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MDEV-3798: EXPLAIN UPDATE/DELETE

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Update the SHOW EXPLAIN code to work with the 
new architecture (part#1):
Before, SHOW EXPLAIN operated on real query plan structures, 
which meant it had to check when SELECTs are created/deleted.
SELECTs would call apc_target->enable() when they got a query 
plan and disable() when their query plan was deleted.

Now, Explain data structure becomes available at once (and we
call apc_target->enable()) and then it stays until it is deleted
(when that happens, we call apc_target->disable()).
This commit is contained in:
Sergey Petrunya
2013-10-14 20:09:33 +04:00
parent f67f8fd00f
commit 105e3ae6c9
11 changed files with 76 additions and 45 deletions
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5
sql/sql_insert.cc
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@@ -461,7 +461,8 @@ void upgrade_lock_type(THD *thd, thr_lock_type *lock_type,
if (specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE) ||
thd->variables.max_insert_delayed_threads == 0 ||
thd->locked_tables_mode > LTM_LOCK_TABLES ||
thd->lex->uses_stored_routines())
thd->lex->uses_stored_routines() /*||
thd->lex->describe*/)
{
*lock_type= TL_WRITE;
return;
@@ -649,7 +650,7 @@ static void save_insert_query_plan(THD* thd, TABLE_LIST *table_list)
Explain_insert* explain= new Explain_insert;
explain->table_name.append(table_list->table->alias);
thd->lex->explain->insert_plan= explain;
thd->lex->explain->add_insert_plan(explain);
/* See Update_plan::updating_a_view for details */
bool skip= test(table_list->view);