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MDEV-22535 TABLE::initialize_quick_structures() takes 0.5% in oltp_read_only

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- Removed not needed bzero in void TABLE::initialize_quick_structures().
- Replaced bzero with TRASH_ALLOC() to have this change verfied with
  memory checkers
- Added missing table->quick_keys.is_set in table_cond_selectivity()
This commit is contained in:
Monty
2020-06-26 13:42:04 +03:00
parent 1df1a63924
commit 3f2044ae99
2 changed files with 5 additions and 5 deletions
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2
sql/sql_select.cc
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@ -8573,7 +8573,7 @@ double table_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
/*
Check if we have a prefix of key=const that matches a quick select.
*/
if (!is_hash_join_key_no(key))
if (!is_hash_join_key_no(key) && table->quick_keys.is_set(key))
{
key_part_map quick_key_map= (key_part_map(1) << table->quick_key_parts[key]) - 1;
if (table->quick_rows[key] &&

8
sql/table.cc
View File

@ -9358,10 +9358,10 @@ bool TABLE::export_structure(THD *thd, Row_definition_list *defs)
void TABLE::initialize_quick_structures()
{
bzero(quick_rows, sizeof(quick_rows));
bzero(quick_key_parts, sizeof(quick_key_parts));
bzero(quick_costs, sizeof(quick_costs));
bzero(quick_n_ranges, sizeof(quick_n_ranges));
TRASH_ALLOC(quick_rows, sizeof(quick_rows));
TRASH_ALLOC(quick_key_parts, sizeof(quick_key_parts));
TRASH_ALLOC(quick_costs, sizeof(quick_costs));
TRASH_ALLOC(quick_n_ranges, sizeof(quick_n_ranges));
}
/*