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MDEV-25682 Explain shows an execution plan different from actually executed

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If a select query contained an ORDER BY clause that followed a LIMIT clause
or an ORDER BY clause or ORDER BY with LIMIT the EXPLAIN output for the
query showed an execution plan different from that was actually executed.

Approved by Roman Nozdrin <roman.nozdrin@mariadb.com>
This commit is contained in:
Igor Babaev
2021-05-14 16:43:36 -07:00
parent e607f3398c
commit 677f1ef6f0
3 changed files with 42 additions and 1 deletions
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2
sql/sql_select.cc
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@ -25332,7 +25332,7 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
sl->options|= SELECT_DESCRIBE;
}
if (unit->is_union())
if (unit->is_union() || unit->fake_select_lex)
{
if (unit->union_needs_tmp_table() && unit->fake_select_lex)
{