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BUG#20256 - LOCK WRITE - MyISAM

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Only MyISAM tables locked with LOCK TABLES ... WRITE were affected.

A query that is optimized with index_merge doesn't reflect rows
inserted within LOCK TABLES.

MyISAM doesn't flush a state within LOCK TABLES. index_merge
optimization creates a copy of the handler, which thus gets
outdated MyISAM state.

New handler->clone() method is introduced to fix this problem.
For non-MyISAM storage engines it allocates a handler and opens
it with ha_open(). For MyISAM it additionally copies MyISAM state
pointer to cloned handler.
This commit is contained in:
svoj@april.(none)
2006-09-12 18:25:35 +05:00
parent 50192889a4
commit 44f167ee1d
7 changed files with 83 additions and 4 deletions
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9
sql/handler.cc
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@ -1372,6 +1372,15 @@ int ha_delete_table(THD *thd, enum db_type table_type, const char *path,
/****************************************************************************
** General handler functions
****************************************************************************/
handler *handler::clone(MEM_ROOT *mem_root)
{
handler *new_handler= get_new_handler(table, mem_root, table->s->db_type);
if (new_handler && !new_handler->ha_open(table->s->path, table->db_stat,
HA_OPEN_IGNORE_IF_LOCKED))
return new_handler;
return NULL;
}
/* Open database-handler. Try O_RDONLY if can't open as O_RDWR */
/* Don't wait for locks if not HA_OPEN_WAIT_IF_LOCKED is set */