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MWL#182: Explain running statements

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- Address feedback from the second code review.
This commit is contained in:
Sergey Petrunya
2012-07-17 21:52:08 +04:00
parent a49b4c970f
commit 2368f8895d
12 changed files with 201 additions and 184 deletions
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51
sql/sql_class.cc
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@ -2295,15 +2295,6 @@ int select_send::send_data(List<Item> &items)
}
int select_result_explain_buffer::send_data(List<Item> &items)
{
fill_record(thd, dst_table->field, items, TRUE, FALSE);
if ((dst_table->file->ha_write_tmp_row(dst_table->record[0])))
return 1;
return 0;
}
bool select_send::send_eof()
{
/*
@ -3233,43 +3224,6 @@ void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
DBUG_VOID_RETURN;
}
/*
Produce EXPLAIN data.
This function is APC-scheduled to be run in the context of the thread that
we're producing EXPLAIN for.
*/
void Show_explain_request::call_in_target_thread()
{
Query_arena backup_arena;
bool printed_anything= FALSE;
/*
Change the arena because JOIN::print_explain and co. are going to allocate
items. Let them allocate them on our arena.
*/
target_thd->set_n_backup_active_arena((Query_arena*)request_thd,
&backup_arena);
query_str.copy(target_thd->query(),
target_thd->query_length(),
&my_charset_bin);
if (target_thd->lex->unit.print_explain(explain_buf, 0 /* explain flags*/,
&printed_anything))
{
failed_to_produce= TRUE;
}
if (!printed_anything)
failed_to_produce= TRUE;
target_thd->restore_active_arena((Query_arena*)request_thd, &backup_arena);
}
Statement::~Statement()
{
}
@ -3832,6 +3786,7 @@ void THD::restore_backup_open_tables_state(Open_tables_backup *backup)
@retval 1 the user thread has been killed
This is used to signal a storage engine if it should be killed.
See also THD::check_killed().
*/
extern "C" int thd_killed(const MYSQL_THD thd)
@ -3839,6 +3794,10 @@ extern "C" int thd_killed(const MYSQL_THD thd)
if (!thd)
thd= current_thd;
Apc_target *apc_target= (Apc_target*)&thd->apc_target;
if (apc_target->have_apc_requests())
apc_target->process_apc_requests();
if (!(thd->killed & KILL_HARD_BIT))
return 0;
return thd->killed;