database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-12-24 11:21:21 +03:00
Code Activity

MDEV-238: SHOW EXPLAIN: Server crashes in JOIN::print_explain with FROM subquery and GROUP BY

Browse Source 
- Support SHOW EXPLAIN for selects that have "Using temporary; Using filesort".
This commit is contained in:
Sergey Petrunya
2012-05-10 13:43:48 +04:00
parent cdc9a1172d
commit 58b9164f04
6 changed files with 106 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
sql/sql_select.h
View File

@@ -896,6 +896,20 @@ protected:
public:
JOIN_TAB *join_tab, **best_ref;
/*
For "Using temporary+Using filesort" queries, JOIN::join_tab can point to
either:
1. array of join tabs describing how to run the select, or
2. array of single join tab describing read from the temporary table.
SHOW EXPLAIN code needs to read/show #1. This is why two next members are
there for saving it.
*/
JOIN_TAB *table_access_tabs;
uint top_table_access_tabs_count;
JOIN_TAB **map2table; ///< mapping between table indexes and JOIN_TABs
JOIN_TAB *join_tab_save; ///< saved join_tab for subquery reexecution