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| author | Varun Gupta <varunraiko1803@gmail.com> | 2018-11-09 19:53:40 +0530 |
|---|---|---|
| committer | Varun Gupta <varunraiko1803@gmail.com> | 2018-11-10 13:13:26 +0530 |
| commit | a12b8ac8e9636f8258bcb17a0845b9317d870fd9 (patch) | |
| tree | 0a4ce4a22a73d8922fffc0437a8ddc16f102c11d /sql/sql_select.cc | |
| parent | 5cfb043d2919439fccfa350edd9a3fdb4aaf229b (diff) | |
| download | mariadb-git-a12b8ac8e9636f8258bcb17a0845b9317d870fd9.tar.gz | |
MDEV-12575: Server crash in AGGR_OP::put_record or in JOIN_CACHE::free or Invalid write in JOIN::make_aggr_tables_info
During the optimize state of a query, we come know that the result set
would atmost contain one row, then for such a query we don't need
to compute GROUP BY, ORDER BY and DISTINCT.
Diffstat (limited to 'sql/sql_select.cc')
| -rw-r--r-- | sql/sql_select.cc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc index 0cdecf1bf2e..db3ed8a1aa9 100644 --- a/sql/sql_select.cc +++ b/sql/sql_select.cc @@ -2245,6 +2245,18 @@ setup_subq_exit: if (!tables_list || !table_count) { choose_tableless_subquery_plan(); + + /* The output has atmost one row */ + if (group_list) + { + group_list= NULL; + group_optimized_away= 1; + rollup.state= ROLLUP::STATE_NONE; + } + order= NULL; + simple_order= TRUE; + select_distinct= FALSE; + if (select_lex->have_window_funcs()) { if (!(join_tab= (JOIN_TAB*) thd->alloc(sizeof(JOIN_TAB)))) |