diff options
Diffstat (limited to 'storage/heap/ha_heap.cc')
| -rw-r--r-- | storage/heap/ha_heap.cc | 850 |
1 files changed, 850 insertions, 0 deletions
diff --git a/storage/heap/ha_heap.cc b/storage/heap/ha_heap.cc new file mode 100644 index 00000000..5f7f0c1e --- /dev/null +++ b/storage/heap/ha_heap.cc @@ -0,0 +1,850 @@ +/* + Copyright (c) 2000, 2011, Oracle and/or its affiliates + + 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 */ + + +#ifdef USE_PRAGMA_IMPLEMENTATION +#pragma implementation // gcc: Class implementation +#endif + +#define MYSQL_SERVER 1 +#include "heapdef.h" +#include "sql_priv.h" +#include "sql_plugin.h" +#include "ha_heap.h" +#include "sql_base.h" + +static handler *heap_create_handler(handlerton *, TABLE_SHARE *, MEM_ROOT *); +static int heap_prepare_hp_create_info(TABLE *, bool, HP_CREATE_INFO *); + + +static int heap_panic(handlerton *hton, ha_panic_function flag) +{ + return hp_panic(flag); +} + + +static int heap_drop_table(handlerton *hton, const char *path) +{ + int error= heap_delete_table(path); + return error == ENOENT ? -1 : error; +} + +int heap_init(void *p) +{ + handlerton *heap_hton; + + init_heap_psi_keys(); + + heap_hton= (handlerton *)p; + heap_hton->db_type= DB_TYPE_HEAP; + heap_hton->create= heap_create_handler; + heap_hton->panic= heap_panic; + heap_hton->drop_table= heap_drop_table; + heap_hton->flags= HTON_CAN_RECREATE; + + return 0; +} + +static handler *heap_create_handler(handlerton *hton, + TABLE_SHARE *table, + MEM_ROOT *mem_root) +{ + return new (mem_root) ha_heap(hton, table); +} + + +/***************************************************************************** +** HEAP tables +*****************************************************************************/ + +ha_heap::ha_heap(handlerton *hton, TABLE_SHARE *table_arg) + :handler(hton, table_arg), file(0), records_changed(0), key_stat_version(0), + internal_table(0) +{} + +/* + Hash index statistics is updated (copied from HP_KEYDEF::hash_buckets to + rec_per_key) after 1/HEAP_STATS_UPDATE_THRESHOLD fraction of table records + have been inserted/updated/deleted. delete_all_rows() and table flush cause + immediate update. + + NOTE + hash index statistics must be updated when number of table records changes + from 0 to non-zero value and vice versa. Otherwise records_in_range may + erroneously return 0 and 'range' may miss records. +*/ +#define HEAP_STATS_UPDATE_THRESHOLD 10 + +int ha_heap::open(const char *name, int mode, uint test_if_locked) +{ + internal_table= MY_TEST(test_if_locked & HA_OPEN_INTERNAL_TABLE); + if (internal_table || (!(file= heap_open(name, mode)) && my_errno == ENOENT)) + { + HP_CREATE_INFO create_info; + my_bool created_new_share; + int rc; + file= 0; + if (heap_prepare_hp_create_info(table, internal_table, &create_info)) + goto end; + create_info.pin_share= TRUE; + + rc= heap_create(name, &create_info, &internal_share, &created_new_share); + my_free(create_info.keydef); + if (rc) + goto end; + + implicit_emptied= MY_TEST(created_new_share); + if (internal_table) + file= heap_open_from_share(internal_share, mode); + else + file= heap_open_from_share_and_register(internal_share, mode); + + if (!file) + { + heap_release_share(internal_share, internal_table); + goto end; + } + } + + ref_length= sizeof(HEAP_PTR); + /* Initialize variables for the opened table */ + set_keys_for_scanning(); + /* + We cannot run update_key_stats() here because we do not have a + lock on the table. The 'records' count might just be changed + temporarily at this moment and we might get wrong statistics (Bug + #10178). Instead we request for update. This will be done in + ha_heap::info(), which is always called before key statistics are + used. + */ + key_stat_version= file->s->key_stat_version-1; +end: + return (file ? 0 : 1); +} + +int ha_heap::close(void) +{ + return internal_table ? hp_close(file) : heap_close(file); +} + + +/* + Create a copy of this table + + DESCRIPTION + Do same as default implementation but use file->s->name instead of + table->s->path. This is needed by Windows where the clone() call sees + '/'-delimited path in table->s->path, while ha_heap::open() was called + with '\'-delimited path. +*/ + +handler *ha_heap::clone(const char *name, MEM_ROOT *mem_root) +{ + handler *new_handler= get_new_handler(table->s, mem_root, ht); + if (new_handler && !new_handler->ha_open(table, file->s->name, table->db_stat, + HA_OPEN_IGNORE_IF_LOCKED)) + return new_handler; + return NULL; /* purecov: inspected */ +} + + +/* + Compute which keys to use for scanning + + SYNOPSIS + set_keys_for_scanning() + no parameter + + DESCRIPTION + Set the bitmap btree_keys, which is used when the upper layers ask + which keys to use for scanning. For each btree index the + corresponding bit is set. + + RETURN + void +*/ + +void ha_heap::set_keys_for_scanning(void) +{ + btree_keys.clear_all(); + for (uint i= 0 ; i < table->s->keys ; i++) + { + if (table->key_info[i].algorithm == HA_KEY_ALG_BTREE) + btree_keys.set_bit(i); + } +} + + +int ha_heap::can_continue_handler_scan() +{ + int error= 0; + if ((file->key_version != file->s->key_version && inited == INDEX) || + (file->file_version != file->s->file_version && inited == RND)) + { + /* Data changed, not safe to do index or rnd scan */ + error= HA_ERR_RECORD_CHANGED; + } + return error; +} + + +void ha_heap::update_key_stats() +{ + for (uint i= 0; i < table->s->keys; i++) + { + KEY *key=table->key_info+i; + if (!key->rec_per_key) + continue; + if (key->algorithm != HA_KEY_ALG_BTREE) + { + if (key->flags & HA_NOSAME) + key->rec_per_key[key->user_defined_key_parts-1]= 1; + else + { + ha_rows hash_buckets= file->s->keydef[i].hash_buckets; + ulong no_records= hash_buckets ? (ulong)(file->s->records/hash_buckets) : 2; + if (no_records < 2) + no_records= 2; + key->rec_per_key[key->user_defined_key_parts-1]= no_records; + } + } + } + records_changed= 0; + /* At the end of update_key_stats() we can proudly claim they are OK. */ + key_stat_version= file->s->key_stat_version; +} + + +int ha_heap::write_row(const uchar * buf) +{ + int res; + if (table->next_number_field && buf == table->record[0]) + { + if ((res= update_auto_increment())) + return res; + } + res= heap_write(file,buf); + if (!res && (++records_changed*HEAP_STATS_UPDATE_THRESHOLD > + file->s->records)) + { + /* + We can perform this safely since only one writer at the time is + allowed on the table. + */ + records_changed= 0; + file->s->key_stat_version++; + } + return res; +} + +int ha_heap::update_row(const uchar * old_data, const uchar * new_data) +{ + int res; + res= heap_update(file,old_data,new_data); + if (!res && ++records_changed*HEAP_STATS_UPDATE_THRESHOLD > + file->s->records) + { + /* + We can perform this safely since only one writer at the time is + allowed on the table. + */ + records_changed= 0; + file->s->key_stat_version++; + } + return res; +} + +int ha_heap::delete_row(const uchar * buf) +{ + int res; + res= heap_delete(file,buf); + if (!res && table->s->tmp_table == NO_TMP_TABLE && + ++records_changed*HEAP_STATS_UPDATE_THRESHOLD > file->s->records) + { + /* + We can perform this safely since only one writer at the time is + allowed on the table. + */ + records_changed= 0; + file->s->key_stat_version++; + } + return res; +} + +int ha_heap::index_read_map(uchar *buf, const uchar *key, + key_part_map keypart_map, + enum ha_rkey_function find_flag) +{ + DBUG_ASSERT(inited==INDEX); + int error = heap_rkey(file,buf,active_index, key, keypart_map, find_flag); + return error; +} + +int ha_heap::index_read_last_map(uchar *buf, const uchar *key, + key_part_map keypart_map) +{ + DBUG_ASSERT(inited==INDEX); + int error= heap_rkey(file, buf, active_index, key, keypart_map, + HA_READ_PREFIX_LAST); + return error; +} + +int ha_heap::index_read_idx_map(uchar *buf, uint index, const uchar *key, + key_part_map keypart_map, + enum ha_rkey_function find_flag) +{ + int error = heap_rkey(file, buf, index, key, keypart_map, find_flag); + return error; +} + +int ha_heap::index_next(uchar * buf) +{ + DBUG_ASSERT(inited==INDEX); + int error=heap_rnext(file,buf); + return error; +} + +int ha_heap::index_prev(uchar * buf) +{ + DBUG_ASSERT(inited==INDEX); + int error=heap_rprev(file,buf); + return error; +} + +int ha_heap::index_first(uchar * buf) +{ + DBUG_ASSERT(inited==INDEX); + int error=heap_rfirst(file, buf, active_index); + return error; +} + +int ha_heap::index_last(uchar * buf) +{ + DBUG_ASSERT(inited==INDEX); + int error=heap_rlast(file, buf, active_index); + return error; +} + +int ha_heap::rnd_init(bool scan) +{ + return scan ? heap_scan_init(file) : 0; +} + +int ha_heap::rnd_next(uchar *buf) +{ + int error=heap_scan(file, buf); + return error; +} + +int ha_heap::rnd_pos(uchar * buf, uchar *pos) +{ + int error; + HEAP_PTR heap_position; + memcpy(&heap_position, pos, sizeof(HEAP_PTR)); + error=heap_rrnd(file, buf, heap_position); + return error; +} + +void ha_heap::position(const uchar *record) +{ + *(HEAP_PTR*) ref= heap_position(file); // Ref is aligned +} + +int ha_heap::info(uint flag) +{ + HEAPINFO hp_info; + + (void) heap_info(file,&hp_info,flag); + + errkey= hp_info.errkey; + stats.records= hp_info.records; + stats.deleted= hp_info.deleted; + stats.mean_rec_length= hp_info.reclength; + stats.data_file_length= hp_info.data_length; + stats.index_file_length= hp_info.index_length; + stats.max_data_file_length= hp_info.max_records * hp_info.reclength; + stats.delete_length= hp_info.deleted * hp_info.reclength; + stats.create_time= (ulong) hp_info.create_time; + if (flag & HA_STATUS_AUTO) + stats.auto_increment_value= hp_info.auto_increment; + /* + If info() is called for the first time after open(), we will still + have to update the key statistics. Hoping that a table lock is now + in place. + */ + if (key_stat_version != file->s->key_stat_version) + update_key_stats(); + return 0; +} + + +int ha_heap::extra(enum ha_extra_function operation) +{ + return heap_extra(file,operation); +} + + +int ha_heap::reset() +{ + return heap_reset(file); +} + + +int ha_heap::delete_all_rows() +{ + heap_clear(file); + if (table->s->tmp_table == NO_TMP_TABLE) + { + /* + We can perform this safely since only one writer at the time is + allowed on the table. + */ + file->s->key_stat_version++; + } + return 0; +} + + +int ha_heap::reset_auto_increment(ulonglong value) +{ + file->s->auto_increment= value; + return 0; +} + + +int ha_heap::external_lock(THD *thd, int lock_type) +{ +#if !defined(DBUG_OFF) && defined(EXTRA_DEBUG) + if (lock_type == F_UNLCK && file->s->changed && heap_check_heap(file, 0)) + return HA_ERR_CRASHED; +#endif + return 0; // No external locking +} + + +/* + Disable indexes. + + SYNOPSIS + disable_indexes() + mode mode of operation: + HA_KEY_SWITCH_NONUNIQ disable all non-unique keys + HA_KEY_SWITCH_ALL disable all keys + HA_KEY_SWITCH_NONUNIQ_SAVE dis. non-uni. and make persistent + HA_KEY_SWITCH_ALL_SAVE dis. all keys and make persistent + + DESCRIPTION + Disable indexes and clear keys to use for scanning. + + IMPLEMENTATION + HA_KEY_SWITCH_NONUNIQ is not implemented. + HA_KEY_SWITCH_NONUNIQ_SAVE is not implemented with HEAP. + HA_KEY_SWITCH_ALL_SAVE is not implemented with HEAP. + + RETURN + 0 ok + HA_ERR_WRONG_COMMAND mode not implemented. +*/ + +int ha_heap::disable_indexes(uint mode) +{ + int error; + + if (mode == HA_KEY_SWITCH_ALL) + { + if (!(error= heap_disable_indexes(file))) + set_keys_for_scanning(); + } + else + { + /* mode not implemented */ + error= HA_ERR_WRONG_COMMAND; + } + return error; +} + + +/* + Enable indexes. + + SYNOPSIS + enable_indexes() + mode mode of operation: + HA_KEY_SWITCH_NONUNIQ enable all non-unique keys + HA_KEY_SWITCH_ALL enable all keys + HA_KEY_SWITCH_NONUNIQ_SAVE en. non-uni. and make persistent + HA_KEY_SWITCH_ALL_SAVE en. all keys and make persistent + + DESCRIPTION + Enable indexes and set keys to use for scanning. + The indexes might have been disabled by disable_index() before. + The function works only if both data and indexes are empty, + since the heap storage engine cannot repair the indexes. + To be sure, call handler::delete_all_rows() before. + + IMPLEMENTATION + HA_KEY_SWITCH_NONUNIQ is not implemented. + HA_KEY_SWITCH_NONUNIQ_SAVE is not implemented with HEAP. + HA_KEY_SWITCH_ALL_SAVE is not implemented with HEAP. + + RETURN + 0 ok + HA_ERR_CRASHED data or index is non-empty. Delete all rows and retry. + HA_ERR_WRONG_COMMAND mode not implemented. +*/ + +int ha_heap::enable_indexes(uint mode) +{ + int error; + + if (mode == HA_KEY_SWITCH_ALL) + { + if (!(error= heap_enable_indexes(file))) + set_keys_for_scanning(); + } + else + { + /* mode not implemented */ + error= HA_ERR_WRONG_COMMAND; + } + return error; +} + + +/* + Test if indexes are disabled. + + SYNOPSIS + indexes_are_disabled() + no parameters + + RETURN + 0 indexes are not disabled + 1 all indexes are disabled + [2 non-unique indexes are disabled - NOT YET IMPLEMENTED] +*/ + +int ha_heap::indexes_are_disabled(void) +{ + return heap_indexes_are_disabled(file); +} + +THR_LOCK_DATA **ha_heap::store_lock(THD *thd, + THR_LOCK_DATA **to, + enum thr_lock_type lock_type) +{ + if (lock_type != TL_IGNORE && file->lock.type == TL_UNLOCK) + file->lock.type=lock_type; + *to++= &file->lock; + return to; +} + +/* + We have to ignore ENOENT entries as the HEAP table is created on open and + not when doing a CREATE on the table. +*/ + +int ha_heap::delete_table(const char *name) +{ + return heap_drop_table(0, name); +} + + +void ha_heap::drop_table(const char *name) +{ + file->s->delete_on_close= 1; + ha_close(); +} + + +int ha_heap::rename_table(const char * from, const char * to) +{ + return heap_rename(from,to); +} + + +ha_rows ha_heap::records_in_range(uint inx, const key_range *min_key, + const key_range *max_key, page_range *pages) +{ + KEY *key=table->key_info+inx; + if (key->algorithm == HA_KEY_ALG_BTREE) + return hp_rb_records_in_range(file, inx, min_key, max_key); + + if (!min_key || !max_key || + min_key->length != max_key->length || + min_key->length != key->key_length || + min_key->flag != HA_READ_KEY_EXACT || + max_key->flag != HA_READ_AFTER_KEY) + return HA_POS_ERROR; // Can only use exact keys + + if (stats.records <= 1) + return stats.records; + + /* Assert that info() did run. We need current statistics here. */ + DBUG_ASSERT(key_stat_version == file->s->key_stat_version); + return key->rec_per_key[key->user_defined_key_parts-1]; +} + + +static int heap_prepare_hp_create_info(TABLE *table_arg, bool internal_table, + HP_CREATE_INFO *hp_create_info) +{ + TABLE_SHARE *share= table_arg->s; + uint key, parts, mem_per_row= 0, keys= share->keys; + uint auto_key= 0, auto_key_type= 0; + ha_rows max_rows; + HP_KEYDEF *keydef; + HA_KEYSEG *seg; + bool found_real_auto_increment= 0; + + bzero(hp_create_info, sizeof(*hp_create_info)); + + for (key= parts= 0; key < keys; key++) + parts+= table_arg->key_info[key].user_defined_key_parts; + + if (!my_multi_malloc(hp_key_memory_HP_KEYDEF, + MYF(MY_WME | MY_THREAD_SPECIFIC), + &keydef, keys * sizeof(HP_KEYDEF), + &seg, parts * sizeof(HA_KEYSEG), + NULL)) + return my_errno; + for (key= 0; key < keys; key++) + { + KEY *pos= table_arg->key_info+key; + KEY_PART_INFO *key_part= pos->key_part; + KEY_PART_INFO *key_part_end= key_part + pos->user_defined_key_parts; + + keydef[key].keysegs= (uint) pos->user_defined_key_parts; + keydef[key].flag= (pos->flags & (HA_NOSAME | HA_NULL_ARE_EQUAL)); + keydef[key].seg= seg; + + switch (pos->algorithm) { + case HA_KEY_ALG_UNDEF: + case HA_KEY_ALG_HASH: + keydef[key].algorithm= HA_KEY_ALG_HASH; + mem_per_row+= sizeof(char*) * 2; // = sizeof(HASH_INFO) + break; + case HA_KEY_ALG_BTREE: + keydef[key].algorithm= HA_KEY_ALG_BTREE; + mem_per_row+=sizeof(TREE_ELEMENT)+pos->key_length+sizeof(char*); + break; + default: + DBUG_ASSERT(0); // cannot happen + } + + for (; key_part != key_part_end; key_part++, seg++) + { + Field *field= key_part->field; + + if (pos->algorithm == HA_KEY_ALG_BTREE) + seg->type= field->key_type(); + else + { + if ((seg->type = field->key_type()) != (int) HA_KEYTYPE_TEXT && + seg->type != HA_KEYTYPE_VARTEXT1 && + seg->type != HA_KEYTYPE_VARTEXT2 && + seg->type != HA_KEYTYPE_VARBINARY1 && + seg->type != HA_KEYTYPE_VARBINARY2 && + seg->type != HA_KEYTYPE_BIT) + seg->type= HA_KEYTYPE_BINARY; + } + seg->start= (uint) key_part->offset; + seg->length= (uint) key_part->length; + seg->flag= key_part->key_part_flag; + + if (field->flags & (ENUM_FLAG | SET_FLAG)) + seg->charset= &my_charset_bin; + else + seg->charset= field->charset_for_protocol(); + if (field->null_ptr) + { + seg->null_bit= field->null_bit; + seg->null_pos= (uint) (field->null_ptr - (uchar*) table_arg->record[0]); + } + else + { + seg->null_bit= 0; + seg->null_pos= 0; + } + if (field->flags & AUTO_INCREMENT_FLAG && + table_arg->found_next_number_field && + key == share->next_number_index) + { + /* + Store key number and type for found auto_increment key + We have to store type as seg->type can differ from it + */ + auto_key= key+ 1; + auto_key_type= field->key_type(); + } + if (seg->type == HA_KEYTYPE_BIT) + { + seg->bit_length= ((Field_bit *) field)->bit_len; + seg->bit_start= ((Field_bit *) field)->bit_ofs; + seg->bit_pos= (uint) (((Field_bit *) field)->bit_ptr - + (uchar*) table_arg->record[0]); + } + else + { + seg->bit_length= seg->bit_start= 0; + seg->bit_pos= 0; + } + } + } + mem_per_row+= MY_ALIGN(MY_MAX(share->reclength, sizeof(char*)) + 1, sizeof(char*)); + if (table_arg->found_next_number_field) + { + keydef[share->next_number_index].flag|= HA_AUTO_KEY; + found_real_auto_increment= share->next_number_key_offset == 0; + } + hp_create_info->auto_key= auto_key; + hp_create_info->auto_key_type= auto_key_type; + hp_create_info->max_table_size=current_thd->variables.max_heap_table_size; + hp_create_info->with_auto_increment= found_real_auto_increment; + hp_create_info->internal_table= internal_table; + + max_rows= (ha_rows) (hp_create_info->max_table_size / mem_per_row); + if (share->max_rows && share->max_rows < max_rows) + max_rows= share->max_rows; + + hp_create_info->max_records= (ulong) MY_MIN(max_rows, ULONG_MAX); + hp_create_info->min_records= (ulong) MY_MIN(share->min_rows, ULONG_MAX); + hp_create_info->keys= share->keys; + hp_create_info->reclength= share->reclength; + hp_create_info->keydef= keydef; + return 0; +} + + +int ha_heap::create(const char *name, TABLE *table_arg, + HA_CREATE_INFO *create_info) +{ + int error; + my_bool created; + HP_CREATE_INFO hp_create_info; + + error= heap_prepare_hp_create_info(table_arg, internal_table, + &hp_create_info); + if (error) + return error; + hp_create_info.auto_increment= (create_info->auto_increment_value ? + create_info->auto_increment_value - 1 : 0); + error= heap_create(name, &hp_create_info, &internal_share, &created); + my_free(hp_create_info.keydef); + DBUG_ASSERT(file == 0); + return (error); +} + + +void ha_heap::update_create_info(HA_CREATE_INFO *create_info) +{ + table->file->info(HA_STATUS_AUTO); + if (!(create_info->used_fields & HA_CREATE_USED_AUTO)) + create_info->auto_increment_value= stats.auto_increment_value; +} + +void ha_heap::get_auto_increment(ulonglong offset, ulonglong increment, + ulonglong nb_desired_values, + ulonglong *first_value, + ulonglong *nb_reserved_values) +{ + ha_heap::info(HA_STATUS_AUTO); + *first_value= stats.auto_increment_value; + /* such table has only table-level locking so reserves up to +inf */ + *nb_reserved_values= ULONGLONG_MAX; +} + + +bool ha_heap::check_if_incompatible_data(HA_CREATE_INFO *info, + uint table_changes) +{ + /* Check that auto_increment value was not changed */ + if ((info->used_fields & HA_CREATE_USED_AUTO && + info->auto_increment_value != 0) || + table_changes == IS_EQUAL_NO || + table_changes & IS_EQUAL_PACK_LENGTH) // Not implemented yet + return COMPATIBLE_DATA_NO; + return COMPATIBLE_DATA_YES; +} + + +/** + Find record by unique index (used in temporary tables with the index) + + @param record (IN|OUT) the record to find + @param unique_idx (IN) number of index (for this engine) + + @note It is like hp_search but uses function for raw where hp_search + uses functions for index. + + @retval 0 OK + @retval 1 Not found + @retval -1 Error +*/ + +int ha_heap::find_unique_row(uchar *record, uint unique_idx) +{ + DBUG_ENTER("ha_heap::find_unique_row"); + HP_SHARE *share= file->s; + DBUG_ASSERT(inited==NONE); + HP_KEYDEF *keyinfo= share->keydef + unique_idx; + DBUG_ASSERT(keyinfo->algorithm == HA_KEY_ALG_HASH); + DBUG_ASSERT(keyinfo->flag & HA_NOSAME); + if (!share->records) + DBUG_RETURN(1); // not found + HASH_INFO *pos= hp_find_hash(&keyinfo->block, + hp_mask(hp_rec_hashnr(keyinfo, record), + share->blength, share->records)); + do + { + if (!hp_rec_key_cmp(keyinfo, pos->ptr_to_rec, record)) + { + file->current_hash_ptr= pos; + file->current_ptr= pos->ptr_to_rec; + file->update = HA_STATE_AKTIV; + /* + We compare it only by record in the index, so better to read all + records. + */ + memcpy(record, file->current_ptr, (size_t) share->reclength); + + DBUG_RETURN(0); // found and position set + } + } + while ((pos= pos->next_key)); + DBUG_RETURN(1); // not found +} + +struct st_mysql_storage_engine heap_storage_engine= +{ MYSQL_HANDLERTON_INTERFACE_VERSION }; + +maria_declare_plugin(heap) +{ + MYSQL_STORAGE_ENGINE_PLUGIN, + &heap_storage_engine, + "MEMORY", + "MySQL AB", + "Hash based, stored in memory, useful for temporary tables", + PLUGIN_LICENSE_GPL, + heap_init, + NULL, + 0x0100, /* 1.0 */ + NULL, /* status variables */ + NULL, /* system variables */ + "1.0", /* string version */ + MariaDB_PLUGIN_MATURITY_STABLE /* maturity */ +} +maria_declare_plugin_end; |