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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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8
sql/sql_lex.cc
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@@ -4276,11 +4276,15 @@ int st_select_lex_unit::save_union_explain(Explain_query *output)
for (SELECT_LEX *sl= first; sl; sl= sl->next_select())
eu->add_select(sl->select_number);
eu->fake_select_type= "UNION RESULT";
eu->using_filesort= test(global_parameters->order_list.first);
// Save the UNION node
output->add_node(eu);
eu->fake_select_type= "UNION RESULT";
eu->using_filesort= test(global_parameters->order_list.first);
if (eu->get_select_id() == 1)
output->query_plan_ready();
return 0;
}