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Check of temporary tables hiding for query fetched from QC (BUG#6084)

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This commit is contained in:
bell@sanja.is.com.ua
2004-10-21 23:56:12 +03:00
parent b32ffec8fd
commit ded12c828d
4 changed files with 59 additions and 1 deletions
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32
sql/sql_cache.cc
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@ -971,9 +971,38 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
for (; block_table != block_table_end; block_table++)
{
TABLE_LIST table_list;
bzero((char*) &table_list,sizeof(table_list));
TABLE *tmptable;
Query_cache_table *table = block_table->parent;
/*
Check that we have not temporary tables with same names of tables
of this query. If we have such tables, we will not send data from
query cache, because temporary tables hide real tables by which
query in query cache was made.
*/
for (tmptable= thd->temporary_tables; tmptable ; tmptable= tmptable->next)
{
if (tmptable->key_length - 8 == table->key_len() &&
!memcmp(tmptable->table_cache_key, table->data(),
table->key_len()))
{
DBUG_PRINT("qcache",
("Temporary table detected: '%s.%s'",
table_list.db, table_list.alias));
STRUCT_UNLOCK(&structure_guard_mutex);
/*
We should not store result of this query because it contain
temporary tables => assign following wariable to make check
faster.
*/
thd->safe_to_cache_query=0;
BLOCK_UNLOCK_RD(query_block);
DBUG_RETURN(-1);
}
}
bzero((char*) &table_list,sizeof(table_list));
table_list.db = table->db();
table_list.alias= table_list.real_name= table->table();
if (check_table_access(thd,SELECT_ACL,&table_list,1))
@ -2066,6 +2095,7 @@ Query_cache::insert_table(uint key_len, char *key,
}
char *db = header->db();
header->table(db + db_length + 1);
header->key_len(key_len);
}
Query_cache_block_table *list_root = table_block->table(0);