1 files changed, 95 insertions, 0 deletions
diff --git a/storage/myisammrg/myrg_rkey.c b/storage/myisammrg/myrg_rkey.c
new file mode 100644
index 00000000..84e8297f
--- /dev/null
+++ b/storage/myisammrg/myrg_rkey.c
@@ -0,0 +1,95 @@
+/* Copyright (c) 2000-2003, 2005-2008 MySQL AB, 2009 Sun Microsystems, Inc.
+   Use is subject to license terms.
+
+   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 St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/* Read record based on a key */
+
+/*
+ *    HA_READ_KEY_EXACT   => SEARCH_BIGGER
+ *    HA_READ_KEY_OR_NEXT => SEARCH_BIGGER
+ *    HA_READ_AFTER_KEY   => SEARCH_BIGGER
+ *    HA_READ_PREFIX      => SEARCH_BIGGER
+ *    HA_READ_KEY_OR_PREV => SEARCH_SMALLER
+ *    HA_READ_BEFORE_KEY  => SEARCH_SMALLER
+ *    HA_READ_PREFIX_LAST => SEARCH_SMALLER
+ */
+
+
+#include "myrg_def.h"
+
+/* todo: we could store some additional info to speedup lookups:
+         column (key, keyseg) can be constant per table
+         it can also be increasing (table1.val > table2.val > ...),
+         or decreasing, <=, >=, etc.
+                                                                   SerG
+*/
+
+int myrg_rkey(MYRG_INFO *info,uchar *buf,int inx, const uchar *key,
+            key_part_map keypart_map, enum ha_rkey_function search_flag)
+{
+  uchar *UNINIT_VAR(key_buff);
+  uint UNINIT_VAR(pack_key_length);
+  uint16 UNINIT_VAR(last_used_keyseg);
+  MYRG_TABLE *table;
+  MI_INFO *mi;
+  int err;
+  DBUG_ENTER("myrg_rkey");
+
+  if (_myrg_init_queue(info,inx,search_flag))
+    DBUG_RETURN(my_errno);
+
+  for (table=info->open_tables ; table != info->end_table ; table++)
+  {
+    mi=table->table;
+
+    if (table == info->open_tables)
+    {
+      err=mi_rkey(mi, 0, inx, key, keypart_map, search_flag);
+      /* Get the saved packed key and packed key length. */
+      key_buff=(uchar*) mi->lastkey+mi->s->base.max_key_length;
+      pack_key_length=mi->pack_key_length;
+      last_used_keyseg= mi->last_used_keyseg;
+    }
+    else
+    {
+      mi->once_flags|= USE_PACKED_KEYS;
+      mi->last_used_keyseg= last_used_keyseg;
+      err=mi_rkey(mi, 0, inx, key_buff, pack_key_length, search_flag);
+    }
+    info->last_used_table=table+1;
+
+    if (err)
+    {
+      if (err == HA_ERR_KEY_NOT_FOUND)
+	continue;
+      DBUG_PRINT("exit", ("err: %d", err));
+      DBUG_RETURN(err);
+    }
+    /* adding to queue */
+    queue_insert(&(info->by_key),(uchar *)table);
+
+  }
+
+  DBUG_PRINT("info", ("tables with matches: %u", info->by_key.elements));
+  if (!info->by_key.elements)
+    DBUG_RETURN(HA_ERR_KEY_NOT_FOUND);
+
+  mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
+  mi->once_flags|= RRND_PRESERVE_LASTINX;
+  DBUG_PRINT("info", ("using table no: %d",
+                      (int) (info->current_table - info->open_tables + 1)));
+  DBUG_DUMP("result key", (uchar*) mi->lastkey, mi->lastkey_length);
+  DBUG_RETURN(_myrg_mi_read_record(mi,buf));
+}