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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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4
sql/sql_lex.h
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@ -1031,6 +1031,10 @@ public:
void clear_index_hints(void) { index_hints= NULL; }
bool is_part_of_union() { return master_unit()->is_union(); }
bool is_top_level_node()
{
return (select_number == 1) && !is_part_of_union();
}
bool optimize_unflattened_subqueries(bool const_only);
/* Set the EXPLAIN type for this subquery. */
void set_explain_type(bool on_the_fly);