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MDEV-3798: EXPLAIN UPDATE/DELETE

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- Add support for EXPLAIN INSERT.
This commit is contained in:
Sergey Petrunya
2013-10-07 17:29:51 +04:00
parent 69393db3d1
commit 98a8642fe8
11 changed files with 201 additions and 62 deletions
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47
sql/sql_insert.cc
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@@ -644,6 +644,36 @@ create_insert_stmt_from_insert_delayed(THD *thd, String *buf)
}
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;
/* See Update_plan::updating_a_view for details */
bool skip= test(table_list->view);
/* Save subquery children */
for (SELECT_LEX_UNIT *unit= thd->lex->select_lex.first_inner_unit();
unit;
unit= unit->next_unit())
{
if (skip)
{
skip= false;
continue;
}
/*
Table elimination doesn't work for INSERTS, but let's still have this
here for consistency
*/
if (!(unit->item && unit->item->eliminated))
explain->add_child(unit->first_select()->select_number);
}
}
/**
INSERT statement implementation
@@ -660,6 +690,7 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
enum_duplicates duplic,
bool ignore)
{
bool retval= true;
int error, res;
bool transactional_table, joins_freed= FALSE;
bool changed;
@@ -780,6 +811,17 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
/* Restore the current context. */
ctx_state.restore_state(context, table_list);
if (thd->lex->unit.first_select()->optimize_unflattened_subqueries(false))
{
goto abort;
}
save_insert_query_plan(thd, table_list);
if (thd->lex->describe)
{
retval= 0;
goto exit_without_my_ok;
}
/*
Fill in the given fields and dump it to the table file
@@ -1128,16 +1170,19 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
DBUG_RETURN(FALSE);
abort:
exit_without_my_ok:
#ifndef EMBEDDED_LIBRARY
if (lock_type == TL_WRITE_DELAYED)
end_delayed_insert(thd);
#endif
if (table != NULL)
table->file->ha_release_auto_increment();
retval= thd->lex->explain->send_explain(thd);
if (!joins_freed)
free_underlaid_joins(thd, &thd->lex->select_lex);
thd->abort_on_warning= 0;
DBUG_RETURN(TRUE);
DBUG_RETURN(retval);
}