts_sync = sts_sync;
+            if (!share->bg_sts_init)
+            {
+              if ((error_num = spider_create_sts_thread(share)))
+              {
+                pthread_mutex_unlock(&share->sts_mutex);
+                if (wide_handler->sql_command == SQLCOM_SHOW_CREATE ||
+                    wide_handler->sql_command == SQLCOM_SHOW_FIELDS)
+                {
+                  if (thd->is_error())
+                  {
+                    DBUG_PRINT("info", ("spider clear_error"));
+                    thd->clear_error();
+                  }
+                  DBUG_RETURN(0);
+                }
+                DBUG_RETURN(error_num);
+              }
+            } else
+              pthread_cond_signal(&share->bg_sts_cond);
+          }
+        } else {
+          share->bg_sts_try_time = tmp_time;
+          share->bg_sts_interval = sts_interval;
+          share->bg_sts_mode = sts_mode;
+          share->bg_sts_sync = sts_sync;
+          spider_table_add_share_to_sts_thread(share);
+        }
+        pthread_mutex_unlock(&share->sts_mutex);
+      }
+    }
+    if (flag & HA_STATUS_CONST)
+    {
+      if ((error_num = check_crd()))
+      {
+        if (wide_handler->sql_command == SQLCOM_SHOW_CREATE ||
+            wide_handler->sql_command == SQLCOM_SHOW_FIELDS)
+        {
+          if (thd->is_error())
+          {
+            DBUG_PRINT("info", ("spider clear_error"));
+            thd->clear_error();
+          }
+          DBUG_RETURN(0);
+        }
+        DBUG_RETURN(error_num);
+      }
+      spider_db_set_cardinarity(this, table);
+    }
+
+    if (flag & HA_STATUS_TIME)
+      stats.update_time = (ulong) share->stat.update_time;
+    if (flag & (HA_STATUS_CONST | HA_STATUS_VARIABLE))
+    {
+      stats.max_data_file_length = share->stat.max_data_file_length;
+      stats.create_time = share->stat.create_time;
+      stats.block_size = spider_param_block_size(thd);
+    }
+    if (flag & HA_STATUS_VARIABLE)
+    {
+      stats.data_file_length = share->stat.data_file_length;
+      stats.index_file_length = share->stat.index_file_length;
+      stats.records = share->stat.records;
+      stats.mean_rec_length = share->stat.mean_rec_length;
+      stats.check_time = share->stat.check_time;
+      if (stats.records <= 1 /* && (flag & HA_STATUS_NO_LOCK) */ )
+        stats.records = 2;
+      stats.checksum = share->stat.checksum;
+      stats.checksum_null = share->stat.checksum_null;
+    }
+    if (flag & HA_STATUS_AUTO)
+    {
+#ifdef HANDLER_HAS_CAN_USE_FOR_AUTO_INC_INIT
+      auto_inc_temporary = FALSE;
+#endif
+      if (share->wide_share && table->next_number_field)
+      {
+        ulonglong first_value, nb_reserved_values;
+        if (
+          tmp_auto_increment_mode == 0 &&
+          !(
+            table->next_number_field->val_int() != 0 ||
+            (table->auto_increment_field_not_null &&
+              thd->variables.sql_mode & MODE_NO_AUTO_VALUE_ON_ZERO)
+          )
+        ) {
+          get_auto_increment(0, 0, 0, &first_value, &nb_reserved_values);
+          share->lgtm_tblhnd_share->auto_increment_value = first_value;
+          share->lgtm_tblhnd_share->auto_increment_lclval = first_value;
+          share->lgtm_tblhnd_share->auto_increment_init = TRUE;
+          DBUG_PRINT("info",("spider init auto_increment_lclval=%llu",
+            share->lgtm_tblhnd_share->auto_increment_lclval));
+          DBUG_PRINT("info",("spider auto_increment_value=%llu",
+            share->lgtm_tblhnd_share->auto_increment_value));
+          stats.auto_increment_value = first_value;
+        } else if (tmp_auto_increment_mode == 1 &&
+          !share->lgtm_tblhnd_share->auto_increment_init)
+        {
+          DBUG_PRINT("info",("spider auto_increment_value=%llu",
+            share->lgtm_tblhnd_share->auto_increment_value));
+          share->lgtm_tblhnd_share->auto_increment_lclval =
+            share->lgtm_tblhnd_share->auto_increment_value;
+          share->lgtm_tblhnd_share->auto_increment_init = TRUE;
+          stats.auto_increment_value =
+            share->lgtm_tblhnd_share->auto_increment_value;
+        } else {
+          DBUG_PRINT("info",("spider auto_increment_value=%llu",
+            share->lgtm_tblhnd_share->auto_increment_value));
+          stats.auto_increment_value =
+            share->lgtm_tblhnd_share->auto_increment_value;
+        }
+      } else {
+        stats.auto_increment_value =
+          share->lgtm_tblhnd_share->auto_increment_value;
+      }
+    }
+  }
+  if (flag & HA_STATUS_ERRKEY)
+    errkey = dup_key_idx;
+  DBUG_RETURN(0);
+}
+
+ha_rows ha_spider::records_in_range(
+  uint inx,
+  const key_range *start_key,
+  const key_range *end_key,
+  page_range *pages)
+{
+  int error_num;
+  THD *thd = ha_thd();
+  double crd_interval = spider_param_crd_interval(thd, share->crd_interval);
+  int crd_mode = spider_param_crd_mode(thd, share->crd_mode);
+  int crd_type = spider_param_crd_type(thd, share->crd_type);
+  int crd_sync = spider_param_crd_sync(thd, share->crd_sync);
+  int crd_bg_mode = spider_param_crd_bg_mode(thd, share->crd_bg_mode);
+  SPIDER_INIT_ERROR_TABLE *spider_init_error_table = NULL;
+  uint dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::records_in_range");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider inx=%u", inx));
+  time_t tmp_time = (time_t) time((time_t*) 0);
+  if (!share->crd_init)
+  {
+    pthread_mutex_lock(&share->crd_mutex);
+    if (share->crd_init)
+      pthread_mutex_unlock(&share->crd_mutex);
+    else {
+      if ((spider_init_error_table =
+        spider_get_init_error_table(wide_handler->trx, share, FALSE)))
+      {
+        DBUG_PRINT("info",("spider diff=%f",
+          difftime(tmp_time, spider_init_error_table->init_error_time)));
+        if (difftime(tmp_time,
+          spider_init_error_table->init_error_time) <
+          spider_param_table_init_error_interval())
+        {
+          pthread_mutex_unlock(&share->crd_mutex);
+          if (spider_init_error_table->init_error_with_message)
+            my_message(spider_init_error_table->init_error,
+              spider_init_error_table->init_error_msg, MYF(0));
+          if (check_error_mode(spider_init_error_table->init_error))
+            my_errno = spider_init_error_table->init_error;
+          DBUG_RETURN(HA_POS_ERROR);
+        }
+      }
+      pthread_mutex_unlock(&share->crd_mutex);
+      if (crd_mode == 3)
+        crd_mode = 1;
+      crd_interval = 0;
+    }
+  }
+  dbton_id = share->sql_dbton_ids[search_link_idx];
+  dbton_hdl = dbton_handler[dbton_id];
+  crd_mode = dbton_hdl->crd_mode_exchange(crd_mode);
+  /* This assertion simply demonstrates that the
+  static_key_cardinality field is unused. It will be deprecated
+  (MDEV-28861) and removed (MDEV-31146). */
+  DBUG_ASSERT(share->static_key_cardinality[inx] == -1);
+  if (crd_mode == 1 || crd_mode == 2)
+  {
+    DBUG_PRINT("info", ("spider static_key_cardinality[%u]=%lld", inx,
+      share->static_key_cardinality[inx]));
+    DBUG_PRINT("info",
+      ("spider difftime=%f", difftime(tmp_time, share->crd_get_time)));
+    DBUG_PRINT("info",
+      ("spider crd_interval=%f", crd_interval));
+    if (
+      share->static_key_cardinality[inx] == -1 &&
+      difftime(tmp_time, share->crd_get_time) >= crd_interval
+    ) {
+      if (!dml_inited)
+      {
+        if (unlikely((error_num = dml_init())))
+        {
+          if (check_error_mode(error_num))
+            my_errno = error_num;
+          DBUG_RETURN(HA_POS_ERROR);
+        }
+      }
+      if (
+        crd_interval == 0 ||
+        !pthread_mutex_trylock(&share->crd_mutex)
+      ) {
+        if (crd_interval == 0 || crd_bg_mode == 0)
+        {
+          if (crd_interval == 0)
+            pthread_mutex_lock(&share->crd_mutex);
+          if (difftime(tmp_time, share->crd_get_time) >= crd_interval)
+          {
+            if ((error_num = spider_get_crd(share, search_link_idx, tmp_time,
+              this, table, crd_interval, crd_mode,
+              crd_sync,
+              share->crd_init ? 2 : 1)))
+            {
+              pthread_mutex_unlock(&share->crd_mutex);
+              if (
+                share->monitoring_kind[search_link_idx] &&
+                need_mons[search_link_idx]
+              ) {
+                error_num = spider_ping_table_mon_from_table(
+                    wide_handler->trx,
+                    wide_handler->trx->thd,
+                    share,
+                    search_link_idx,
+                    (uint32) share->monitoring_sid[search_link_idx],
+                    share->table_name,
+                    share->table_name_length,
+                    conn_link_idx[search_link_idx],
+                    NULL,
+                    0,
+                    share->monitoring_kind[search_link_idx],
+                    share->monitoring_limit[search_link_idx],
+                    share->monitoring_flag[search_link_idx],
+                    TRUE
+                  );
+              }
+              if (!share->crd_init)
+              {
+                if (
+                  spider_init_error_table ||
+                  (spider_init_error_table =
+                    spider_get_init_error_table(wide_handler->trx,
+                      share, TRUE))
+                ) {
+                  spider_init_error_table->init_error = error_num;
+/*
+                  if (!thd->is_error())
+                    my_error(error_num, MYF(0), "");
+*/
+                  if ((spider_init_error_table->init_error_with_message =
+                    thd->is_error()))
+                    strmov(spider_init_error_table->init_error_msg,
+                      spider_stmt_da_message(thd));
+                  spider_init_error_table->init_error_time =
+                    (time_t) time((time_t*) 0);
+                }
+                share->init_error = TRUE;
+                share->init = TRUE;
+              }
+              if (check_error_mode(error_num))
+                my_errno = error_num;
+              DBUG_RETURN(HA_POS_ERROR);
+            }
+          }
+        } else if (crd_bg_mode == 1) {
+          /* background */
+          if (!share->bg_crd_init || share->bg_crd_thd_wait)
+          {
+            share->bg_crd_thd_wait = FALSE;
+            share->bg_crd_try_time = tmp_time;
+            share->bg_crd_interval = crd_interval;
+            share->bg_crd_mode = crd_mode;
+            share->bg_crd_sync = crd_sync;
+            if (!share->bg_crd_init)
+            {
+              if ((error_num = spider_create_crd_thread(share)))
+              {
+                pthread_mutex_unlock(&share->crd_mutex);
+                my_errno = error_num;
+                DBUG_RETURN(HA_POS_ERROR);
+              }
+            } else
+              pthread_cond_signal(&share->bg_crd_cond);
+          }
+        } else {
+          share->bg_crd_try_time = tmp_time;
+          share->bg_crd_interval = crd_interval;
+          share->bg_crd_mode = crd_mode;
+          share->bg_crd_sync = crd_sync;
+          spider_table_add_share_to_crd_thread(share);
+        }
+        pthread_mutex_unlock(&share->crd_mutex);
+      }
+    }
+
+    KEY *key_info = &table->key_info[inx];
+    key_part_map full_key_part_map =
+      make_prev_keypart_map(spider_user_defined_key_parts(key_info));
+    key_part_map start_key_part_map;
+    key_part_map end_key_part_map;
+    key_part_map tgt_key_part_map;
+    KEY_PART_INFO *key_part;
+    Field *field = NULL;
+    double rows = (double) share->stat.records;
+    double weight, rate;
+    DBUG_PRINT("info",("spider rows1=%f", rows));
+    if (start_key)
+      start_key_part_map = start_key->keypart_map & full_key_part_map;
+    else
+      start_key_part_map = 0;
+    if (end_key)
+      end_key_part_map = end_key->keypart_map & full_key_part_map;
+    else
+      end_key_part_map = 0;
+
+    if (!start_key_part_map && !end_key_part_map)
+    {
+      DBUG_RETURN(HA_POS_ERROR);
+    }
+    else if (start_key_part_map >= end_key_part_map)
+    {
+      tgt_key_part_map = start_key_part_map;
+    } else {
+      tgt_key_part_map = end_key_part_map;
+    }
+
+    if (crd_type == 0)
+      weight = spider_param_crd_weight(thd, share->crd_weight);
+    else
+      weight = 1;
+
+    if (share->static_key_cardinality[inx] == -1)
+    {
+      for (
+        key_part = key_info->key_part;
+        tgt_key_part_map > 1;
+        tgt_key_part_map >>= 1,
+        key_part++
+      ) {
+        field = key_part->field;
+        DBUG_PRINT("info",
+          ("spider field_index=%u",
+            field->field_index));
+        DBUG_PRINT("info",
+          ("spider cardinality=%lld", share->cardinality[field->field_index]));
+        if (share->cardinality[field->field_index] == -1)
+        {
+          DBUG_PRINT("info",
+            ("spider uninitialized column cardinality"));
+          DBUG_RETURN(HA_POS_ERROR);
+        }
+        if ((rate =
+          ((double) share->cardinality[field->field_index]) / weight) >= 1
+        ) {
+          if ((rows = rows / rate) < 2)
+          {
+            DBUG_PRINT("info",("spider rows2=%f then ret 2", rows));
+            DBUG_RETURN((ha_rows) 2);
+          }
+        }
+        if (crd_type == 1)
+          weight += spider_param_crd_weight(thd, share->crd_weight);
+        else if (crd_type == 2)
+          weight *= spider_param_crd_weight(thd, share->crd_weight);
+      }
+      field = key_part->field;
+      DBUG_PRINT("info",
+        ("spider field_index=%u",
+          field->field_index));
+      DBUG_PRINT("info",
+        ("spider cardinality=%lld", share->cardinality[field->field_index]));
+      if (share->cardinality[field->field_index] == -1)
+      {
+        DBUG_PRINT("info",
+          ("spider uninitialized column cardinality"));
+        DBUG_RETURN(HA_POS_ERROR);
+      }
+    }
+    if (
+      start_key_part_map >= end_key_part_map &&
+      start_key->flag == HA_READ_KEY_EXACT
+    ) {
+      if (share->static_key_cardinality[inx] == -1)
+      {
+        if ((rate =
+          ((double) share->cardinality[field->field_index]) / weight) >= 1)
+          rows = rows / rate;
+      } else {
+        rate = ((double) share->static_key_cardinality[inx]);
+        rows = rows / rate;
+      }
+    } else if (start_key_part_map == end_key_part_map)
+    {
+      if (share->static_key_cardinality[inx] == -1)
+      {
+        if ((rate =
+          ((double) share->cardinality[field->field_index]) / weight / 4) >= 1)
+          rows = rows / rate;
+      } else {
+        if ((rate =
+          ((double) share->static_key_cardinality[inx]) / 4) >= 1)
+          rows = rows / rate;
+      }
+    } else {
+      if (share->static_key_cardinality[inx] == -1)
+      {
+        if ((rate =
+          ((double) share->cardinality[field->field_index]) / weight / 16) >= 1)
+          rows = rows / rate;
+      } else {
+        if ((rate =
+          ((double) share->static_key_cardinality[inx]) / 16) >= 1)
+          rows = rows / rate;
+      }
+    }
+    if (rows < 2)
+    {
+      DBUG_PRINT("info",("spider rows3=%f then ret 2", rows));
+      DBUG_RETURN((ha_rows) 2);
+    }
+    DBUG_PRINT("info",("spider rows4=%f", rows));
+    DBUG_RETURN((ha_rows) rows);
+  } else if (crd_mode == 3)
+  {
+    if (!dml_inited)
+    {
+      if (unlikely((error_num = dml_init())))
+      {
+        if (check_error_mode(error_num))
+          my_errno = error_num;
+        DBUG_RETURN(HA_POS_ERROR);
+      }
+    }
+    result_list.key_info = &table->key_info[inx];
+    DBUG_RETURN(spider_db_explain_select(start_key, end_key, this,
+      search_link_idx));
+  }
+  DBUG_RETURN((ha_rows) spider_param_crd_weight(thd, share->crd_weight));
+}
+
+int ha_spider::check_crd()
+{
+  int error_num;
+  THD *thd = ha_thd();
+  double crd_interval = spider_param_crd_interval(thd, share->crd_interval);
+  int crd_mode = spider_param_crd_mode(thd, share->crd_mode);
+  int crd_sync = spider_param_crd_sync(thd, share->crd_sync);
+  int crd_bg_mode = spider_param_crd_bg_mode(thd, share->crd_bg_mode);
+  SPIDER_INIT_ERROR_TABLE *spider_init_error_table = NULL;
+  uint dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::check_crd");
+  DBUG_PRINT("info",("spider this=%p", this));
+  time_t tmp_time = (time_t) time((time_t*) 0);
+  if (!share->crd_init)
+  {
+    pthread_mutex_lock(&share->crd_mutex);
+    if (share->crd_init)
+      pthread_mutex_unlock(&share->crd_mutex);
+    else {
+      if ((spider_init_error_table =
+        spider_get_init_error_table(wide_handler->trx, share, FALSE)))
+      {
+        DBUG_PRINT("info",("spider diff=%f",
+          difftime(tmp_time, spider_init_error_table->init_error_time)));
+        if (difftime(tmp_time,
+          spider_init_error_table->init_error_time) <
+          spider_param_table_init_error_interval())
+        {
+          pthread_mutex_unlock(&share->crd_mutex);
+          if (spider_init_error_table->init_error_with_message)
+            my_message(spider_init_error_table->init_error,
+              spider_init_error_table->init_error_msg, MYF(0));
+          DBUG_RETURN(check_error_mode(spider_init_error_table->init_error));
+        }
+      }
+      pthread_mutex_unlock(&share->crd_mutex);
+      crd_interval = 0;
+    }
+  }
+  if (crd_mode == 3)
+    crd_mode = 1;
+  if ((error_num = spider_check_trx_and_get_conn(ha_thd(), this, FALSE)))
+  {
+    DBUG_RETURN(check_error_mode(error_num));
+  }
+  dbton_id = share->sql_dbton_ids[search_link_idx];
+  dbton_hdl = dbton_handler[dbton_id];
+  crd_mode = dbton_hdl->crd_mode_exchange(crd_mode);
+  DBUG_PRINT("info",
+    ("spider difftime=%f", difftime(tmp_time, share->crd_get_time)));
+  DBUG_PRINT("info",
+    ("spider crd_interval=%f", crd_interval));
+  if (difftime(tmp_time, share->crd_get_time) >= crd_interval)
+  {
+    if (
+      crd_interval == 0 ||
+      !pthread_mutex_trylock(&share->crd_mutex)
+    ) {
+      if (crd_interval == 0 || crd_bg_mode == 0)
+      {
+        if (crd_interval == 0)
+          pthread_mutex_lock(&share->crd_mutex);
+        if (difftime(tmp_time, share->crd_get_time) >= crd_interval)
+        {
+          if ((error_num = spider_get_crd(share, search_link_idx, tmp_time,
+            this, table, crd_interval, crd_mode,
+            crd_sync,
+            share->crd_init ? 2 : 1)))
+          {
+            pthread_mutex_unlock(&share->crd_mutex);
+            if (
+              share->monitoring_kind[search_link_idx] &&
+              need_mons[search_link_idx]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  search_link_idx,
+                  (uint32) share->monitoring_sid[search_link_idx],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[search_link_idx],
+                  NULL,
+                  0,
+                  share->monitoring_kind[search_link_idx],
+                  share->monitoring_limit[search_link_idx],
+                  share->monitoring_flag[search_link_idx],
+                  TRUE
+                );
+            }
+            if (!share->crd_init)
+            {
+              if (
+                spider_init_error_table ||
+                (spider_init_error_table =
+                  spider_get_init_error_table(wide_handler->trx, share, TRUE))
+              ) {
+                spider_init_error_table->init_error = error_num;
+                if ((spider_init_error_table->init_error_with_message =
+                  thd->is_error()))
+                  strmov(spider_init_error_table->init_error_msg,
+                    spider_stmt_da_message(thd));
+                spider_init_error_table->init_error_time =
+                  (time_t) time((time_t*) 0);
+              }
+              share->init_error = TRUE;
+              share->init = TRUE;
+            }
+            DBUG_RETURN(check_error_mode(error_num));
+          }
+        }
+      } else if (crd_bg_mode == 1) {
+        /* background */
+        if (!share->bg_crd_init || share->bg_crd_thd_wait)
+        {
+          share->bg_crd_thd_wait = FALSE;
+          share->bg_crd_try_time = tmp_time;
+          share->bg_crd_interval = crd_interval;
+          share->bg_crd_mode = crd_mode;
+          share->bg_crd_sync = crd_sync;
+          if (!share->bg_crd_init)
+          {
+            if ((error_num = spider_create_crd_thread(share)))
+            {
+              pthread_mutex_unlock(&share->crd_mutex);
+              DBUG_RETURN(error_num);
+            }
+          } else
+            pthread_cond_signal(&share->bg_crd_cond);
+        }
+      } else {
+        share->bg_crd_try_time = tmp_time;
+        share->bg_crd_interval = crd_interval;
+        share->bg_crd_mode = crd_mode;
+        share->bg_crd_sync = crd_sync;
+        spider_table_add_share_to_crd_thread(share);
+      }
+      pthread_mutex_unlock(&share->crd_mutex);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::pre_records()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::pre_records");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->sql_command == SQLCOM_ALTER_TABLE)
+  {
+    DBUG_RETURN(0);
+  }
+  if (!(share->additional_table_flags & HA_HAS_RECORDS))
+  {
+    DBUG_RETURN(0);
+  }
+  THD *thd = wide_handler->trx->thd;
+  if (
+    spider_param_sync_autocommit(thd) &&
+    (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
+  ) {
+    result_list.casual_read[search_link_idx] =
+      spider_param_casual_read(thd, share->casual_read);
+  }
+  if ((error_num = spider_db_simple_action(SPIDER_SIMPLE_RECORDS, this,
+    search_link_idx, TRUE)))
+  {
+    DBUG_RETURN(check_error_mode(error_num));
+  }
+  use_pre_action = TRUE;
+  DBUG_RETURN(0);
+}
+
+ha_rows ha_spider::records()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::records");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->sql_command == SQLCOM_ALTER_TABLE)
+  {
+    use_pre_action = FALSE;
+    DBUG_RETURN(0);
+  }
+  if (!(share->additional_table_flags & HA_HAS_RECORDS) && !this->result_list.direct_limit_offset)
+  {
+    DBUG_RETURN(handler::records());
+  }
+  if (!use_pre_action && !this->result_list.direct_limit_offset)
+  {
+    THD *thd = wide_handler->trx->thd;
+    if (
+      spider_param_sync_autocommit(thd) &&
+      (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
+    ) {
+      result_list.casual_read[search_link_idx] =
+        spider_param_casual_read(thd, share->casual_read);
+    }
+  }
+  if ((error_num = spider_db_simple_action(SPIDER_SIMPLE_RECORDS, this,
+    search_link_idx, FALSE)))
+  {
+    use_pre_action = FALSE;
+    check_error_mode(error_num);
+    DBUG_RETURN(HA_POS_ERROR);
+  }
+  use_pre_action = FALSE;
+  share->stat.records = table_rows;
+  DBUG_RETURN(table_rows);
+}
+
+int ha_spider::pre_calculate_checksum()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::pre_calculate_checksum");
+  DBUG_PRINT("info",("spider this=%p", this));
+  THD *thd = wide_handler->trx->thd;
+  if (!dml_inited)
+  {
+    if (unlikely((error_num = dml_init())))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+  if (
+    spider_param_sync_autocommit(thd) &&
+    (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
+  ) {
+    result_list.casual_read[search_link_idx] =
+      spider_param_casual_read(thd, share->casual_read);
+  }
+  action_flags = T_EXTEND;
+  if ((error_num = spider_db_simple_action(SPIDER_SIMPLE_CHECKSUM_TABLE, this,
+    search_link_idx, TRUE)))
+  {
+    DBUG_RETURN(check_error_mode(error_num));
+  }
+  use_pre_action = TRUE;
+  DBUG_RETURN(0);
+}
+
+int ha_spider::calculate_checksum()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::calculate_checksum");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!dml_inited)
+  {
+    if (unlikely((error_num = dml_init())))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+  if (!use_pre_action && !this->result_list.direct_limit_offset)
+  {
+    THD *thd = wide_handler->trx->thd;
+    if (
+      spider_param_sync_autocommit(thd) &&
+      (!thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
+    ) {
+      result_list.casual_read[search_link_idx] =
+        spider_param_casual_read(thd, share->casual_read);
+    }
+  }
+  action_flags = T_EXTEND;
+  if ((error_num = spider_db_simple_action(SPIDER_SIMPLE_CHECKSUM_TABLE, this,
+    search_link_idx, FALSE)))
+  {
+    use_pre_action = FALSE;
+    DBUG_RETURN(check_error_mode(error_num));
+  }
+  use_pre_action = FALSE;
+  if (checksum_null)
+  {
+    share->stat.checksum_null = TRUE;
+    share->stat.checksum = 0;
+    stats.checksum_null = TRUE;
+    stats.checksum = 0;
+  } else {
+    share->stat.checksum_null = FALSE;
+    share->stat.checksum = (ha_checksum) checksum_val;
+    stats.checksum_null = FALSE;
+    stats.checksum = (ha_checksum) checksum_val;
+  }
+  DBUG_RETURN(0);
+}
+
+const char *ha_spider::table_type() const
+{
+  DBUG_ENTER("ha_spider::table_type");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN("SPIDER");
+}
+
+ulonglong ha_spider::table_flags() const
+{
+  DBUG_ENTER("ha_spider::table_flags");
+  DBUG_PRINT("info",("spider this=%p", this));
+  ulonglong flags =
+    HA_REC_NOT_IN_SEQ |
+    HA_CAN_GEOMETRY |
+    HA_NULL_IN_KEY |
+    HA_CAN_INDEX_BLOBS |
+    HA_AUTO_PART_KEY |
+    HA_CAN_RTREEKEYS |
+    HA_PRIMARY_KEY_REQUIRED_FOR_DELETE |
+    /* HA_NO_PREFIX_CHAR_KEYS | */
+    HA_CAN_FULLTEXT |
+    HA_CAN_SQL_HANDLER |
+    HA_FILE_BASED |
+    HA_CAN_BIT_FIELD |
+    HA_NO_COPY_ON_ALTER |
+    HA_BINLOG_ROW_CAPABLE |
+    HA_BINLOG_STMT_CAPABLE |
+    HA_PARTIAL_COLUMN_READ |
+#ifdef HA_SLOW_CMP_REF
+    HA_SLOW_CMP_REF |
+#endif
+#ifdef SPIDER_ENGINE_CONDITION_PUSHDOWN_IS_ALWAYS_ON
+    HA_CAN_TABLE_CONDITION_PUSHDOWN |
+#endif
+    SPIDER_CAN_BG_SEARCH |
+    SPIDER_CAN_BG_INSERT |
+    SPIDER_CAN_BG_UPDATE |
+#ifdef HA_CAN_DIRECT_UPDATE_AND_DELETE
+    HA_CAN_DIRECT_UPDATE_AND_DELETE |
+#endif
+#ifdef HA_CAN_FORCE_BULK_UPDATE
+    (share && share->force_bulk_update ? HA_CAN_FORCE_BULK_UPDATE : 0) |
+#endif
+#ifdef HA_CAN_FORCE_BULK_DELETE
+    (share && share->force_bulk_delete ? HA_CAN_FORCE_BULK_DELETE : 0) |
+#endif
+    (share ? share->additional_table_flags : 0)
+  ;
+  DBUG_RETURN(flags);
+}
+
+ulong ha_spider::table_flags_for_partition()
+{
+  DBUG_ENTER("ha_spider::table_flags_for_partition");
+  DBUG_PRINT("info",("spider this=%p", this));
+  ulong flags =
+#ifdef HA_PT_CALL_AT_ONCE_STORE_LOCK
+    HA_PT_CALL_AT_ONCE_STORE_LOCK |
+#endif
+#ifdef HA_PT_CALL_AT_ONCE_EXTERNAL_LOCK
+    HA_PT_CALL_AT_ONCE_EXTERNAL_LOCK |
+#endif
+#ifdef HA_PT_CALL_AT_ONCE_START_STMT
+    HA_PT_CALL_AT_ONCE_START_STMT |
+#endif
+#ifdef HA_PT_CALL_AT_ONCE_EXTRA
+    HA_PT_CALL_AT_ONCE_EXTRA |
+#endif
+#ifdef HA_PT_CALL_AT_ONCE_COND_PUSH
+    HA_PT_CALL_AT_ONCE_COND_PUSH |
+#endif
+#ifdef HA_PT_CALL_AT_ONCE_INFO_PUSH
+    HA_PT_CALL_AT_ONCE_INFO_PUSH |
+#endif
+#ifdef HA_PT_CALL_AT_ONCE_TOP_TABLE
+    HA_PT_CALL_AT_ONCE_TOP_TABLE |
+#endif
+    0;
+  DBUG_RETURN(flags);
+}
+
+const char *ha_spider::index_type(
+  uint key_number
+) {
+  KEY *key_info = &table->key_info[key_number];
+  DBUG_ENTER("ha_spider::index_type");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider flags=%ld", key_info->flags));
+  DBUG_PRINT("info",("spider algorithm=%d", key_info->algorithm));
+  DBUG_RETURN(
+    (key_info->flags & HA_FULLTEXT) ? "FULLTEXT" :
+    (key_info->flags & HA_SPATIAL) ? "SPATIAL" :
+    (key_info->algorithm == HA_KEY_ALG_HASH) ? "HASH" :
+    (key_info->algorithm == HA_KEY_ALG_RTREE) ? "RTREE" :
+    "BTREE"
+  );
+}
+
+ulong ha_spider::index_flags(
+  uint idx,
+  uint part,
+  bool all_parts
+) const {
+  DBUG_ENTER("ha_spider::index_flags");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(
+    (table_share->key_info[idx].algorithm == HA_KEY_ALG_FULLTEXT) ?
+      0 :
+    (table_share->key_info[idx].algorithm == HA_KEY_ALG_HASH) ?
+      HA_ONLY_WHOLE_INDEX | HA_KEY_SCAN_NOT_ROR :
+    HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | HA_READ_RANGE |
+    HA_KEYREAD_ONLY
+  );
+}
+
+uint ha_spider::max_supported_record_length() const
+{
+  DBUG_ENTER("ha_spider::max_supported_record_length");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(HA_MAX_REC_LENGTH);
+}
+
+uint ha_spider::max_supported_keys() const
+{
+  DBUG_ENTER("ha_spider::max_supported_keys");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(MAX_KEY);
+}
+
+uint ha_spider::max_supported_key_parts() const
+{
+  DBUG_ENTER("ha_spider::max_supported_key_parts");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(MAX_REF_PARTS);
+}
+
+uint ha_spider::max_supported_key_length() const
+{
+  DBUG_ENTER("ha_spider::max_supported_key_length");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(SPIDER_MAX_KEY_LENGTH);
+}
+
+uint ha_spider::max_supported_key_part_length() const
+{
+  DBUG_ENTER("ha_spider::max_supported_key_part_length");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(SPIDER_MAX_KEY_LENGTH);
+}
+
+uint8 ha_spider::table_cache_type()
+{
+  DBUG_ENTER("ha_spider::table_cache_type");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(HA_CACHE_TBL_NOCACHE);
+}
+
+bool ha_spider::need_info_for_auto_inc()
+{
+  THD *thd = ha_thd();
+  DBUG_ENTER("ha_spider::need_info_for_auto_inc");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider return=%s", (
+    !share->lgtm_tblhnd_share->auto_increment_init ||
+    (
+      !spider_param_auto_increment_mode(thd, share->auto_increment_mode) &&
+      !info_auto_called
+    )
+  ) ? "TRUE" : "FALSE"));
+  DBUG_RETURN((
+    !share->lgtm_tblhnd_share->auto_increment_init ||
+    (
+      !spider_param_auto_increment_mode(thd, share->auto_increment_mode) &&
+      !info_auto_called
+    )
+  ));
+}
+
+#ifdef HANDLER_HAS_CAN_USE_FOR_AUTO_INC_INIT
+bool ha_spider::can_use_for_auto_inc_init()
+{
+  DBUG_ENTER("ha_spider::can_use_for_auto_inc_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider return=%s", (
+    !auto_inc_temporary
+  ) ? "TRUE" : "FALSE"));
+  DBUG_RETURN((
+    !auto_inc_temporary
+  ));
+}
+#endif
+
+int ha_spider::update_auto_increment()
+{
+  int error_num;
+  THD *thd = ha_thd();
+  int auto_increment_mode = spider_param_auto_increment_mode(thd,
+    share->auto_increment_mode);
+  bool lock_here = FALSE;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::update_auto_increment");
+  DBUG_PRINT("info",("spider this=%p", this));
+  force_auto_increment = TRUE;
+/*
+  if (
+    next_insert_id >= auto_inc_interval_for_cur_row.maximum() &&
+    wide_handler->trx->thd->auto_inc_intervals_forced.get_current()
+  ) {
+    force_auto_increment = TRUE;
+    DBUG_PRINT("info",("spider force_auto_increment=TRUE"));
+  } else {
+    force_auto_increment = FALSE;
+    DBUG_PRINT("info",("spider force_auto_increment=FALSE"));
+  }
+*/
+  DBUG_PRINT("info",("spider auto_increment_mode=%d",
+    auto_increment_mode));
+  DBUG_PRINT("info",("spider next_number_field=%lld",
+    table->next_number_field->val_int()));
+  if (
+    auto_increment_mode == 1 &&
+    !(
+      table->next_number_field->val_int() != 0 ||
+      (table->auto_increment_field_not_null &&
+        thd->variables.sql_mode & MODE_NO_AUTO_VALUE_ON_ZERO)
+    )
+  ) {
+    lock_here = TRUE;
+    pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+    next_insert_id = share->lgtm_tblhnd_share->auto_increment_value;
+    DBUG_PRINT("info",("spider auto_increment_value=%llu",
+      share->lgtm_tblhnd_share->auto_increment_value));
+  }
+  if ((error_num = handler::update_auto_increment()))
+  {
+    if (lock_here)
+      pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+    DBUG_RETURN(check_error_mode(error_num));
+  }
+  if (lock_here)
+  {
+    if (insert_id_for_cur_row)
+    {
+      share->lgtm_tblhnd_share->auto_increment_lclval =
+        insert_id_for_cur_row + 1;
+      share->lgtm_tblhnd_share->auto_increment_value = next_insert_id;
+      DBUG_PRINT("info",("spider after auto_increment_lclval=%llu",
+        share->lgtm_tblhnd_share->auto_increment_lclval));
+      DBUG_PRINT("info",("spider auto_increment_value=%llu",
+        share->lgtm_tblhnd_share->auto_increment_value));
+    }
+    pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+  }
+  if (!store_last_insert_id)
+  {
+    store_last_insert_id = table->next_number_field->val_int();
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::get_auto_increment(
+  ulonglong offset,
+  ulonglong increment,
+  ulonglong nb_desired_values,
+  ulonglong *first_value,
+  ulonglong *nb_reserved_values
+) {
+  THD *thd = ha_thd();
+  int auto_increment_mode = spider_param_auto_increment_mode(thd,
+    share->auto_increment_mode);
+  bool rev= table->key_info[table->s->next_number_index].
+              key_part[table->s->next_number_keypart].key_part_flag &
+                HA_REVERSE_SORT;
+  DBUG_ENTER("ha_spider::get_auto_increment");
+  DBUG_PRINT("info",("spider this=%p", this));
+  *nb_reserved_values = ULONGLONG_MAX;
+  if (auto_increment_mode == 0)
+  {
+    /* strict mode */
+    int error_num;
+    extra(HA_EXTRA_KEYREAD);
+    if (index_init(table_share->next_number_index, TRUE))
+      goto error_index_init;
+    result_list.internal_limit = 1;
+    if (table_share->next_number_keypart)
+    {
+      uchar key[MAX_KEY_LENGTH];
+      key_copy(key, table->record[0],
+        &table->key_info[table_share->next_number_index],
+        table_share->next_number_key_offset);
+      error_num = index_read_last_map(table->record[1], key,
+        make_prev_keypart_map(table_share->next_number_keypart));
+    } else if (rev)
+      error_num = index_first(table->record[1]);
+    else
+      error_num = index_last(table->record[1]);
+
+    if (error_num)
+      *first_value = 1;
+    else
+      *first_value = ((ulonglong) table->next_number_field->
+        val_int_offset(table_share->rec_buff_length) + 1);
+    index_end();
+    extra(HA_EXTRA_NO_KEYREAD);
+    DBUG_VOID_RETURN;
+
+error_index_init:
+    extra(HA_EXTRA_NO_KEYREAD);
+    *first_value = ~(ulonglong)0;
+    DBUG_VOID_RETURN;
+  } else {
+    if (auto_increment_mode != 1)
+      pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+    DBUG_PRINT("info",("spider before auto_increment_lclval=%llu",
+      share->lgtm_tblhnd_share->auto_increment_lclval));
+    *first_value = share->lgtm_tblhnd_share->auto_increment_lclval;
+    share->lgtm_tblhnd_share->auto_increment_lclval +=
+      nb_desired_values * increment;
+    DBUG_PRINT("info",("spider after auto_increment_lclval=%llu",
+      share->lgtm_tblhnd_share->auto_increment_lclval));
+    if (auto_increment_mode != 1)
+      pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::reset_auto_increment(
+  ulonglong value
+) {
+  DBUG_ENTER("ha_spider::reset_auto_increment");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (table->next_number_field)
+  {
+    pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+    share->lgtm_tblhnd_share->auto_increment_lclval = value;
+    share->lgtm_tblhnd_share->auto_increment_init = TRUE;
+    DBUG_PRINT("info",("spider init auto_increment_lclval=%llu",
+      share->lgtm_tblhnd_share->auto_increment_lclval));
+    pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::release_auto_increment()
+{
+  DBUG_ENTER("ha_spider::release_auto_increment");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::start_bulk_insert(
+  ha_rows rows,
+  uint flags
+)
+{
+  DBUG_ENTER("ha_spider::start_bulk_insert");
+  DBUG_PRINT("info",("spider this=%p", this));
+  bulk_insert = TRUE;
+  bulk_size = -1;
+  store_last_insert_id = 0;
+  bzero(&copy_info, sizeof(copy_info));
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::end_bulk_insert()
+{
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::end_bulk_insert");
+  DBUG_PRINT("info",("spider this=%p", this));
+  bulk_insert = FALSE;
+  if (bulk_size == -1)
+    DBUG_RETURN(0);
+  if ((error_num = spider_db_bulk_insert(this, table, &copy_info, TRUE)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::write_row(
+  const uchar *buf
+) {
+  int error_num;
+  THD *thd = ha_thd();
+  int auto_increment_mode = spider_param_auto_increment_mode(thd,
+    share->auto_increment_mode);
+  bool auto_increment_flag =
+    table->next_number_field && buf == table->record[0];
+  backup_error_status();
+  DBUG_ENTER("ha_spider::write_row");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (spider_param_read_only_mode(thd, share->read_only_mode))
+  {
+    my_printf_error(ER_SPIDER_READ_ONLY_NUM, ER_SPIDER_READ_ONLY_STR, MYF(0),
+      table_share->db.str, table_share->table_name.str);
+    DBUG_RETURN(ER_SPIDER_READ_ONLY_NUM);
+  }
+  if (!dml_inited)
+  {
+    if (unlikely((error_num = dml_init())))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+#ifndef SPIDER_WITHOUT_HA_STATISTIC_INCREMENT
+  ha_statistic_increment(&SSV::ha_write_count);
+#endif
+  if (!bulk_insert)
+    store_last_insert_id = 0;
+  if (auto_increment_flag)
+  {
+    if (auto_increment_mode == 3)
+    {
+      if (!table->auto_increment_field_not_null)
+      {
+#ifndef DBUG_OFF
+        MY_BITMAP *tmp_map =
+          dbug_tmp_use_all_columns(table, &table->write_set);
+#endif
+        table->next_number_field->store((longlong) 0, TRUE);
+#ifndef DBUG_OFF
+        dbug_tmp_restore_column_map(&table->write_set, tmp_map);
+#endif
+        force_auto_increment = FALSE;
+        table->file->insert_id_for_cur_row = 0;
+      }
+    } else if (auto_increment_mode == 2)
+    {
+#ifndef DBUG_OFF
+      MY_BITMAP *tmp_map =
+        dbug_tmp_use_all_columns(table, &table->write_set);
+#endif
+      table->next_number_field->store((longlong) 0, TRUE);
+      table->auto_increment_field_not_null = FALSE;
+#ifndef DBUG_OFF
+      dbug_tmp_restore_column_map(&table->write_set, tmp_map);
+#endif
+      force_auto_increment = FALSE;
+      table->file->insert_id_for_cur_row = 0;
+    } else {
+      if (!share->lgtm_tblhnd_share->auto_increment_init)
+      {
+        pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+        if (!share->lgtm_tblhnd_share->auto_increment_init)
+        {
+          info(HA_STATUS_AUTO);
+          share->lgtm_tblhnd_share->auto_increment_lclval =
+            stats.auto_increment_value;
+          share->lgtm_tblhnd_share->auto_increment_init = TRUE;
+          DBUG_PRINT("info",("spider init auto_increment_lclval=%llu",
+            share->lgtm_tblhnd_share->auto_increment_lclval));
+        }
+        pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+      }
+      if ((error_num = update_auto_increment()))
+        DBUG_RETURN(error_num);
+    }
+  }
+  if (!bulk_insert || bulk_size < 0)
+  {
+    direct_dup_insert =
+      spider_param_direct_dup_insert(wide_handler->trx->thd,
+        share->direct_dup_insert);
+    DBUG_PRINT("info",("spider direct_dup_insert=%d", direct_dup_insert));
+    if ((error_num = spider_db_bulk_insert_init(this, table)))
+      DBUG_RETURN(check_error_mode(error_num));
+    if (bulk_insert)
+      bulk_size =
+        (wide_handler->insert_with_update &&
+          !result_list.insert_dup_update_pushdown) ||
+        (!direct_dup_insert && wide_handler->ignore_dup_key) ?
+        0 : spider_param_bulk_size(wide_handler->trx->thd, share->bulk_size);
+    else
+      bulk_size = 0;
+  }
+  if ((error_num = spider_db_bulk_insert(this, table, &copy_info, FALSE)))
+    DBUG_RETURN(check_error_mode(error_num));
+
+  DBUG_RETURN(0);
+}
+
+
+void ha_spider::direct_update_init(
+  THD *thd,
+  bool hs_request
+) {
+  DBUG_ENTER("ha_spider::direct_update_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  do_direct_update = TRUE;
+  DBUG_VOID_RETURN;
+}
+
+bool ha_spider::start_bulk_update(
+) {
+  DBUG_ENTER("ha_spider::start_bulk_update");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(check_and_start_bulk_update(SPD_BU_START_BY_BULK_INIT));
+}
+
+int ha_spider::exec_bulk_update(
+  ha_rows *dup_key_found
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::exec_bulk_update");
+  DBUG_PRINT("info",("spider this=%p", this));
+  *dup_key_found = 0;
+  if ((error_num = spider_db_bulk_update_end(this, dup_key_found)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::end_bulk_update(
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::end_bulk_update");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = check_and_end_bulk_update(SPD_BU_START_BY_BULK_INIT)))
+  {
+    if (check_error_mode(error_num))
+      DBUG_RETURN(error_num);
+  }
+  DBUG_RETURN(0);
+}
+
+#ifdef SPIDER_UPDATE_ROW_HAS_CONST_NEW_DATA
+int ha_spider::bulk_update_row(
+  const uchar *old_data,
+  const uchar *new_data,
+  ha_rows *dup_key_found
+)
+#else
+int ha_spider::bulk_update_row(
+  const uchar *old_data,
+  uchar *new_data,
+  ha_rows *dup_key_found
+)
+#endif
+{
+  DBUG_ENTER("ha_spider::bulk_update_row");
+  DBUG_PRINT("info",("spider this=%p", this));
+  *dup_key_found = 0;
+  DBUG_RETURN(update_row(old_data, new_data));
+}
+
+#ifdef SPIDER_UPDATE_ROW_HAS_CONST_NEW_DATA
+int ha_spider::update_row(
+  const uchar *old_data,
+  const uchar *new_data
+)
+#else
+int ha_spider::update_row(
+  const uchar *old_data,
+  uchar *new_data
+)
+#endif
+{
+  int error_num;
+  THD *thd = ha_thd();
+  backup_error_status();
+  DBUG_ENTER("ha_spider::update_row");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (spider_param_read_only_mode(thd, share->read_only_mode))
+  {
+    my_printf_error(ER_SPIDER_READ_ONLY_NUM, ER_SPIDER_READ_ONLY_STR, MYF(0),
+      table_share->db.str, table_share->table_name.str);
+    DBUG_RETURN(ER_SPIDER_READ_ONLY_NUM);
+  }
+#ifndef SPIDER_WITHOUT_HA_STATISTIC_INCREMENT
+  ha_statistic_increment(&SSV::ha_update_count);
+#endif
+  do_direct_update = FALSE;
+  if ((error_num = spider_db_update(this, table, old_data)))
+    DBUG_RETURN(check_error_mode(error_num));
+  if (table->found_next_number_field &&
+    new_data == table->record[0] &&
+    !table->s->next_number_keypart
+  ) {
+    pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+    if (!share->lgtm_tblhnd_share->auto_increment_init)
+    {
+      info(HA_STATUS_AUTO);
+      share->lgtm_tblhnd_share->auto_increment_lclval =
+        stats.auto_increment_value;
+      share->lgtm_tblhnd_share->auto_increment_init = TRUE;
+      DBUG_PRINT("info",("spider init auto_increment_lclval=%llu",
+        share->lgtm_tblhnd_share->auto_increment_lclval));
+    }
+    ulonglong tmp_auto_increment;
+    if (((Field_num *) table->found_next_number_field)->unsigned_flag)
+    {
+      tmp_auto_increment =
+        (ulonglong) table->found_next_number_field->val_int();
+    } else {
+      longlong tmp_auto_increment2 =
+        table->found_next_number_field->val_int();
+      if (tmp_auto_increment2 > 0)
+        tmp_auto_increment = tmp_auto_increment2;
+      else
+        tmp_auto_increment = 0;
+    }
+    if (tmp_auto_increment >= share->lgtm_tblhnd_share->auto_increment_lclval)
+    {
+      share->lgtm_tblhnd_share->auto_increment_lclval = tmp_auto_increment + 1;
+      share->lgtm_tblhnd_share->auto_increment_value = tmp_auto_increment + 1;
+      DBUG_PRINT("info",("spider after auto_increment_lclval=%llu",
+        share->lgtm_tblhnd_share->auto_increment_lclval));
+      DBUG_PRINT("info",("spider auto_increment_value=%llu",
+        share->lgtm_tblhnd_share->auto_increment_value));
+    }
+    pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+  }
+  DBUG_RETURN(0);
+}
+
+bool ha_spider::check_direct_update_sql_part(
+  st_select_lex *select_lex,
+  longlong select_limit,
+  longlong offset_limit
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::check_direct_update_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      dbton_hdl->check_direct_update(select_lex, select_limit, offset_limit)
+    ) {
+      DBUG_RETURN(TRUE);
+    }
+  }
+  DBUG_RETURN(FALSE);
+}
+
+/**
+  Perform initialization for a direct update request.
+
+  @param  update fields       Pointer to the list of fields to update.
+
+  @return >0                  Error.
+          0                   Success.
+*/
+
+int ha_spider::direct_update_rows_init(
+  List<Item> *update_fields
+)
+{
+  st_select_lex *select_lex;
+  longlong select_limit;
+  longlong offset_limit;
+  List_iterator<Item> it(*wide_handler->direct_update_fields);
+  Item *item;
+  Field *field;
+  THD *thd = wide_handler->trx->thd;
+  DBUG_ENTER("ha_spider::direct_update_rows_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (thd->variables.time_zone != UTC)
+  {
+    while ((item = it++))
+    {
+      if (item->type() == Item::FIELD_ITEM)
+      {
+        field = ((Item_field *)item)->field;
+
+        if (field->type() == FIELD_TYPE_TIMESTAMP &&
+            field->flags & UNIQUE_KEY_FLAG)
+        {
+          /*
+            Spider cannot perform direct update on unique timestamp fields.
+            To avoid false duplicate key errors, the table needs to be
+            updated one row at a time.
+          */
+          DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+        }
+      }
+    }
+  }
+  if (!dml_inited)
+  {
+    if (unlikely(dml_init()))
+    {
+      DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+    }
+  }
+  direct_update_init(
+    thd,
+    FALSE
+  );
+  if (!wide_handler->condition)
+    wide_handler->cond_check = FALSE;
+  spider_get_select_limit(this, &select_lex, &select_limit, &offset_limit);
+  if (wide_handler->direct_update_fields)
+  {
+    if (
+#ifdef SPIDER_ENGINE_CONDITION_PUSHDOWN_IS_ALWAYS_ON
+#else
+      !(thd->variables.optimizer_switch &
+        OPTIMIZER_SWITCH_ENGINE_CONDITION_PUSHDOWN) ||
+#endif
+      !select_lex ||
+      select_lex->table_list.elements != 1 ||
+      check_update_columns_sql_part() ||
+      check_direct_update_sql_part(select_lex, select_limit, offset_limit) ||
+      spider_db_append_condition(this, NULL, 0, TRUE)
+    ) {
+      DBUG_PRINT("info",("spider FALSE by condition"));
+      do_direct_update = FALSE;
+      DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+    }
+    if (select_lex->order_list.elements)
+    {
+      ORDER *order;
+      for (order = (ORDER *) select_lex->order_list.first; order;
+        order = order->next)
+      {
+        if (check_item_type_sql((*order->item)))
+        {
+          DBUG_PRINT("info",("spider FALSE by order"));
+          do_direct_update = FALSE;
+          DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+        }
+      }
+      result_list.direct_order_limit = TRUE;
+    }
+    wide_handler->trx->direct_update_count++;
+    DBUG_PRINT("info",("spider OK"));
+    DBUG_RETURN(0);
+  }
+
+  DBUG_PRINT("info",("spider offset_limit=%lld", offset_limit));
+  DBUG_PRINT("info",("spider sql_command=%u", wide_handler->sql_command));
+  DBUG_PRINT("info",("spider do_direct_update=%s",
+    do_direct_update ? "TRUE" : "FALSE"));
+  if (
+    !offset_limit &&
+    do_direct_update
+  ) {
+    wide_handler->trx->direct_update_count++;
+    DBUG_PRINT("info",("spider OK"));
+    DBUG_RETURN(0);
+  }
+  DBUG_PRINT("info",("spider FALSE by default"));
+  do_direct_update = FALSE;
+  DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+}
+
+
+int ha_spider::direct_update_rows(
+  ha_rows *update_rows,
+  ha_rows *found_rows
+) {
+  int error_num;
+  THD *thd = ha_thd();
+  backup_error_status();
+  DBUG_ENTER("ha_spider::direct_update_rows");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (spider_param_read_only_mode(thd, share->read_only_mode))
+  {
+    my_printf_error(ER_SPIDER_READ_ONLY_NUM, ER_SPIDER_READ_ONLY_STR, MYF(0),
+      table_share->db.str, table_share->table_name.str);
+    DBUG_RETURN(ER_SPIDER_READ_ONLY_NUM);
+  }
+  if ((error_num=
+           spider_db_direct_update(this, table, update_rows, found_rows)))
+    DBUG_RETURN(check_error_mode(error_num));
+
+  DBUG_RETURN(0);
+}
+
+
+bool ha_spider::start_bulk_delete(
+) {
+  DBUG_ENTER("ha_spider::start_bulk_delete");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(check_and_start_bulk_update(SPD_BU_START_BY_BULK_INIT));
+}
+
+int ha_spider::end_bulk_delete(
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::end_bulk_delete");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = check_and_end_bulk_update(SPD_BU_START_BY_BULK_INIT)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::delete_row(
+  const uchar *buf
+) {
+  THD *thd = ha_thd();
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::delete_row");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (spider_param_read_only_mode(thd, share->read_only_mode))
+  {
+    my_printf_error(ER_SPIDER_READ_ONLY_NUM, ER_SPIDER_READ_ONLY_STR, MYF(0),
+      table_share->db.str, table_share->table_name.str);
+    DBUG_RETURN(ER_SPIDER_READ_ONLY_NUM);
+  }
+#ifndef SPIDER_WITHOUT_HA_STATISTIC_INCREMENT
+  ha_statistic_increment(&SSV::ha_delete_count);
+#endif
+  do_direct_update = FALSE;
+  if ((error_num = spider_db_delete(this, table, buf)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+bool ha_spider::check_direct_delete_sql_part(
+  st_select_lex *select_lex,
+  longlong select_limit,
+  longlong offset_limit
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::check_direct_delete_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      dbton_hdl->check_direct_delete(select_lex, select_limit, offset_limit)
+    ) {
+      DBUG_RETURN(TRUE);
+    }
+  }
+  DBUG_RETURN(FALSE);
+}
+
+int ha_spider::direct_delete_rows_init()
+{
+  st_select_lex *select_lex;
+  longlong select_limit;
+  longlong offset_limit;
+  THD *thd = wide_handler->trx->thd;
+  DBUG_ENTER("ha_spider::direct_delete_rows_init");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!dml_inited)
+  {
+    if (unlikely(dml_init()))
+    {
+      DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+    }
+  }
+  direct_update_init(
+    thd,
+    FALSE
+  );
+  if (!wide_handler->condition)
+    wide_handler->cond_check = FALSE;
+  spider_get_select_limit(this, &select_lex, &select_limit, &offset_limit);
+  if (
+#ifdef SPIDER_ENGINE_CONDITION_PUSHDOWN_IS_ALWAYS_ON
+#else
+    !(thd->variables.optimizer_switch &
+      OPTIMIZER_SWITCH_ENGINE_CONDITION_PUSHDOWN) ||
+#endif
+    !select_lex ||
+    select_lex->table_list.elements != 1 ||
+    check_direct_delete_sql_part(select_lex, select_limit, offset_limit) ||
+    spider_db_append_condition(this, NULL, 0, TRUE)
+  ) {
+    DBUG_PRINT("info",("spider FALSE by condition"));
+    do_direct_update = FALSE;
+    DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+  }
+  if (select_lex->order_list.elements)
+  {
+    ORDER *order;
+    for (order = (ORDER *) select_lex->order_list.first; order;
+      order = order->next)
+    {
+      if (check_item_type_sql((*order->item)))
+      {
+        DBUG_PRINT("info",("spider FALSE by order"));
+        do_direct_update = FALSE;
+        DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+      }
+    }
+    result_list.direct_order_limit = TRUE;
+  }
+  wide_handler->trx->direct_delete_count++;
+  DBUG_PRINT("info",("spider OK"));
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::direct_delete_rows(
+  ha_rows *delete_rows
+) {
+  int error_num;
+  THD *thd = ha_thd();
+  backup_error_status();
+  DBUG_ENTER("ha_spider::direct_delete_rows");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (spider_param_read_only_mode(thd, share->read_only_mode))
+  {
+    my_printf_error(ER_SPIDER_READ_ONLY_NUM, ER_SPIDER_READ_ONLY_STR, MYF(0),
+      table_share->db.str, table_share->table_name.str);
+    DBUG_RETURN(ER_SPIDER_READ_ONLY_NUM);
+  }
+  if ((error_num= spider_db_direct_delete(this, table, delete_rows)))
+    DBUG_RETURN(check_error_mode(error_num));
+
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::delete_all_rows()
+{
+  THD *thd = ha_thd();
+  DBUG_ENTER("ha_spider::delete_all_rows");
+  if (spider_param_delete_all_rows_type(thd, share->delete_all_rows_type))
+    DBUG_RETURN(HA_ERR_WRONG_COMMAND);
+  DBUG_RETURN(truncate());
+}
+
+int ha_spider::truncate()
+{
+  int error_num;
+  THD *thd = ha_thd();
+  backup_error_status();
+  DBUG_ENTER("ha_spider::truncate");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (spider_param_read_only_mode(thd, share->read_only_mode))
+  {
+    my_printf_error(ER_SPIDER_READ_ONLY_NUM, ER_SPIDER_READ_ONLY_STR, MYF(0),
+      table_share->db.str, table_share->table_name.str);
+    DBUG_RETURN(ER_SPIDER_READ_ONLY_NUM);
+  }
+  wide_handler->sql_command = SQLCOM_TRUNCATE;
+  if ((error_num = spider_check_trx_and_get_conn(thd, this, FALSE)))
+  {
+    DBUG_RETURN(error_num);
+  }
+  do_direct_update = FALSE;
+  if ((error_num = spider_db_delete_all_rows(this)))
+    DBUG_RETURN(check_error_mode(error_num));
+  if (wide_handler->sql_command == SQLCOM_TRUNCATE &&
+    table->found_next_number_field)
+  {
+    DBUG_PRINT("info",("spider reset auto increment"));
+    pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+    share->lgtm_tblhnd_share->auto_increment_lclval = 1;
+    share->lgtm_tblhnd_share->auto_increment_init = FALSE;
+    share->lgtm_tblhnd_share->auto_increment_value = 1;
+    DBUG_PRINT("info",("spider init auto_increment_lclval=%llu",
+      share->lgtm_tblhnd_share->auto_increment_lclval));
+    DBUG_PRINT("info",("spider auto_increment_value=%llu",
+      share->lgtm_tblhnd_share->auto_increment_value));
+    pthread_mutex_unlock(&share->lgtm_tblhnd_share->auto_increment_mutex);
+  }
+  DBUG_RETURN(0);
+}
+
+
+double ha_spider::scan_time()
+{
+  DBUG_ENTER("ha_spider::scan_time");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider scan_time = %.6f",
+    share->scan_rate * share->stat.records * share->stat.mean_rec_length + 2));
+  DBUG_RETURN(share->scan_rate * share->stat.records *
+    share->stat.mean_rec_length + 2);
+}
+
+double ha_spider::read_time(
+  uint index,
+  uint ranges,
+  ha_rows rows
+) {
+  DBUG_ENTER("ha_spider::read_time");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler->keyread)
+  {
+    DBUG_PRINT("info",("spider read_time(keyread) = %.6f",
+      share->read_rate * table->key_info[index].key_length *
+      rows / 2 + 2));
+    DBUG_RETURN(share->read_rate * table->key_info[index].key_length *
+      rows / 2 + 2);
+  } else {
+    DBUG_PRINT("info",("spider read_time = %.6f",
+      share->read_rate * share->stat.mean_rec_length * rows + 2));
+    DBUG_RETURN(share->read_rate * share->stat.mean_rec_length * rows + 2);
+  }
+}
+
+const key_map *ha_spider::keys_to_use_for_scanning()
+{
+  DBUG_ENTER("ha_spider::keys_to_use_for_scanning");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(&key_map_full);
+}
+
+ha_rows ha_spider::estimate_rows_upper_bound()
+{
+  DBUG_ENTER("ha_spider::estimate_rows_upper_bound");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(HA_POS_ERROR);
+}
+
+void ha_spider::print_error(
+  int error,
+  myf errflag
+) {
+  DBUG_ENTER("ha_spider::print_error");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!current_thd->is_error())
+  {
+    switch (error)
+    {
+      case ER_SPIDER_CON_COUNT_ERROR:
+        my_message(error, ER_SPIDER_CON_COUNT_ERROR_STR, MYF(0));
+        break;
+      default:
+        handler::print_error(error, errflag);
+        break;
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+bool ha_spider::get_error_message(
+  int error,
+  String *buf
+) {
+  DBUG_ENTER("ha_spider::get_error_message");
+  DBUG_PRINT("info",("spider this=%p", this));
+  switch (error)
+  {
+    case ER_SPIDER_REMOTE_SERVER_GONE_AWAY_NUM:
+      if (buf->reserve(ER_SPIDER_REMOTE_SERVER_GONE_AWAY_LEN))
+        DBUG_RETURN(TRUE);
+      buf->q_append(ER_SPIDER_REMOTE_SERVER_GONE_AWAY_STR,
+        ER_SPIDER_REMOTE_SERVER_GONE_AWAY_LEN);
+      break;
+    default:
+      if (buf->reserve(ER_SPIDER_UNKNOWN_LEN))
+        DBUG_RETURN(TRUE);
+      buf->q_append(ER_SPIDER_UNKNOWN_STR, ER_SPIDER_UNKNOWN_LEN);
+      break;
+  }
+  DBUG_RETURN(FALSE);
+}
+
+int ha_spider::create(
+  const char *name,
+  TABLE *form,
+  HA_CREATE_INFO *info
+) {
+  int error_num, dummy;
+  SPIDER_SHARE tmp_share;
+  THD *thd = ha_thd();
+  uint sql_command = thd_sql_command(thd), roop_count;
+  SPIDER_TRX *trx;
+  TABLE *table_tables = NULL;
+  SPIDER_Open_tables_backup open_tables_backup;
+  bool need_lock = FALSE;
+  DBUG_ENTER("ha_spider::create");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider name=%s", name));
+  DBUG_PRINT("info",
+    ("spider form->s->connect_string=%s", form->s->connect_string.str));
+  DBUG_PRINT("info",
+    ("spider info->connect_string=%s", info->connect_string.str));
+  if (
+    sql_command == SQLCOM_CREATE_INDEX ||
+    sql_command == SQLCOM_DROP_INDEX
+  )
+    DBUG_RETURN(0);
+  if (!is_supported_parser_charset(info->default_table_charset))
+  {
+    String charset_option;
+    charset_option.append(STRING_WITH_LEN("CHARSET "));
+    charset_option.append(info->default_table_charset->cs_name);
+    my_error(ER_ILLEGAL_HA_CREATE_OPTION, MYF(0), "SPIDER",
+             charset_option.c_ptr());
+    error_num= ER_ILLEGAL_HA_CREATE_OPTION;
+    goto error_charset;
+  }
+  if (!(trx = spider_get_trx(thd, TRUE, &error_num)))
+    goto error_get_trx;
+  if (
+    trx->locked_connections &&
+    sql_command == SQLCOM_ALTER_TABLE
+  ) {
+    my_message(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM,
+      ER_SPIDER_ALTER_BEFORE_UNLOCK_STR, MYF(0));
+    error_num = ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM;
+    goto error_alter_before_unlock;
+  }
+  memset((void*)&tmp_share, 0, sizeof(SPIDER_SHARE));
+  tmp_share.table_name = (char*) name;
+  tmp_share.table_name_length = strlen(name);
+  tmp_share.table_name_hash_value = my_calc_hash(&trx->trx_alter_table_hash,
+    (uchar*) tmp_share.table_name, tmp_share.table_name_length);
+  tmp_share.lgtm_tblhnd_share = spider_get_lgtm_tblhnd_share(
+    name, tmp_share.table_name_length, tmp_share.table_name_hash_value,
+    FALSE, TRUE, &error_num);
+  if (!tmp_share.lgtm_tblhnd_share)
+  {
+    goto error;
+  }
+  if (form->s->keys > 0)
+  {
+    if (!(tmp_share.static_key_cardinality = (longlong *)
+      spider_bulk_malloc(spider_current_trx, 246, MYF(MY_WME),
+        &tmp_share.static_key_cardinality,
+          (uint) (sizeof(*tmp_share.static_key_cardinality) * form->s->keys),
+        NullS))
+    ) {
+      error_num = HA_ERR_OUT_OF_MEM;
+      goto error;
+    }
+    if (!(tmp_share.key_hint = new spider_string[form->s->keys]))
+    {
+      error_num = HA_ERR_OUT_OF_MEM;
+      goto error;
+    }
+  }
+  for (roop_count = 0; roop_count < form->s->keys; roop_count++)
+    tmp_share.key_hint[roop_count].init_calc_mem(85);
+  DBUG_PRINT("info",("spider tmp_share.key_hint=%p", tmp_share.key_hint));
+  if ((error_num = spider_parse_connect_info(&tmp_share, form->s,
+    form->part_info,
+    1)))
+    goto error;
+  DBUG_PRINT("info",("spider tmp_table=%d", form->s->tmp_table));
+  if (
+    (sql_command == SQLCOM_CREATE_TABLE &&
+      !(info->options & HA_LEX_CREATE_TMP_TABLE))
+  ) {
+    if (
+      !(table_tables = spider_open_sys_table(
+        current_thd, SPIDER_SYS_TABLES_TABLE_NAME_STR,
+        SPIDER_SYS_TABLES_TABLE_NAME_LEN, TRUE, &open_tables_backup, FALSE,
+        &error_num))
+    ) {
+      goto error;
+    }
+    if (
+      thd->lex->create_info.or_replace() &&
+      (error_num = spider_delete_tables(
+        table_tables, tmp_share.table_name, &dummy))
+    ) {
+      goto error;
+    }
+    if (
+      (error_num = spider_insert_tables(table_tables, &tmp_share))
+    ) {
+      goto error;
+    }
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, FALSE);
+    table_tables = NULL;
+  } else if (
+    sql_command == SQLCOM_ALTER_TABLE
+  ) {
+    SPIDER_ALTER_TABLE *alter_table;
+    if (trx->query_id != thd->query_id)
+    {
+      spider_free_trx_alter_table(trx);
+      trx->query_id = thd->query_id;
+    }
+    if (!(alter_table =
+      (SPIDER_ALTER_TABLE*) my_hash_search_using_hash_value(
+      &trx->trx_alter_table_hash, tmp_share.table_name_hash_value,
+      (uchar*) tmp_share.table_name, tmp_share.table_name_length)))
+    {
+      if ((error_num = spider_create_trx_alter_table(trx, &tmp_share, TRUE)))
+        goto error;
+    }
+    trx->tmp_flg = TRUE;
+
+    DBUG_PRINT("info",
+      ("spider alter_info.flags: %llu  alter_info.partition_flags: %lu",
+        thd->lex->alter_info.flags, thd->lex->alter_info.partition_flags));
+    if ((thd->lex->alter_info.partition_flags &
+        (
+          SPIDER_ALTER_PARTITION_ADD | SPIDER_ALTER_PARTITION_DROP |
+          SPIDER_ALTER_PARTITION_COALESCE | SPIDER_ALTER_PARTITION_REORGANIZE |
+          SPIDER_ALTER_PARTITION_TABLE_REORG | SPIDER_ALTER_PARTITION_REBUILD
+        )
+      ) &&
+      memcmp(name + strlen(name) - 5, "#TMP#", 5)
+    ) {
+      need_lock = TRUE;
+      if (
+        !(table_tables = spider_open_sys_table(
+          current_thd, SPIDER_SYS_TABLES_TABLE_NAME_STR,
+          SPIDER_SYS_TABLES_TABLE_NAME_LEN, TRUE, &open_tables_backup, TRUE,
+          &error_num))
+      ) {
+        goto error;
+      }
+      if (
+        (error_num = spider_insert_tables(table_tables, &tmp_share))
+      ) {
+        goto error;
+      }
+      spider_close_sys_table(current_thd, table_tables,
+        &open_tables_backup, TRUE);
+      table_tables = NULL;
+    }
+  }
+
+  if (
+    (
+      (info->used_fields & HA_CREATE_USED_AUTO) ||
+      sql_command == SQLCOM_ALTER_TABLE ||
+      sql_command == SQLCOM_CREATE_INDEX ||
+      sql_command == SQLCOM_RENAME_TABLE
+    ) &&
+    info->auto_increment_value > 0
+  ) {
+    pthread_mutex_lock(&tmp_share.lgtm_tblhnd_share->auto_increment_mutex);
+    tmp_share.lgtm_tblhnd_share->auto_increment_value =
+      info->auto_increment_value;
+    DBUG_PRINT("info",("spider auto_increment_value=%llu",
+      tmp_share.lgtm_tblhnd_share->auto_increment_value));
+    pthread_mutex_unlock(&tmp_share.lgtm_tblhnd_share->auto_increment_mutex);
+  }
+
+  if (tmp_share.static_key_cardinality)
+    spider_free(spider_current_trx, tmp_share.static_key_cardinality, MYF(0));
+  spider_free_share_alloc(&tmp_share);
+  DBUG_RETURN(0);
+
+error:
+  if (table_tables)
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, need_lock);
+  if (tmp_share.lgtm_tblhnd_share)
+    spider_free_lgtm_tblhnd_share_alloc(tmp_share.lgtm_tblhnd_share, FALSE);
+  if (tmp_share.static_key_cardinality)
+    spider_free(spider_current_trx, tmp_share.static_key_cardinality, MYF(0));
+  spider_free_share_alloc(&tmp_share);
+error_alter_before_unlock:
+error_get_trx:
+error_charset:
+  DBUG_RETURN(error_num);
+}
+
+void ha_spider::update_create_info(
+  HA_CREATE_INFO* create_info
+) {
+  DBUG_ENTER("ha_spider::update_create_info");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (wide_handler && wide_handler->sql_command == SQLCOM_ALTER_TABLE)
+  {
+    SPIDER_TRX *trx = wide_handler->trx;
+    THD *thd = trx->thd;
+    if (trx->query_id != thd->query_id)
+    {
+      spider_free_trx_alter_table(trx);
+      trx->query_id = thd->query_id;
+      trx->tmp_flg = FALSE;
+    }
+    if (!(SPIDER_ALTER_TABLE*) my_hash_search(&trx->trx_alter_table_hash,
+      (uchar*) share->table_name, share->table_name_length))
+    {
+      if (spider_create_trx_alter_table(trx, share, FALSE))
+      {
+        store_error_num = HA_ERR_OUT_OF_MEM;
+        DBUG_VOID_RETURN;
+      }
+    }
+  }
+
+  if (!create_info->connect_string.str)
+  {
+    create_info->connect_string.str = table->s->connect_string.str;
+    create_info->connect_string.length = table->s->connect_string.length;
+  }
+  DBUG_PRINT("info",
+    ("spider create_info->connect_string=%s",
+    create_info->connect_string.str));
+  if (
+    !(create_info->used_fields & HA_CREATE_USED_AUTO)
+  ) {
+    info(HA_STATUS_AUTO);
+    create_info->auto_increment_value = stats.auto_increment_value;
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::rename_table(
+  const char *from,
+  const char *to
+) {
+  int error_num, roop_count, old_link_count, from_len = strlen(from),
+    to_len = strlen(to), tmp_error_num;
+  my_hash_value_type from_hash_value = my_calc_hash(&spider_open_tables,
+    (uchar*) from, from_len);
+  my_hash_value_type to_hash_value = my_calc_hash(&spider_open_tables,
+    (uchar*) to, to_len);
+  THD *thd = ha_thd();
+  uint sql_command = thd_sql_command(thd);
+  SPIDER_TRX *trx;
+  TABLE *table_tables = NULL;
+  SPIDER_ALTER_TABLE *alter_table_from, *alter_table_to;
+  SPIDER_LGTM_TBLHND_SHARE *from_lgtm_tblhnd_share, *to_lgtm_tblhnd_share;
+  SPIDER_Open_tables_backup open_tables_backup;
+  bool need_lock = FALSE;
+  DBUG_ENTER("ha_spider::rename_table");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider from=%s", from));
+  DBUG_PRINT("info",("spider to=%s", to));
+  if (
+    sql_command == SQLCOM_CREATE_INDEX ||
+    sql_command == SQLCOM_DROP_INDEX
+  )
+    DBUG_RETURN(0);
+  if (!(trx = spider_get_trx(thd, TRUE, &error_num)))
+    goto error;
+  if (
+    trx->locked_connections &&
+    /* SQLCOM_RENAME_TABLE doesn't come here */
+    sql_command == SQLCOM_ALTER_TABLE
+  ) {
+    my_message(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM,
+      ER_SPIDER_ALTER_BEFORE_UNLOCK_STR, MYF(0));
+    error_num = ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM;
+    goto error;
+  }
+  if (
+    sql_command == SQLCOM_RENAME_TABLE ||
+    (sql_command == SQLCOM_ALTER_TABLE && !trx->tmp_flg) ||
+    !(alter_table_from =
+      (SPIDER_ALTER_TABLE*) my_hash_search(&trx->trx_alter_table_hash,
+      (uchar*) from, from_len))
+  ) {
+    if (
+      !(table_tables = spider_open_sys_table(
+        current_thd, SPIDER_SYS_TABLES_TABLE_NAME_STR,
+        SPIDER_SYS_TABLES_TABLE_NAME_LEN, TRUE, &open_tables_backup, FALSE,
+        &error_num))
+    ) {
+      goto error;
+    }
+    if (
+      (error_num = spider_update_tables_name(
+        table_tables, from, to, &old_link_count))
+    ) {
+      goto error;
+    }
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, FALSE);
+    table_tables = NULL;
+
+    /* release table mon list */
+    for (roop_count = 0; roop_count < old_link_count; roop_count++)
+    {
+      if ((error_num =
+        spider_release_ping_table_mon_list(from, from_len, roop_count)))
+      {
+        goto error;
+      }
+    }
+  } else if (sql_command == SQLCOM_ALTER_TABLE)
+  {
+    DBUG_PRINT("info",("spider alter_table_from=%p", alter_table_from));
+    if ((alter_table_to =
+      (SPIDER_ALTER_TABLE*) my_hash_search(&trx->trx_alter_table_hash,
+      (uchar*) to, to_len))
+    ) {
+      DBUG_PRINT("info",("spider copy link_statuses"));
+      uint all_link_count = alter_table_from->all_link_count;
+      if (all_link_count > alter_table_to->all_link_count)
+        all_link_count = alter_table_to->all_link_count;
+      for (roop_count = 0; roop_count < (int) all_link_count; roop_count++)
+      {
+        if (alter_table_from->tmp_link_statuses[roop_count] <=
+          SPIDER_LINK_STATUS_NO_CHANGE)
+        {
+          DBUG_PRINT("info",("spider copy %d", roop_count));
+          alter_table_from->tmp_link_statuses[roop_count] =
+            alter_table_to->tmp_link_statuses[roop_count];
+        }
+        DBUG_PRINT("info",("spider link_status_from[%d]=%ld", roop_count,
+          alter_table_from->tmp_link_statuses[roop_count]));
+        DBUG_PRINT("info",("spider link_status_to[%d]=%ld", roop_count,
+          alter_table_to->tmp_link_statuses[roop_count]));
+      }
+    }
+
+    DBUG_PRINT("info",
+      ("spider alter_info.flags: %llu  alter_info.partition_flags: %lu",
+        thd->lex->alter_info.flags, thd->lex->alter_info.partition_flags));
+    if (
+      (thd->lex->alter_info.partition_flags &
+        (
+          SPIDER_ALTER_PARTITION_ADD | SPIDER_ALTER_PARTITION_DROP |
+          SPIDER_ALTER_PARTITION_COALESCE | SPIDER_ALTER_PARTITION_REORGANIZE |
+          SPIDER_ALTER_PARTITION_TABLE_REORG | SPIDER_ALTER_PARTITION_REBUILD
+        )
+      )
+    )
+      need_lock = TRUE;
+
+    if (
+      !(table_tables = spider_open_sys_table(
+        current_thd, SPIDER_SYS_TABLES_TABLE_NAME_STR,
+        SPIDER_SYS_TABLES_TABLE_NAME_LEN, TRUE, &open_tables_backup, need_lock,
+        &error_num))
+    ) {
+      goto error;
+    }
+
+    if (alter_table_from->now_create)
+    {
+      SPIDER_SHARE tmp_share;
+      tmp_share.table_name = (char*) to;
+      tmp_share.table_name_length = to_len;
+      tmp_share.priority = alter_table_from->tmp_priority;
+      tmp_share.link_count = alter_table_from->link_count;
+      tmp_share.all_link_count = alter_table_from->all_link_count;
+      memcpy(&tmp_share.alter_table, alter_table_from,
+        sizeof(*alter_table_from));
+      if (
+        (error_num = spider_insert_tables(table_tables, &tmp_share))
+      ) {
+        goto error;
+      }
+    } else {
+      if (
+        (error_num = spider_update_tables_priority(
+          table_tables, alter_table_from, to, &old_link_count))
+      ) {
+        goto error;
+      }
+    }
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, need_lock);
+    table_tables = NULL;
+
+    if (!alter_table_from->now_create)
+    {
+      /* release table mon list */
+      for (roop_count = 0; roop_count < (int) alter_table_from->all_link_count;
+        roop_count++)
+      {
+        if ((error_num =
+          spider_release_ping_table_mon_list(from, from_len, roop_count)))
+        {
+          goto error;
+        }
+      }
+      for (roop_count = 0; roop_count < old_link_count; roop_count++)
+      {
+        if ((error_num =
+          spider_release_ping_table_mon_list(to, to_len, roop_count)))
+        {
+          goto error;
+        }
+      }
+    }
+/*
+    spider_free_trx_alter_table_alloc(trx, alter_table_from);
+*/
+  }
+
+  pthread_mutex_lock(&spider_lgtm_tblhnd_share_mutex);
+  from_lgtm_tblhnd_share = spider_get_lgtm_tblhnd_share(
+    from, from_len, from_hash_value, TRUE, FALSE, &error_num);
+  if (from_lgtm_tblhnd_share)
+  {
+    to_lgtm_tblhnd_share = spider_get_lgtm_tblhnd_share(
+      to, to_len, to_hash_value, TRUE, TRUE, &error_num);
+    if (!to_lgtm_tblhnd_share)
+    {
+      pthread_mutex_unlock(&spider_lgtm_tblhnd_share_mutex);
+      goto error;
+    }
+    DBUG_PRINT("info",
+      ("spider auto_increment_init=%s",
+        from_lgtm_tblhnd_share->auto_increment_init ? "TRUE" : "FALSE"));
+    to_lgtm_tblhnd_share->auto_increment_init =
+      from_lgtm_tblhnd_share->auto_increment_init;
+    to_lgtm_tblhnd_share->auto_increment_lclval =
+      from_lgtm_tblhnd_share->auto_increment_lclval;
+    to_lgtm_tblhnd_share->auto_increment_value =
+      from_lgtm_tblhnd_share->auto_increment_value;
+    spider_free_lgtm_tblhnd_share_alloc(from_lgtm_tblhnd_share, TRUE);
+  }
+  pthread_mutex_unlock(&spider_lgtm_tblhnd_share_mutex);
+  spider_delete_init_error_table(from);
+  DBUG_RETURN(0);
+
+error:
+  if (table_tables)
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, need_lock);
+  pthread_mutex_lock(&spider_lgtm_tblhnd_share_mutex);
+  to_lgtm_tblhnd_share = spider_get_lgtm_tblhnd_share(
+    to, to_len, to_hash_value, TRUE, FALSE, &tmp_error_num);
+  if (to_lgtm_tblhnd_share)
+    spider_free_lgtm_tblhnd_share_alloc(to_lgtm_tblhnd_share, TRUE);
+  pthread_mutex_unlock(&spider_lgtm_tblhnd_share_mutex);
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::delete_table(
+  const char *name
+) {
+  int error_num;
+  THD *thd = ha_thd();
+  SPIDER_TRX *trx;
+  TABLE *table_tables = NULL;
+  uint sql_command = thd_sql_command(thd);
+  SPIDER_ALTER_TABLE *alter_table;
+  SPIDER_Open_tables_backup open_tables_backup;
+  bool need_lock = FALSE;
+  DBUG_ENTER("ha_spider::delete_table");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider name=%s", name));
+  if (
+    sql_command == SQLCOM_CREATE_INDEX ||
+    sql_command == SQLCOM_DROP_INDEX
+  )
+    DBUG_RETURN(0);
+  if (!(trx = spider_get_trx(thd, TRUE, &error_num)))
+    goto error;
+  if (
+    trx->locked_connections &&
+    /* SQLCOM_DROP_DB doesn't come here */
+    (
+      sql_command == SQLCOM_DROP_TABLE ||
+      sql_command == SQLCOM_ALTER_TABLE
+    )
+  ) {
+    my_message(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM,
+      ER_SPIDER_ALTER_BEFORE_UNLOCK_STR, MYF(0));
+    error_num = ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM;
+    goto error;
+  }
+  if (sql_command == SQLCOM_DROP_TABLE ||
+    sql_command == SQLCOM_DROP_DB ||
+    sql_command == SQLCOM_ALTER_TABLE ||
+    sql_command == SQLCOM_CREATE_TABLE)
+  {
+    SPIDER_LGTM_TBLHND_SHARE *lgtm_tblhnd_share;
+    int roop_count, old_link_count = 0, name_len = strlen(name);
+    my_hash_value_type hash_value = my_calc_hash(&spider_open_tables,
+      (uchar*) name, name_len);
+    if (
+      sql_command == SQLCOM_ALTER_TABLE &&
+      (alter_table =
+        (SPIDER_ALTER_TABLE*) my_hash_search_using_hash_value(
+        &trx->trx_alter_table_hash,
+        hash_value, (uchar*) name, name_len)) &&
+      alter_table->now_create
+    )
+      DBUG_RETURN(0);
+
+    DBUG_PRINT("info",
+      ("spider alter_info.flags: %llu  alter_info.partition_flags: %lu",
+        thd->lex->alter_info.flags, thd->lex->alter_info.partition_flags));
+    if (
+      sql_command == SQLCOM_ALTER_TABLE &&
+      (thd->lex->alter_info.partition_flags &
+        (
+          SPIDER_ALTER_PARTITION_ADD | SPIDER_ALTER_PARTITION_DROP |
+          SPIDER_ALTER_PARTITION_COALESCE | SPIDER_ALTER_PARTITION_REORGANIZE |
+          SPIDER_ALTER_PARTITION_TABLE_REORG | SPIDER_ALTER_PARTITION_REBUILD
+        )
+      )
+    )
+      need_lock = TRUE;
+
+    if ((error_num = spider_sys_delete_table_sts(
+      current_thd, name, name_len, need_lock)))
+      goto error;
+    if ((error_num = spider_sys_delete_table_crd(
+      current_thd, name, name_len, need_lock)))
+      goto error;
+    if (
+      !(table_tables = spider_open_sys_table(
+        current_thd, SPIDER_SYS_TABLES_TABLE_NAME_STR,
+        SPIDER_SYS_TABLES_TABLE_NAME_LEN, TRUE, &open_tables_backup, need_lock,
+        &error_num))
+    ) {
+      goto error;
+    }
+    if (
+      (error_num = spider_delete_tables(
+        table_tables, name, &old_link_count))
+    ) {
+      goto error;
+    }
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, need_lock);
+    table_tables = NULL;
+
+    /* release table mon list */
+    for (roop_count = 0; roop_count < old_link_count; roop_count++)
+    {
+      if ((error_num =
+        spider_release_ping_table_mon_list(name, name_len, roop_count)))
+        goto error;
+    }
+
+    pthread_mutex_lock(&spider_lgtm_tblhnd_share_mutex);
+    lgtm_tblhnd_share = spider_get_lgtm_tblhnd_share(
+      name, name_len, hash_value, TRUE, FALSE, &error_num);
+    if (lgtm_tblhnd_share)
+      spider_free_lgtm_tblhnd_share_alloc(lgtm_tblhnd_share, TRUE);
+    pthread_mutex_unlock(&spider_lgtm_tblhnd_share_mutex);
+  }
+
+  spider_delete_init_error_table(name);
+  DBUG_RETURN(0);
+
+error:
+  if (table_tables)
+    spider_close_sys_table(current_thd, table_tables,
+      &open_tables_backup, need_lock);
+  DBUG_RETURN(error_num);
+}
+
+bool ha_spider::is_crashed() const
+{
+  DBUG_ENTER("ha_spider::is_crashed");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(FALSE);
+}
+
+#ifdef SPIDER_HANDLER_AUTO_REPAIR_HAS_ERROR
+bool ha_spider::auto_repair(int error) const
+#else
+bool ha_spider::auto_repair() const
+#endif
+{
+  DBUG_ENTER("ha_spider::auto_repair");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_RETURN(FALSE);
+}
+
+int ha_spider::disable_indexes(
+  uint mode
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::disable_indexes");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = spider_db_disable_keys(this)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::enable_indexes(
+  uint mode
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::enable_indexes");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = spider_db_enable_keys(this)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+
+int ha_spider::check(
+  THD* thd,
+  HA_CHECK_OPT* check_opt
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::check");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = spider_db_check_table(this, check_opt)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::repair(
+  THD* thd,
+  HA_CHECK_OPT* check_opt
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::repair");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = spider_db_repair_table(this, check_opt)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+bool ha_spider::check_and_repair(
+  THD *thd
+) {
+  HA_CHECK_OPT check_opt;
+  DBUG_ENTER("ha_spider::check_and_repair");
+  DBUG_PRINT("info",("spider this=%p", this));
+  check_opt.init();
+  check_opt.flags = T_MEDIUM;
+  if (spider_db_check_table(this, &check_opt))
+  {
+    check_opt.flags = T_QUICK;
+    if (spider_db_repair_table(this, &check_opt))
+      DBUG_RETURN(TRUE);
+  }
+  DBUG_RETURN(FALSE);
+}
+
+int ha_spider::analyze(
+  THD* thd,
+  HA_CHECK_OPT* check_opt
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::analyze");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = spider_db_analyze_table(this)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+int ha_spider::optimize(
+  THD* thd,
+  HA_CHECK_OPT* check_opt
+) {
+  int error_num;
+  backup_error_status();
+  DBUG_ENTER("ha_spider::optimize");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if ((error_num = spider_db_optimize_table(this)))
+    DBUG_RETURN(check_error_mode(error_num));
+  DBUG_RETURN(0);
+}
+
+bool ha_spider::is_fatal_error(
+  int error_num,
+  uint flags
+) {
+  DBUG_ENTER("ha_spider::is_fatal_error");
+  DBUG_PRINT("info",("spider error_num=%d", error_num));
+  DBUG_PRINT("info",("spider flags=%u", flags));
+  if (
+    !handler::is_fatal_error(error_num, flags)
+  ) {
+    DBUG_PRINT("info",("spider FALSE"));
+    DBUG_RETURN(FALSE);
+  }
+  DBUG_PRINT("info",("spider TRUE"));
+  DBUG_RETURN(TRUE);
+}
+
+Field *ha_spider::field_exchange(
+  Field *field
+) {
+  DBUG_ENTER("ha_spider::field_exchange");
+  DBUG_PRINT("info",("spider in field=%p", field));
+  DBUG_PRINT("info",("spider in field->table=%p", field->table));
+  DBUG_PRINT("info",("spider table=%p", table));
+  if (field->table != table)
+    DBUG_RETURN(NULL);
+  DBUG_PRINT("info",("spider out field=%p", field));
+  DBUG_RETURN(field);
+}
+
+const COND *ha_spider::cond_push(
+  const COND *cond
+) {
+  DBUG_ENTER("ha_spider::cond_push");
+  if (
+    wide_handler->stage == SPD_HND_STAGE_COND_PUSH &&
+    wide_handler->stage_executor != this)
+  {
+    DBUG_RETURN(NULL);
+  }
+  wide_handler->stage = SPD_HND_STAGE_COND_PUSH;
+  wide_handler->stage_executor = this;
+  wide_handler->cond_check = FALSE;
+  if (cond)
+  {
+    SPIDER_CONDITION *tmp_cond;
+    if (!(tmp_cond = (SPIDER_CONDITION *)
+      spider_malloc(spider_current_trx, 3, sizeof(*tmp_cond), MYF(MY_WME)))
+    )
+      DBUG_RETURN(cond);
+    tmp_cond->cond = (COND *) cond;
+    tmp_cond->next = wide_handler->condition;
+    wide_handler->condition = tmp_cond;
+  }
+  DBUG_RETURN(NULL);
+}
+
+void ha_spider::cond_pop()
+{
+  DBUG_ENTER("ha_spider::cond_pop");
+  if (
+    wide_handler->stage == SPD_HND_STAGE_COND_POP &&
+    wide_handler->stage_executor != this)
+  {
+    DBUG_VOID_RETURN;
+  }
+  wide_handler->stage = SPD_HND_STAGE_COND_POP;
+  wide_handler->stage_executor = this;
+  if (wide_handler->condition)
+  {
+    SPIDER_CONDITION *tmp_cond = wide_handler->condition->next;
+    spider_free(spider_current_trx, wide_handler->condition, MYF(0));
+    wide_handler->condition = tmp_cond;
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::info_push(
+  uint info_type,
+  void *info
+) {
+  int error_num = 0;
+  DBUG_ENTER("ha_spider::info_push");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (
+    wide_handler->stage == SPD_HND_STAGE_INFO_PUSH &&
+    wide_handler->stage_executor != this)
+  {
+    DBUG_RETURN(0);
+  }
+  wide_handler->stage = SPD_HND_STAGE_INFO_PUSH;
+  wide_handler->stage_executor = this;
+
+  switch (info_type)
+  {
+#ifdef INFO_KIND_UPDATE_FIELDS
+    case INFO_KIND_UPDATE_FIELDS:
+      DBUG_PRINT("info",("spider INFO_KIND_UPDATE_FIELDS"));
+      wide_handler->direct_update_fields = (List<Item> *) info;
+      wide_handler->update_request = TRUE;
+      if (wide_handler->keyread && check_partitioned())
+        wide_handler->keyread = FALSE;
+      break;
+#endif
+#ifdef INFO_KIND_UPDATE_VALUES
+    case INFO_KIND_UPDATE_VALUES:
+      DBUG_PRINT("info",("spider INFO_KIND_UPDATE_VALUES"));
+      wide_handler->direct_update_values = (List<Item> *) info;
+      break;
+#endif
+#ifdef INFO_KIND_FORCE_LIMIT_BEGIN
+    case INFO_KIND_FORCE_LIMIT_BEGIN:
+      DBUG_PRINT("info",("spider INFO_KIND_FORCE_LIMIT_BEGIN"));
+      wide_handler->info_limit = *((longlong *) info);
+      break;
+    case INFO_KIND_FORCE_LIMIT_END:
+      DBUG_PRINT("info",("spider INFO_KIND_FORCE_LIMIT_END"));
+      wide_handler->info_limit = 9223372036854775807LL;
+      break;
+#endif
+    default:
+      break;
+  }
+  DBUG_RETURN(error_num);
+}
+
+void ha_spider::return_record_by_parent()
+{
+  DBUG_ENTER("ha_spider::return_record_by_parent");
+  DBUG_PRINT("info",("spider this=%p", this));
+  spider_db_refetch_for_item_sum_funcs(this);
+  DBUG_VOID_RETURN;
+}
+
+TABLE *ha_spider::get_table()
+{
+  DBUG_ENTER("ha_spider::get_table");
+  DBUG_RETURN(table);
+}
+
+void ha_spider::set_ft_discard_bitmap()
+{
+  DBUG_ENTER("ha_spider::set_ft_discard_bitmap");
+  TABLE_LIST *table_list = spider_get_parent_table_list(this);
+  if (table_list)
+  {
+    st_select_lex *select_lex = table_list->select_lex;
+    if (select_lex && select_lex->ftfunc_list)
+    {
+      uint roop_count;
+      Field *field;
+      Item *item, *item_next;
+      Item_func_match *item_func_match;
+      Item_field *item_field;
+      {
+        List_iterator_fast<Item_func_match> fmi(*select_lex->ftfunc_list);
+        while ((item_func_match = fmi++))
+        {
+          DBUG_PRINT("info",("spider item_func_match=%p", item_func_match));
+          uint item_count = item_func_match->argument_count();
+          Item **item_list = item_func_match->arguments();
+          for (roop_count = 1; roop_count < item_count; roop_count++)
+          {
+            item_field = (Item_field *) item_list[roop_count];
+            DBUG_PRINT("info",("spider item_field=%p", item_field));
+            field = item_field->field;
+            DBUG_PRINT("info",("spider field=%p", field));
+            if (!field || !(field = field_exchange(field)))
+              continue;
+            DBUG_PRINT("info",("spider clear_bit=%u", field->field_index));
+            spider_clear_bit(wide_handler->ft_discard_bitmap,
+              field->field_index);
+          }
+        }
+      }
+      THD *thd = ha_thd();
+      Statement *stmt = thd->stmt_map.find(thd->id);
+      if (stmt && stmt->free_list)
+      {
+        DBUG_PRINT("info",("spider item from stmt"));
+        item_next = stmt->free_list;
+      } else {
+        DBUG_PRINT("info",("spider item from thd"));
+        item_next = thd->free_list;
+      }
+      while ((item = item_next))
+      {
+        DBUG_PRINT("info",("spider item=%p", item));
+        DBUG_PRINT("info",("spider itemtype=%u", item->type()));
+        item_next = item->next;
+        if (item->type() != Item::FIELD_ITEM)
+          continue;
+        field = ((Item_field *) item)->field;
+        DBUG_PRINT("info",("spider field=%p", field));
+        if (!field || !(field = field_exchange(field)))
+          continue;
+        DBUG_PRINT("info",("spider field_index=%u", field->field_index));
+        if (!spider_bit_is_set(wide_handler->ft_discard_bitmap,
+          field->field_index))
+        {
+          bool match_flag = FALSE;
+          List_iterator_fast<Item_func_match> fmi(*select_lex->ftfunc_list);
+          while ((item_func_match = fmi++))
+          {
+            DBUG_PRINT("info",("spider item_func_match=%p", item_func_match));
+            uint item_count = item_func_match->argument_count();
+            Item **item_list = item_func_match->arguments();
+            for (roop_count = 1; roop_count < item_count; roop_count++)
+            {
+              DBUG_PRINT("info",("spider item_list[%u]=%p", roop_count,
+                item_list[roop_count]));
+              if (item == item_list[roop_count])
+              {
+                DBUG_PRINT("info",("spider matched"));
+                match_flag = TRUE;
+                break;
+              }
+            }
+            if (match_flag)
+              break;
+          }
+          if (!match_flag)
+          {
+            DBUG_PRINT("info",("spider set_bit=%u", field->field_index));
+            spider_set_bit(wide_handler->ft_discard_bitmap,
+              field->field_index);
+          }
+        }
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_searched_bitmap()
+{
+  int roop_count;
+  DBUG_ENTER("ha_spider::set_searched_bitmap");
+  for (roop_count = 0; roop_count < (int) ((table_share->fields + 7) / 8);
+    roop_count++)
+  {
+    wide_handler->searched_bitmap[roop_count] =
+      ((uchar *) table->read_set->bitmap)[roop_count] |
+      ((uchar *) table->write_set->bitmap)[roop_count];
+    DBUG_PRINT("info",("spider roop_count=%d", roop_count));
+    DBUG_PRINT("info",("spider searched_bitmap=%d",
+      wide_handler->searched_bitmap[roop_count]));
+    DBUG_PRINT("info",("spider read_set=%d",
+      ((uchar *) table->read_set->bitmap)[roop_count]));
+    DBUG_PRINT("info",("spider write_set=%d",
+      ((uchar *) table->write_set->bitmap)[roop_count]));
+  }
+  if (wide_handler->sql_command == SQLCOM_UPDATE ||
+    wide_handler->sql_command == SQLCOM_UPDATE_MULTI)
+  {
+    DBUG_PRINT("info",("spider update option start"));
+    Item *item;
+    st_select_lex *select_lex = spider_get_select_lex(this);
+    List_iterator_fast<Item> fi(select_lex->item_list);
+    while ((item = fi++))
+    {
+      if (item->type() == Item::FIELD_ITEM)
+      {
+        Field *field = ((Item_field *)item)->field;
+        if (!(field = field_exchange(field)))
+        {
+          DBUG_PRINT("info",("spider field is for different table"));
+          continue;
+        }
+        spider_set_bit(wide_handler->searched_bitmap, field->field_index);
+        DBUG_PRINT("info",("spider set searched_bitmap=%u",
+          field->field_index));
+      } else {
+        DBUG_PRINT("info",("spider item type is not field"));
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_clone_searched_bitmap()
+{
+  DBUG_ENTER("ha_spider::set_clone_searched_bitmap");
+  DBUG_PRINT("info",("spider searched_bitmap=%p",
+    wide_handler->searched_bitmap));
+#ifndef DBUG_OFF
+  int roop_count;
+  for (roop_count = 0; roop_count < (int) ((table_share->fields + 7) / 8);
+    roop_count++)
+    DBUG_PRINT("info", ("spider before searched_bitmap is %x",
+      ((uchar *) wide_handler->searched_bitmap)[roop_count]));
+#endif
+  memcpy(wide_handler->searched_bitmap,
+    pt_clone_source_handler->wide_handler->searched_bitmap,
+    (table_share->fields + 7) / 8);
+#ifndef DBUG_OFF
+  for (roop_count = 0; roop_count < (int) ((table_share->fields + 7) / 8);
+    roop_count++)
+    DBUG_PRINT("info", ("spider after searched_bitmap is %x",
+      ((uchar *) wide_handler->searched_bitmap)[roop_count]));
+#endif
+  memcpy(wide_handler->ft_discard_bitmap,
+    pt_clone_source_handler->wide_handler->ft_discard_bitmap,
+    (table_share->fields + 7) / 8);
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_searched_bitmap_from_item_list()
+{
+  DBUG_ENTER("ha_spider::set_searched_bitmap_from_item_list");
+  Field *field;
+  Item *item, *item_next;
+  THD *thd = ha_thd();
+  Statement *stmt = thd->stmt_map.find(thd->id);
+  if (stmt && stmt->free_list)
+  {
+    DBUG_PRINT("info",("spider item from stmt"));
+    item_next = stmt->free_list;
+  } else {
+    DBUG_PRINT("info",("spider item from thd"));
+    item_next = thd->free_list;
+  }
+  while ((item = item_next))
+  {
+    DBUG_PRINT("info",("spider item=%p", item));
+    DBUG_PRINT("info",("spider itemtype=%u", item->type()));
+    item_next = item->next;
+    if (item->type() != Item::FIELD_ITEM)
+      continue;
+    field = ((Item_field *) item)->field;
+    DBUG_PRINT("info",("spider field=%p", field));
+    if (!field || !(field = field_exchange(field)))
+      continue;
+    DBUG_PRINT("info",("spider field_index=%u", field->field_index));
+    spider_set_bit(wide_handler->searched_bitmap, field->field_index);
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_select_column_mode()
+{
+  int roop_count;
+  KEY *key_info;
+  KEY_PART_INFO *key_part;
+  Field *field;
+  THD *thd = wide_handler->trx->thd;
+  DBUG_ENTER("ha_spider::set_select_column_mode");
+  wide_handler->position_bitmap_init = FALSE;
+#ifndef DBUG_OFF
+  for (roop_count = 0; roop_count < (int) ((table_share->fields + 7) / 8);
+    roop_count++)
+    DBUG_PRINT("info", ("spider bitmap is %x",
+      ((uchar *) table->read_set->bitmap)[roop_count]));
+#endif
+  select_column_mode = spider_param_select_column_mode(thd,
+    share->select_column_mode);
+  if (select_column_mode)
+  {
+    DBUG_PRINT("info",("spider searched_bitmap=%p",
+      wide_handler->searched_bitmap));
+    set_searched_bitmap();
+    set_searched_bitmap_from_item_list();
+    if (wide_handler->external_lock_type == F_WRLCK &&
+      wide_handler->sql_command != SQLCOM_SELECT)
+    {
+      uint part_num = 0;
+      if (wide_handler->update_request)
+        part_num = check_partitioned();
+      if (
+        part_num ||
+        table_share->primary_key == MAX_KEY
+      ) {
+        /* need all columns */
+        for (roop_count = 0; roop_count < (int) table_share->fields;
+          roop_count++)
+          spider_set_bit(wide_handler->searched_bitmap, roop_count);
+      } else {
+        /* need primary key columns */
+        key_info = &table_share->key_info[table_share->primary_key];
+        key_part = key_info->key_part;
+        for (roop_count = 0;
+          roop_count < (int) spider_user_defined_key_parts(key_info);
+          roop_count++)
+        {
+          field = key_part[roop_count].field;
+          spider_set_bit(wide_handler->searched_bitmap, field->field_index);
+        }
+      }
+#ifndef DBUG_OFF
+      for (roop_count = 0;
+        roop_count < (int) ((table_share->fields + 7) / 8);
+        roop_count++)
+        DBUG_PRINT("info", ("spider change bitmap is %x",
+          wide_handler->searched_bitmap[roop_count]));
+#endif
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::check_select_column(bool rnd)
+{
+  THD *thd = wide_handler->trx->thd;
+  DBUG_ENTER("ha_spider::check_select_column");
+  select_column_mode = spider_param_select_column_mode(thd,
+    share->select_column_mode);
+  if (select_column_mode)
+  {
+    if (!rnd)
+    {
+      if (wide_handler->between_flg)
+      {
+        memcpy(wide_handler->idx_read_bitmap,
+          table->read_set->bitmap, (table_share->fields + 7) / 8);
+        memcpy(wide_handler->idx_write_bitmap,
+          table->write_set->bitmap, (table_share->fields + 7) / 8);
+        wide_handler->between_flg = FALSE;
+        wide_handler->idx_bitmap_is_set = TRUE;
+        DBUG_PRINT("info",("spider set idx_bitmap"));
+      } else if (wide_handler->idx_bitmap_is_set)
+      {
+        memcpy(table->read_set->bitmap,
+          wide_handler->idx_read_bitmap,
+          (table_share->fields + 7) / 8);
+        memcpy(table->write_set->bitmap,
+          wide_handler->idx_write_bitmap,
+          (table_share->fields + 7) / 8);
+        DBUG_PRINT("info",("spider copy idx_bitmap"));
+      }
+    } else {
+      if (
+        !wide_handler->rnd_bitmap_is_set &&
+        (
+          wide_handler->between_flg ||
+          wide_handler->idx_bitmap_is_set
+        )
+      ) {
+        memcpy(wide_handler->rnd_read_bitmap,
+          table->read_set->bitmap, (table_share->fields + 7) / 8);
+        memcpy(wide_handler->rnd_write_bitmap,
+          table->write_set->bitmap, (table_share->fields + 7) / 8);
+        wide_handler->between_flg = FALSE;
+        wide_handler->rnd_bitmap_is_set = TRUE;
+        DBUG_PRINT("info",("spider set rnd_bitmap"));
+      } else if (wide_handler->rnd_bitmap_is_set)
+      {
+        memcpy(table->read_set->bitmap,
+          wide_handler->rnd_read_bitmap,
+          (table_share->fields + 7) / 8);
+        memcpy(table->write_set->bitmap,
+          wide_handler->rnd_write_bitmap,
+          (table_share->fields + 7) / 8);
+        DBUG_PRINT("info",("spider copy rnd_bitmap"));
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+bool ha_spider::check_and_start_bulk_update(
+  spider_bulk_upd_start bulk_upd_start
+) {
+  DBUG_ENTER("ha_spider::check_and_start_bulk_update");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider bulk_update_start=%d",
+    result_list.bulk_update_start));
+  if (
+    result_list.bulk_update_start == SPD_BU_NOT_START ||
+    (
+      !result_list.bulk_update_mode &&
+      bulk_upd_start == SPD_BU_START_BY_BULK_INIT
+    )
+  ) {
+    THD *thd = ha_thd();
+    int bulk_update_mode = spider_param_bulk_update_mode(thd,
+      share->bulk_update_mode);
+/*
+    longlong split_read = spider_split_read_param(this);
+*/
+    result_list.bulk_update_size = spider_param_bulk_update_size(thd,
+      share->bulk_update_size);
+
+    if (!support_bulk_update_sql())
+    {
+      result_list.bulk_update_mode = 0;
+      DBUG_PRINT("info",("spider result_list.bulk_update_mode=%d 1",
+        result_list.bulk_update_mode));
+/*
+    } else if (
+      split_read != 9223372036854775807LL
+    ) {
+      result_list.bulk_update_mode = 2;
+      DBUG_PRINT("info",("spider result_list.bulk_update_mode=%d 2",
+        result_list.bulk_update_mode));
+*/
+    } else {
+      if (result_list.bulk_update_start == SPD_BU_NOT_START)
+      {
+        result_list.bulk_update_mode = bulk_update_mode;
+        DBUG_PRINT("info",("spider result_list.bulk_update_mode=%d 3",
+          result_list.bulk_update_mode));
+      } else {
+        result_list.bulk_update_mode = 1;
+        DBUG_PRINT("info",("spider result_list.bulk_update_mode=%d 4",
+          result_list.bulk_update_mode));
+      }
+    }
+    result_list.bulk_update_start = bulk_upd_start;
+    DBUG_RETURN(FALSE);
+  }
+  DBUG_RETURN(TRUE);
+}
+
+int ha_spider::check_and_end_bulk_update(
+  spider_bulk_upd_start bulk_upd_start
+) {
+  int error_num = 0;
+  ha_rows dup_key_found = 0;
+  DBUG_ENTER("ha_spider::check_and_end_bulk_update");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider bulk_update_start=%d",
+    result_list.bulk_update_start));
+  DBUG_PRINT("info",("spider bulk_update_mode=%d",
+    result_list.bulk_update_mode));
+  if (result_list.bulk_update_start == bulk_upd_start)
+  {
+    if (result_list.bulk_update_mode)
+      error_num = spider_db_bulk_update_end(this, &dup_key_found);
+    result_list.bulk_update_size = 0;
+    result_list.bulk_update_mode = 0;
+    result_list.bulk_update_start = SPD_BU_NOT_START;
+  }
+  DBUG_RETURN(error_num);
+}
+
+uint ha_spider::check_partitioned()
+{
+  uint part_num;
+  DBUG_ENTER("ha_spider::check_partitioned");
+  DBUG_PRINT("info",("spider this=%p", this));
+  table->file->get_no_parts("", &part_num);
+  if (part_num)
+    DBUG_RETURN(part_num);
+
+  TABLE_LIST *tmp_table_list = table->pos_in_table_list;
+  while ((tmp_table_list = tmp_table_list->parent_l))
+  {
+    tmp_table_list->table->file->get_no_parts("", &part_num);
+    if (part_num)
+      DBUG_RETURN(part_num);
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::check_direct_order_limit()
+{
+  DBUG_ENTER("ha_spider::check_direct_order_limit");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!result_list.check_direct_order_limit)
+  {
+    if (spider_check_direct_order_limit(this))
+    {
+      result_list.direct_order_limit = TRUE;
+    } else
+      result_list.direct_order_limit = FALSE;
+
+    spider_set_direct_limit_offset(this);
+    result_list.check_direct_order_limit = TRUE;
+  }
+  DBUG_VOID_RETURN;
+}
+
+/********************************************************************
+ * Check whether the current query is a SELECT DISTINCT using an
+ * index in a non-partitioned Spider configuration, with a
+ * projection list that consists solely of the first key prefix
+ * column.
+ *
+ * For a SELECT DISTINCT query using an index in a non-partitioned
+ * Spider configuration, with a projection list that consists
+ * solely of the first key prefix, set the internal row retrieval
+ * limit to avoid visiting each row multiple times.
+ ********************************************************************/
+void ha_spider::check_distinct_key_query()
+{
+  DBUG_ENTER( "ha_spider::check_distinct_key_query" );
+
+  if ( result_list.direct_distinct && !partition_handler->handlers &&
+       result_list.keyread && result_list.check_direct_order_limit )
+  {
+    // SELECT DISTINCT query using an index in a non-partitioned configuration
+    KEY_PART_INFO*  key_part = result_list.key_info->key_part;
+    Field*          key_field = key_part->field;
+
+    if ( is_sole_projection_field( key_field->field_index ) )
+    {
+      // Projection list consists solely of the first key prefix column
+
+      // Set the internal row retrieval limit to avoid visiting each row
+      // multiple times.  This fixes a Spider performance bug that
+      // caused each row to be visited multiple times.
+      result_list.internal_limit = 1;
+    }
+  }
+
+  DBUG_VOID_RETURN;
+}
+
+/********************************************************************
+ * Determine whether the current query's projection list
+ * consists solely of the specified column.
+ *
+ * Params   IN      - field_index:
+ *                    Field index of the column of interest within
+ *                    its table.
+ *
+ * Returns  TRUE    - if the query's projection list consists
+ *                    solely of the specified column.
+ *          FALSE   - otherwise.
+ ********************************************************************/
+bool ha_spider::is_sole_projection_field(
+  uint16 field_index
+) {
+  // NOTE: It is assumed that spider_db_append_select_columns() has already been called
+  //       to build the bitmap of projection fields
+  bool                is_ha_sole_projection_field;
+  uint                loop_index, dbton_id;
+  spider_db_handler*  dbton_hdl;
+  DBUG_ENTER( "ha_spider::is_sole_projection_field" );
+
+  for ( loop_index = 0; loop_index < share->use_sql_dbton_count; loop_index++ )
+  {
+    dbton_id    = share->use_sql_dbton_ids[ loop_index ];
+    dbton_hdl   = dbton_handler[ dbton_id ];
+
+    if ( dbton_hdl->first_link_idx >= 0 )
+    {
+      is_ha_sole_projection_field = dbton_hdl->is_sole_projection_field( field_index );
+      if ( !is_ha_sole_projection_field )
+      {
+        DBUG_RETURN( FALSE );
+      }
+    }
+  }
+
+  DBUG_RETURN( TRUE );
+}
+
+int ha_spider::drop_tmp_tables()
+{
+  int error_num = 0, tmp_error_num, need_mon;
+  DBUG_ENTER("ha_spider::drop_tmp_tables");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (result_list.tmp_tables_created)
+  {
+    int roop_start, roop_end, roop_count, tmp_lock_mode;
+    tmp_lock_mode = spider_conn_lock_mode(this);
+    if (tmp_lock_mode)
+    {
+      /* "for update" or "lock in share mode" */
+      roop_start = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_end = share->link_count;
+    } else {
+      roop_start = search_link_idx;
+      roop_end = search_link_idx + 1;
+    }
+
+    for (roop_count = roop_start; roop_count < roop_end;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (spider_bit_is_set(result_list.tmp_table_created, roop_count))
+      {
+        uint dbton_id = share->use_sql_dbton_ids[roop_count];
+        spider_db_handler *dbton_hdl = dbton_handler[dbton_id];
+        SPIDER_CONN *conn = conns[roop_count];
+        pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
+        if ((error_num = dbton_hdl->set_sql_for_exec(
+          SPIDER_SQL_TYPE_TMP_SQL, roop_count)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        conn->need_mon = &need_mon;
+        DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
+        DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
+        conn->mta_conn_mutex_lock_already = TRUE;
+        conn->mta_conn_mutex_unlock_later = TRUE;
+        if ((tmp_error_num = spider_db_set_names(this, conn, roop_count)))
+        {
+          DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+          DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+          conn->mta_conn_mutex_lock_already = FALSE;
+          conn->mta_conn_mutex_unlock_later = FALSE;
+          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+          pthread_mutex_unlock(&conn->mta_conn_mutex);
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            tmp_error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          error_num = tmp_error_num;
+        }
+        if (!tmp_error_num)
+        {
+          spider_conn_set_timeout_from_share(conn, roop_count,
+            wide_handler->trx->thd, share);
+          if (dbton_hdl->execute_sql(
+            SPIDER_SQL_TYPE_DROP_TMP_TABLE_SQL,
+            conn,
+            -1,
+            &need_mons[roop_count])
+          ) {
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            tmp_error_num = spider_db_errorno(conn);
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              tmp_error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            error_num = tmp_error_num;
+          } else {
+            DBUG_ASSERT(conn->mta_conn_mutex_lock_already);
+            DBUG_ASSERT(conn->mta_conn_mutex_unlock_later);
+            conn->mta_conn_mutex_lock_already = FALSE;
+            conn->mta_conn_mutex_unlock_later = FALSE;
+            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+            pthread_mutex_unlock(&conn->mta_conn_mutex);
+          }
+        }
+        spider_clear_bit(result_list.tmp_table_created, roop_count);
+      }
+    }
+    result_list.tmp_tables_created = FALSE;
+  }
+  DBUG_RETURN(error_num);
+}
+
+void ha_spider::set_error_mode()
+{
+  THD *thd = ha_thd();
+  DBUG_ENTER("ha_spider::set_error_mode");
+  DBUG_PRINT("info",("spider this=%p", this));
+  switch (thd_sql_command(thd))
+  {
+    case SQLCOM_SELECT:
+    case SQLCOM_SHOW_DATABASES:
+    case SQLCOM_SHOW_TABLES:
+    case SQLCOM_SHOW_FIELDS:
+    case SQLCOM_SHOW_KEYS:
+    case SQLCOM_SHOW_VARIABLES:
+    case SQLCOM_SHOW_STATUS:
+    case SQLCOM_SHOW_ENGINE_LOGS:
+    case SQLCOM_SHOW_ENGINE_STATUS:
+    case SQLCOM_SHOW_ENGINE_MUTEX:
+    case SQLCOM_SHOW_PROCESSLIST:
+    case SQLCOM_SHOW_BINLOG_STAT:
+    case SQLCOM_SHOW_SLAVE_STAT:
+    case SQLCOM_SHOW_GRANTS:
+    case SQLCOM_SHOW_CREATE:
+    case SQLCOM_SHOW_CHARSETS:
+    case SQLCOM_SHOW_COLLATIONS:
+    case SQLCOM_SHOW_CREATE_DB:
+    case SQLCOM_SHOW_TABLE_STATUS:
+    case SQLCOM_SHOW_TRIGGERS:
+    case SQLCOM_CHANGE_DB:
+    case SQLCOM_HA_OPEN:
+    case SQLCOM_HA_CLOSE:
+    case SQLCOM_HA_READ:
+    case SQLCOM_SHOW_SLAVE_HOSTS:
+    case SQLCOM_SHOW_BINLOG_EVENTS:
+    case SQLCOM_SHOW_WARNS:
+    case SQLCOM_EMPTY_QUERY:
+    case SQLCOM_SHOW_ERRORS:
+    case SQLCOM_SHOW_STORAGE_ENGINES:
+    case SQLCOM_SHOW_PRIVILEGES:
+    case SQLCOM_HELP:
+    case SQLCOM_SHOW_CREATE_PROC:
+    case SQLCOM_SHOW_CREATE_FUNC:
+    case SQLCOM_SHOW_STATUS_PROC:
+    case SQLCOM_SHOW_STATUS_FUNC:
+    case SQLCOM_SHOW_PROC_CODE:
+    case SQLCOM_SHOW_FUNC_CODE:
+    case SQLCOM_SHOW_AUTHORS:
+    case SQLCOM_SHOW_PLUGINS:
+    case SQLCOM_SHOW_CONTRIBUTORS:
+    case SQLCOM_SHOW_CREATE_EVENT:
+    case SQLCOM_SHOW_EVENTS:
+    case SQLCOM_SHOW_CREATE_TRIGGER:
+    case SQLCOM_SHOW_PROFILE:
+    case SQLCOM_SHOW_PROFILES:
+      error_mode = spider_param_error_read_mode(thd, share->error_read_mode);
+      DBUG_PRINT("info",("spider read error_mode=%d", error_mode));
+      break;
+    default:
+      error_mode = spider_param_error_write_mode(thd, share->error_write_mode);
+      DBUG_PRINT("info",("spider write error_mode=%d", error_mode));
+      break;
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::backup_error_status()
+{
+  THD *thd = ha_thd();
+  DBUG_ENTER("ha_spider::backup_error_status");
+  if (thd)
+    da_status = thd->is_error();
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::check_error_mode(
+  int error_num
+) {
+  THD *thd = ha_thd();
+  DBUG_ENTER("ha_spider::check_error_mode");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider error_num=%d", error_num));
+  if (!thd || !error_mode)
+    DBUG_RETURN(error_num);
+  DBUG_PRINT("info",("spider error reset"));
+  SPIDER_RESTORE_DASTATUS;
+  DBUG_RETURN(0);
+}
+
+int ha_spider::check_error_mode_eof(
+  int error_num
+) {
+  DBUG_ENTER("ha_spider::check_error_mode_eof");
+  DBUG_PRINT("info",("spider this=%p", this));
+  DBUG_PRINT("info",("spider error_num=%d", error_num));
+  if (error_num == HA_ERR_END_OF_FILE)
+    DBUG_RETURN(HA_ERR_END_OF_FILE);
+  if (check_error_mode(error_num))
+    DBUG_RETURN(error_num);
+  DBUG_PRINT("info",("spider result_list.finish_flg = TRUE"));
+  result_list.finish_flg = TRUE;
+  if (result_list.current)
+  {
+    DBUG_PRINT("info",("spider result_list.current->finish_flg = TRUE"));
+    result_list.current->finish_flg = TRUE;
+  }
+  table->status = STATUS_NOT_FOUND;
+  DBUG_RETURN(HA_ERR_END_OF_FILE);
+}
+
+void ha_spider::check_pre_call(
+  bool use_parallel
+) {
+  THD* thd = ha_thd();
+  LEX *lex = thd->lex;
+  st_select_lex *select_lex = spider_get_select_lex(this);
+  int skip_parallel_search =
+    spider_param_skip_parallel_search(thd, share->skip_parallel_search);
+  DBUG_ENTER("ha_spider::check_pre_call");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (
+    (
+      (skip_parallel_search & 1) &&
+      lex->sql_command != SQLCOM_SELECT // such like insert .. select ..
+    ) ||
+    (
+      (skip_parallel_search & 2) &&
+      lex->sql_cache == LEX::SQL_NO_CACHE //  for mysqldump
+    )
+  ) {
+    use_pre_call = FALSE;
+    DBUG_VOID_RETURN;
+  }
+  if (
+    use_parallel &&
+    thd->query_id != partition_handler->parallel_search_query_id
+  ) {
+    partition_handler->parallel_search_query_id = thd->query_id;
+    ++wide_handler->trx->parallel_search_count;
+  }
+  use_pre_call = use_parallel;
+  if (!use_pre_call)
+  {
+    longlong select_limit;
+    longlong offset_limit;
+    spider_get_select_limit_from_select_lex(
+      select_lex, &select_limit, &offset_limit);
+    if (
+      select_lex &&
+      (!select_lex->limit_params.explicit_limit || !select_limit)
+    ) {
+      use_pre_call = TRUE;
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::check_insert_dup_update_pushdown()
+{
+  THD *thd = wide_handler->trx->thd;
+  DBUG_ENTER("ha_spider::check_insert_dup_update_pushdown");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (!spider_param_direct_dup_insert(thd, share->direct_dup_insert))
+  {
+    DBUG_PRINT("info",("spider FALSE by direct_dup_insert"));
+    DBUG_VOID_RETURN;
+  }
+  wide_handler->direct_update_fields = &thd->lex->update_list;
+  wide_handler->direct_update_values = &thd->lex->value_list;
+  if (!append_dup_update_pushdown_sql_part(NULL, 0))
+  {
+    result_list.insert_dup_update_pushdown = TRUE;
+  }
+  DBUG_VOID_RETURN;
+}
+
+
+void ha_spider::sync_from_clone_source_base(
+  ha_spider *spider
+) {
+  uint roop_count2, dbton_id;
+  spider_db_handler *dbton_hdl, *dbton_hdl2;
+  DBUG_ENTER("ha_spider::sync_from_clone_source_base");
+  for (roop_count2 = 0; roop_count2 < share->use_dbton_count; roop_count2++)
+  {
+    dbton_id = share->use_dbton_ids[roop_count2];
+    dbton_hdl = dbton_handler[dbton_id];
+    dbton_hdl2 = spider->dbton_handler[dbton_id];
+    dbton_hdl->first_link_idx = dbton_hdl2->first_link_idx;
+    dbton_hdl->strict_group_by = dbton_hdl2->strict_group_by;
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_first_link_idx()
+{
+  int roop_count, all_link_idx;
+  uint roop_count2, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_first_link_idx");
+  for (roop_count2 = 0; roop_count2 < share->use_dbton_count; roop_count2++)
+  {
+    dbton_id = share->use_dbton_ids[roop_count2];
+    dbton_hdl = dbton_handler[dbton_id];
+    dbton_hdl->first_link_idx = -1;
+    dbton_hdl->strict_group_by = FALSE;
+  }
+  for (
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count, SPIDER_LINK_STATUS_RECOVERY);
+    roop_count < (int) share->link_count;
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, roop_count, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY)
+  ) {
+    all_link_idx = conn_link_idx[roop_count];
+    dbton_id = share->sql_dbton_ids[all_link_idx];
+    if (dbton_id < SPIDER_DBTON_SIZE)
+    {
+      dbton_hdl = dbton_handler[dbton_id];
+      if (dbton_hdl->first_link_idx == -1)
+      {
+        dbton_hdl->first_link_idx = roop_count;
+      }
+      if (share->strict_group_bys[all_link_idx])
+      {
+        dbton_hdl->strict_group_by = TRUE;
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::reset_first_link_idx()
+{
+  int all_link_idx;
+  uint roop_count2, dbton_id;
+  spider_db_handler *dbton_hdl;
+  int lock_mode = spider_conn_lock_mode(this);
+  DBUG_ENTER("ha_spider::reset_first_link_idx");
+  if (!lock_mode)
+  {
+    DBUG_PRINT("info",("spider use only search_link_idx"));
+    for (roop_count2 = 0; roop_count2 < share->use_dbton_count; roop_count2++)
+    {
+      dbton_id = share->use_dbton_ids[roop_count2];
+      dbton_hdl = dbton_handler[dbton_id];
+      dbton_hdl->first_link_idx = -1;
+    }
+    all_link_idx = conn_link_idx[search_link_idx];
+    dbton_id = share->sql_dbton_ids[all_link_idx];
+    if (dbton_id < SPIDER_DBTON_SIZE)
+    {
+      dbton_hdl = dbton_handler[dbton_id];
+      if (dbton_hdl->first_link_idx == -1)
+      {
+        dbton_hdl->first_link_idx = search_link_idx;
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::reset_sql_sql(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  DBUG_ENTER("ha_spider::reset_sql_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    if ((error_num = dbton_handler[dbton_id]->reset_sql(sql_type)))
+    {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  if (sql_type & SPIDER_SQL_TYPE_BULK_UPDATE_SQL)
+  {
+    for (roop_count = 0; roop_count < share->link_count; roop_count++)
+    {
+      result_list.update_sqls[roop_count].length(0);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_tmp_table_and_sql_for_bka(
+  const key_range *start_key
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_tmp_table_and_sql_for_bka");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_tmp_table_and_sql_for_bka(start_key))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::reuse_tmp_table_and_sql_for_bka()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::reuse_tmp_table_and_sql_for_bka");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->reuse_tmp_table_and_sql_for_bka())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_union_table_and_sql_for_bka(
+  const key_range *start_key
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_union_table_and_sql_for_bka");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_union_table_and_sql_for_bka(start_key))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::reuse_union_table_and_sql_for_bka()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::reuse_union_table_and_sql_for_bka");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->reuse_union_table_and_sql_for_bka())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_insert_sql_part()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_insert_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_insert_part())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_update_sql_part()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_update_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_update_part())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_update_set_sql_part()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_update_set_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_update_set_part())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_direct_update_set_sql_part()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_direct_update_set_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_direct_update_set_part())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_dup_update_pushdown_sql_part(
+  const char *alias,
+  uint alias_length
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_dup_update_pushdown_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_dup_update_pushdown_part(
+        alias, alias_length))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_update_columns_sql_part(
+  const char *alias,
+  uint alias_length
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_update_columns_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_update_columns_part(
+        alias, alias_length))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::check_update_columns_sql_part()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::check_update_columns_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->check_update_columns_part())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_delete_sql_part()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_delete_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_delete_part())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_select_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_select_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_select_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_table_select_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_table_select_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_table_select_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_select_sql_part(
+  ulong sql_type,
+  uint idx
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_select_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_key_select_part(sql_type, idx))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_minimum_select_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_minimum_select_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_minimum_select_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_from_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_from_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_from_part(sql_type,
+        dbton_hdl->first_link_idx))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_hint_after_table_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_hint_after_table_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_hint_after_table_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::set_where_pos_sql(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_where_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->set_where_pos(sql_type);
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_where_to_pos_sql(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_where_to_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->set_where_to_pos(sql_type);
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::check_item_type_sql(
+  Item *item
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::check_item_type_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->check_item_type(item))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_values_connector_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_values_connector_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_values_connector_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_values_terminator_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_values_terminator_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_values_terminator_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_union_table_connector_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_union_table_connector_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_union_table_connector_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_union_table_terminator_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_union_table_terminator_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_union_table_terminator_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_column_values_sql_part(
+  const key_range *start_key,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_column_values_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_key_column_values_part(start_key, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_column_values_with_name_sql_part(
+  const key_range *start_key,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_column_values_with_name_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_key_column_values_with_name_part(
+          start_key, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_where_sql_part(
+  const key_range *start_key,
+  const key_range *end_key,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_where_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_key_where_part(start_key, end_key,
+        sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_match_where_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_match_where_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_match_where_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_condition_sql_part(
+  const char *alias,
+  uint alias_length,
+  ulong sql_type,
+  bool test_flg
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_condition_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_condition_part(alias, alias_length,
+        sql_type, test_flg))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_sum_select_sql_part(
+  ulong sql_type,
+  const char *alias,
+  uint alias_length
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_sum_select_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_sum_select_part(sql_type,
+        alias, alias_length))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_match_select_sql_part(
+  ulong sql_type,
+  const char *alias,
+  uint alias_length
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_match_select_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_match_select_part(sql_type,
+        alias, alias_length))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::set_order_pos_sql(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_order_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->set_order_pos(sql_type);
+  }
+  DBUG_VOID_RETURN;
+}
+
+void ha_spider::set_order_to_pos_sql(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_order_to_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->set_order_to_pos(sql_type);
+  }
+  DBUG_VOID_RETURN;
+}
+
+int ha_spider::append_group_by_sql_part(
+  const char *alias,
+  uint alias_length,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_group_by_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_group_by_part(
+        alias, alias_length, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_order_for_merge_with_alias_sql_part(
+  const char *alias,
+  uint alias_length,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_order_for_merge_with_alias_sql_part");
+  if (result_list.direct_aggregate)
+  {
+    st_select_lex *select_lex = spider_get_select_lex(this);
+    ORDER *group = (ORDER *) select_lex->group_list.first;
+    if (!group && *(select_lex->join->sum_funcs))
+    {
+      DBUG_PRINT("info",("spider skip order by"));
+      DBUG_RETURN(0);
+    }
+  }
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_key_order_for_merge_with_alias_part(
+        alias, alias_length, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_order_for_direct_order_limit_with_alias_sql_part(
+  const char *alias,
+  uint alias_length,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_order_for_direct_order_limit_with_alias_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num =
+        dbton_hdl->append_key_order_for_direct_order_limit_with_alias_part(
+          alias, alias_length, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_key_order_with_alias_sql_part(
+  const char *alias,
+  uint alias_length,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_key_order_with_alias_sql_part");
+  if (result_list.direct_aggregate)
+  {
+    st_select_lex *select_lex = spider_get_select_lex(this);
+    ORDER *group = (ORDER *) select_lex->group_list.first;
+    if (!group && *(select_lex->join->sum_funcs))
+    {
+      DBUG_PRINT("info",("spider skip order by"));
+      DBUG_RETURN(0);
+    }
+  }
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_key_order_with_alias_part(
+        alias, alias_length, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_limit_sql_part(
+  longlong offset,
+  longlong limit,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_limit_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_limit_part(offset, limit, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::reappend_limit_sql_part(
+  longlong offset,
+  longlong limit,
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::reappend_limit_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->reappend_limit_part(offset, limit, sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_insert_terminator_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_insert_terminator_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_insert_terminator_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_insert_values_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_insert_values_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_insert_values_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_into_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_into_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_into_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+void ha_spider::set_insert_to_pos_sql(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_insert_to_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->set_insert_to_pos(sql_type);
+  }
+  DBUG_VOID_RETURN;
+}
+
+bool ha_spider::is_bulk_insert_exec_period(
+  bool bulk_end
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::is_bulk_insert_exec_period");
+    for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+    {
+      dbton_id = share->use_sql_dbton_ids[roop_count];
+      dbton_hdl = dbton_handler[dbton_id];
+      if (
+        dbton_hdl->first_link_idx >= 0 &&
+        dbton_hdl->is_bulk_insert_exec_period(bulk_end)
+      ) {
+        DBUG_RETURN(TRUE);
+      }
+    }
+  DBUG_RETURN(FALSE);
+}
+
+int ha_spider::append_select_lock_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_select_lock_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_select_lock_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_union_all_start_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_union_all_start_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_union_all_start_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_union_all_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_union_all_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_union_all_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_union_all_end_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_union_all_end_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_union_all_end_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_multi_range_cnt_sql_part(
+  ulong sql_type,
+  uint multi_range_cnt,
+  bool with_comma
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_multi_range_cnt_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_multi_range_cnt_part(
+        sql_type, multi_range_cnt, with_comma))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_multi_range_cnt_with_name_sql_part(
+  ulong sql_type,
+  uint multi_range_cnt
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_multi_range_cnt_with_name_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_multi_range_cnt_with_name_part(
+        sql_type, multi_range_cnt))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_delete_all_rows_sql_part(
+  ulong sql_type
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_delete_all_rows_sql_part");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_delete_all_rows_part(sql_type))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_update_sql(
+  const TABLE *table,
+  my_ptrdiff_t ptr_diff,
+  bool bulk
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_update");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_update(table, ptr_diff))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  if (!bulk)
+  {
+    DBUG_RETURN(0);
+  }
+
+  for (
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY);
+    roop_count < share->link_count;
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, roop_count, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY)
+  ) {
+    dbton_id = share->sql_dbton_ids[conn_link_idx[roop_count]];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      dbton_hdl->need_copy_for_update(roop_count)
+    ) {
+      if ((error_num = dbton_hdl->append_update(table, ptr_diff, roop_count)))
+      {
+        DBUG_RETURN(error_num);
+      }
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_delete_sql(
+  const TABLE *table,
+  my_ptrdiff_t ptr_diff,
+  bool bulk
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::append_delete");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->append_delete(table, ptr_diff))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  if (!bulk)
+  {
+    DBUG_RETURN(0);
+  }
+
+  for (
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, -1, share->link_count, SPIDER_LINK_STATUS_RECOVERY);
+    roop_count < share->link_count;
+    roop_count = spider_conn_link_idx_next(share->link_statuses,
+      conn_link_idx, roop_count, share->link_count,
+      SPIDER_LINK_STATUS_RECOVERY)
+  ) {
+    dbton_id = share->sql_dbton_ids[conn_link_idx[roop_count]];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      dbton_hdl->need_copy_for_update(roop_count)
+    ) {
+      if ((error_num = dbton_hdl->append_delete(table, ptr_diff, roop_count)))
+      {
+        DBUG_RETURN(error_num);
+      }
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+bool ha_spider::sql_is_filled_up(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::sql_is_filled_up");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      dbton_hdl->sql_is_filled_up(sql_type)
+    ) {
+      DBUG_RETURN(TRUE);
+    }
+  }
+  DBUG_RETURN(FALSE);
+}
+
+bool ha_spider::sql_is_empty(
+  ulong sql_type
+) {
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::sql_is_empty");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      !dbton_hdl->sql_is_empty(sql_type)
+    ) {
+      DBUG_RETURN(FALSE);
+    }
+  }
+  DBUG_RETURN(TRUE);
+}
+
+bool ha_spider::support_multi_split_read_sql()
+{
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::support_multi_split_read_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      !dbton_hdl->support_multi_split_read()
+    ) {
+      DBUG_RETURN(FALSE);
+    }
+  }
+  DBUG_RETURN(TRUE);
+}
+
+bool ha_spider::support_bulk_update_sql()
+{
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::support_bulk_update_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      !dbton_hdl->support_bulk_update()
+    ) {
+      DBUG_RETURN(FALSE);
+    }
+  }
+  DBUG_RETURN(TRUE);
+}
+
+int ha_spider::bulk_tmp_table_insert()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_insert");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->bulk_tmp_table_insert())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  for (roop_count = 0; roop_count < share->link_count; roop_count++)
+  {
+    if (tmp_table[roop_count])
+    {
+      dbton_id = share->sql_dbton_ids[conn_link_idx[roop_count]];
+      dbton_hdl = dbton_handler[dbton_id];
+      if (
+        dbton_hdl->first_link_idx >= 0 &&
+        (error_num = dbton_hdl->bulk_tmp_table_insert(roop_count))
+      ) {
+        DBUG_RETURN(error_num);
+      }
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::bulk_tmp_table_end_bulk_insert()
+{
+  int error_num = 0, error_num2;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_end_bulk_insert");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num2 = dbton_hdl->bulk_tmp_table_end_bulk_insert())
+    ) {
+      error_num = error_num2;
+    }
+  }
+
+  for (roop_count = 0; roop_count < share->link_count; roop_count++)
+  {
+    if (tmp_table[roop_count])
+    {
+      if (
+        (error_num2 = tmp_table[roop_count]->file->ha_end_bulk_insert())
+      ) {
+        error_num = error_num2;
+      }
+    }
+  }
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::bulk_tmp_table_rnd_init()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_rnd_init");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->bulk_tmp_table_rnd_init())
+    ) {
+      goto error_1;
+    }
+  }
+
+  for (roop_count = 0; roop_count < share->link_count; roop_count++)
+  {
+    if (tmp_table[roop_count])
+    {
+      tmp_table[roop_count]->file->extra(HA_EXTRA_CACHE);
+      if (
+        (error_num = tmp_table[roop_count]->file->ha_rnd_init(TRUE))
+      )
+        goto error_2;
+    }
+  }
+  DBUG_RETURN(0);
+
+error_2:
+  for (; roop_count > 0; roop_count--)
+  {
+    if (tmp_table[roop_count - 1])
+    {
+      tmp_table[roop_count - 1]->file->ha_rnd_end();
+    }
+  }
+  roop_count = share->use_sql_dbton_count;
+error_1:
+  for (; roop_count > 0; roop_count--)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count - 1];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->bulk_tmp_table_rnd_end();
+  }
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::bulk_tmp_table_rnd_next()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_rnd_next");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->bulk_tmp_table_rnd_next())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+
+  for (roop_count = 0; roop_count < share->link_count; roop_count++)
+  {
+    if (tmp_table[roop_count])
+    {
+      if (
+        !(error_num = tmp_table[roop_count]->file->ha_rnd_next(
+          tmp_table[roop_count]->record[0]))
+      ) {
+        DBUG_RETURN(error_num);
+      }
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::bulk_tmp_table_rnd_end()
+{
+  int error_num = 0, error_num2;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_rnd_end");
+  for (roop_count = share->link_count; roop_count > 0; roop_count--)
+  {
+    if (tmp_table[roop_count - 1])
+    {
+      if ((error_num2 = tmp_table[roop_count - 1]->file->ha_rnd_end()))
+      {
+        error_num = error_num2;
+      }
+    }
+  }
+
+  for (roop_count = share->use_sql_dbton_count; roop_count > 0; roop_count--)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count - 1];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num2 = dbton_hdl->bulk_tmp_table_rnd_end())
+    ) {
+      error_num = error_num2;
+    }
+  }
+  DBUG_RETURN(error_num);
+}
+
+int ha_spider::mk_bulk_tmp_table_and_bulk_start()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  DBUG_ENTER("ha_spider::mk_bulk_tmp_table_and_bulk_start");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+    {
+      if (dbton_hdl->bulk_tmp_table_created())
+      {
+        DBUG_RETURN(0);
+      } else {
+        break;
+      }
+    }
+  }
+
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->mk_bulk_tmp_table_and_bulk_start())
+    ) {
+      goto error_1;
+    }
+  }
+
+  for (roop_count = 0; roop_count < share->link_count; roop_count++)
+  {
+    dbton_id = share->sql_dbton_ids[conn_link_idx[roop_count]];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      dbton_hdl->need_copy_for_update(roop_count)
+    ) {
+#ifdef SPIDER_use_LEX_CSTRING_for_Field_blob_constructor
+      LEX_CSTRING field_name = {STRING_WITH_LEN("a")};
+      if (
+        !tmp_table[roop_count] &&
+        !(tmp_table[roop_count] = spider_mk_sys_tmp_table(
+          wide_handler->trx->thd, table,
+          &result_list.upd_tmp_tbl_prms[roop_count],
+          &field_name, result_list.update_sqls[roop_count].charset()))
+      )
+#else
+      if (
+        !tmp_table[roop_count] &&
+        !(tmp_table[roop_count] = spider_mk_sys_tmp_table(
+          wide_handler->trx->thd, table,
+          &result_list.upd_tmp_tbl_prms[roop_count], "a",
+          result_list.update_sqls[roop_count].charset()))
+      )
+#endif
+      {
+        error_num = HA_ERR_OUT_OF_MEM;
+        goto error_2;
+      }
+      tmp_table[roop_count]->file->extra(HA_EXTRA_WRITE_CACHE);
+      tmp_table[roop_count]->file->ha_start_bulk_insert((ha_rows) 0);
+    }
+  }
+  DBUG_RETURN(0);
+
+error_2:
+  for (; roop_count > 0; roop_count--)
+  {
+    if (tmp_table[roop_count - 1])
+    {
+      tmp_table[roop_count - 1]->file->ha_end_bulk_insert();
+      spider_rm_sys_tmp_table(wide_handler->trx->thd,
+        tmp_table[roop_count - 1],
+        &result_list.upd_tmp_tbl_prms[roop_count - 1]);
+      tmp_table[roop_count - 1] = NULL;
+    }
+  }
+  roop_count = share->use_sql_dbton_count;
+error_1:
+  for (; roop_count > 0; roop_count--)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count - 1];
+    if (dbton_hdl->first_link_idx >= 0)
+    {
+      dbton_handler[dbton_id]->bulk_tmp_table_end_bulk_insert();
+      dbton_handler[dbton_id]->rm_bulk_tmp_table();
+    }
+  }
+  DBUG_RETURN(error_num);
+}
+
+void ha_spider::rm_bulk_tmp_table()
+{
+  uint roop_count, dbton_id;
+  TABLE **tmp_table = result_list.upd_tmp_tbls;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_rnd_end");
+  for (roop_count = share->link_count; roop_count > 0; roop_count--)
+  {
+    if (tmp_table[roop_count - 1])
+    {
+      spider_rm_sys_tmp_table(wide_handler->trx->thd,
+        tmp_table[roop_count - 1],
+        &result_list.upd_tmp_tbl_prms[roop_count - 1]);
+      tmp_table[roop_count - 1] = NULL;
+    }
+  }
+
+  for (roop_count = share->use_sql_dbton_count; roop_count > 0; roop_count--)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count - 1];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+      dbton_hdl->rm_bulk_tmp_table();
+  }
+  DBUG_VOID_RETURN;
+}
+
+bool ha_spider::bulk_tmp_table_created()
+{
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::bulk_tmp_table_created");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (dbton_hdl->first_link_idx >= 0)
+    {
+      if (dbton_hdl->bulk_tmp_table_created())
+      {
+        DBUG_RETURN(TRUE);
+      }
+    }
+  }
+  DBUG_RETURN(FALSE);
+}
+
+int ha_spider::print_item_type(
+  Item *item,
+  spider_string *str,
+  const char *alias,
+  uint alias_length
+) {
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::print_item_type");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = spider_db_print_item_type(item, NULL, this, str,
+        alias, alias_length, dbton_id, FALSE, NULL))
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::init_union_table_name_pos_sql()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::init_union_table_name_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->init_union_table_name_pos())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::set_union_table_name_pos_sql()
+{
+  int error_num;
+  uint roop_count, dbton_id;
+  spider_db_handler *dbton_hdl;
+  DBUG_ENTER("ha_spider::set_union_table_name_pos_sql");
+  for (roop_count = 0; roop_count < share->use_sql_dbton_count; roop_count++)
+  {
+    dbton_id = share->use_sql_dbton_ids[roop_count];
+    dbton_hdl = dbton_handler[dbton_id];
+    if (
+      dbton_hdl->first_link_idx >= 0 &&
+      (error_num = dbton_hdl->set_union_table_name_pos())
+    ) {
+      DBUG_RETURN(error_num);
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::append_lock_tables_list()
+{
+  int error_num, roop_count;
+  DBUG_ENTER("ha_spider::append_lock_tables_list");
+  DBUG_PRINT("info",("spider lock_table_type=%u",
+    wide_handler->lock_table_type));
+
+  if ((error_num = spider_check_trx_and_get_conn(wide_handler->trx->thd, this,
+    FALSE)))
+  {
+    DBUG_RETURN(error_num);
+  }
+
+  if (wide_handler->lock_table_type == 1)
+  {
+    for (
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_count < (int) share->link_count;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      SPIDER_CONN *conn = conns[roop_count];
+      int appended = 0;
+      if ((error_num = dbton_handler[conn->dbton_id]->
+        append_lock_tables_list(conn, roop_count, &appended)))
+      {
+        DBUG_RETURN(error_num);
+      }
+      if (appended)
+      {
+        conn->table_lock = 2;
+      }
+    }
+  } else if (wide_handler->lock_table_type == 2)
+  {
+    for (
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_count < (int) share->link_count;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (
+        conns[roop_count] &&
+        conns[roop_count]->table_lock != 1 &&
+        spider_param_semi_table_lock(wide_handler->trx->thd,
+          share->semi_table_lock)
+      ) {
+        SPIDER_CONN *conn = conns[roop_count];
+        int appended = 0;
+        if ((error_num = dbton_handler[conn->dbton_id]->
+          append_lock_tables_list(conn, roop_count, &appended)))
+        {
+          DBUG_RETURN(error_num);
+        }
+        if (appended)
+        {
+          conn->table_lock = 3;
+        }
+      }
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::lock_tables()
+{
+  int error_num, roop_count;
+  DBUG_ENTER("ha_spider::lock_tables");
+  DBUG_PRINT("info",("spider lock_table_type=%u",
+    wide_handler->lock_table_type));
+
+    if (!conns[search_link_idx])
+    {
+      my_message(ER_SPIDER_REMOTE_SERVER_GONE_AWAY_NUM,
+        ER_SPIDER_REMOTE_SERVER_GONE_AWAY_STR, MYF(0));
+      DBUG_RETURN(ER_SPIDER_REMOTE_SERVER_GONE_AWAY_NUM);
+    }
+    for (
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_count < (int) share->link_count;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      if (wide_handler->sql_command != SQLCOM_UNLOCK_TABLES)
+      {
+        DBUG_PRINT("info",("spider conns[%d]->join_trx=%u",
+          roop_count, conns[roop_count]->join_trx));
+        if (
+          (!conns[roop_count]->join_trx &&
+            (error_num = spider_internal_start_trx_for_connection(this,
+              conns[roop_count],
+              roop_count)))
+        ) {
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          DBUG_RETURN(check_error_mode(error_num));
+        }
+        reset_first_link_idx();
+      }
+      if (conns[roop_count]->table_lock >= 2)
+      {
+        if (
+          conns[roop_count]->db_conn->have_lock_table_list() &&
+          (error_num = spider_db_lock_tables(this, roop_count))
+        ) {
+          if (
+            share->monitoring_kind[roop_count] &&
+            need_mons[roop_count]
+          ) {
+            error_num = spider_ping_table_mon_from_table(
+                wide_handler->trx,
+                wide_handler->trx->thd,
+                share,
+                roop_count,
+                (uint32) share->monitoring_sid[roop_count],
+                share->table_name,
+                share->table_name_length,
+                conn_link_idx[roop_count],
+                NULL,
+                0,
+                share->monitoring_kind[roop_count],
+                share->monitoring_limit[roop_count],
+                share->monitoring_flag[roop_count],
+                TRUE
+              );
+          }
+          conns[roop_count]->table_lock = 0;
+          DBUG_RETURN(check_error_mode(error_num));
+        }
+        if (conns[roop_count]->table_lock == 2)
+          conns[roop_count]->table_lock = 1;
+      } else if (wide_handler->sql_command == SQLCOM_UNLOCK_TABLES ||
+        spider_param_internal_unlock(wide_handler->trx->thd) == 1)
+      {
+        if (conns[roop_count]->table_lock == 1)
+        {
+          conns[roop_count]->table_lock = 0;
+          if (!conns[roop_count]->trx_start)
+            conns[roop_count]->disable_reconnect = FALSE;
+          if ((error_num = spider_db_unlock_tables(this, roop_count)))
+          {
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  wide_handler->trx,
+                  wide_handler->trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode(error_num));
+          }
+        }
+      }
+    }
+  DBUG_RETURN(0);
+}
+
+int ha_spider::dml_init()
+{
+  int error_num, roop_count;
+  SPIDER_TRX *trx = wide_handler->trx;
+  THD *thd = trx->thd;
+  bool sync_trx_isolation = spider_param_sync_trx_isolation(thd);
+  DBUG_ENTER("ha_spider::dml_init");
+  if (wide_handler->lock_mode == -2)
+  {
+    wide_handler->lock_mode = spider_param_selupd_lock_mode(thd,
+      share->selupd_lock_mode);
+  }
+  if ((error_num = check_access_kind_for_connection(thd,
+    (wide_handler->lock_type >= TL_WRITE_ALLOW_WRITE))))
+  {
+    DBUG_RETURN(error_num);
+  }
+    if (!conns[search_link_idx])
+    {
+      my_message(ER_SPIDER_REMOTE_SERVER_GONE_AWAY_NUM,
+        ER_SPIDER_REMOTE_SERVER_GONE_AWAY_STR, MYF(0));
+      DBUG_RETURN(ER_SPIDER_REMOTE_SERVER_GONE_AWAY_NUM);
+    }
+    if (wide_handler->sql_command == SQLCOM_TRUNCATE)
+      DBUG_RETURN(0);
+    for (
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, -1, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY);
+      roop_count < (int) share->link_count;
+      roop_count = spider_conn_link_idx_next(share->link_statuses,
+        conn_link_idx, roop_count, share->link_count,
+        SPIDER_LINK_STATUS_RECOVERY)
+    ) {
+      DBUG_PRINT("info",("spider conns[%d]->join_trx=%u",
+        roop_count, conns[roop_count]->join_trx));
+      if (
+        (!conns[roop_count]->join_trx &&
+          (error_num = spider_internal_start_trx_for_connection(this,
+            conns[roop_count],
+            roop_count)))
+      ) {
+        if (
+          share->monitoring_kind[roop_count] &&
+          need_mons[roop_count]
+        ) {
+          error_num = spider_ping_table_mon_from_table(
+              trx,
+              trx->thd,
+              share,
+              roop_count,
+              (uint32) share->monitoring_sid[roop_count],
+              share->table_name,
+              share->table_name_length,
+              conn_link_idx[roop_count],
+              NULL,
+              0,
+              share->monitoring_kind[roop_count],
+              share->monitoring_limit[roop_count],
+              share->monitoring_flag[roop_count],
+              TRUE
+            );
+        }
+        DBUG_RETURN(check_error_mode(error_num));
+      }
+      reset_first_link_idx();
+      if (
+        conns[roop_count]->semi_trx_isolation == -2 &&
+        conns[roop_count]->semi_trx_isolation_chk == TRUE &&
+        sync_trx_isolation &&
+        spider_param_semi_trx_isolation(trx->thd) >= 0
+      ) {
+        spider_conn_queue_semi_trx_isolation(conns[roop_count],
+          spider_param_semi_trx_isolation(trx->thd));
+      } else {
+        if (sync_trx_isolation)
+        {
+          if ((error_num = spider_check_and_set_trx_isolation(
+            conns[roop_count], &need_mons[roop_count])))
+          {
+            if (
+              share->monitoring_kind[roop_count] &&
+              need_mons[roop_count]
+            ) {
+              error_num = spider_ping_table_mon_from_table(
+                  trx,
+                  trx->thd,
+                  share,
+                  roop_count,
+                  (uint32) share->monitoring_sid[roop_count],
+                  share->table_name,
+                  share->table_name_length,
+                  conn_link_idx[roop_count],
+                  NULL,
+                  0,
+                  share->monitoring_kind[roop_count],
+                  share->monitoring_limit[roop_count],
+                  share->monitoring_flag[roop_count],
+                  TRUE
+                );
+            }
+            DBUG_RETURN(check_error_mode(error_num));
+          }
+        }
+        conns[roop_count]->semi_trx_isolation = -1;
+      }
+    }
+  if (wide_handler->insert_with_update)
+  {
+    check_insert_dup_update_pushdown();
+  }
+  dml_inited = TRUE;
+  DBUG_RETURN(0);
+}
+