database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

MDEV-30539 EXPLAIN EXTENDED: no message with queries for DML statements

Browse Source 
EXPLAIN EXTENDED for an UPDATE/DELETE/INSERT/REPLACE statement did not
produce the warning containing the text representation of the query
obtained after the optimization phase. Such warning was produced for
SELECT statements, but not for DML statements.
The patch fixes this defect of EXPLAIN EXTENDED for DML statements.
This commit is contained in:
Igor Babaev
2023-03-22 21:59:18 -07:00
parent 011261f4e9
commit f33fc2fae5
18 changed files with 565 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
mysql-test/main/ps.result
View File

@ -5566,11 +5566,15 @@ EXPLAIN EXTENDED UPDATE t3 SET c3 = ( SELECT COUNT(d1.c1) FROM ( SELECT a11.c1 F
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 0 100.00
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 /* select#1 */ update `test`.`t3` set `test`.`t3`.`c3` = (/* select#2 */ select count(NULL) from `test`.`t1` `a11` straight_join `test`.`t2` `a21` join `test`.`t1` `a12` where 0)
PREPARE stmt FROM "EXPLAIN EXTENDED UPDATE t3 SET c3 = ( SELECT COUNT(d1.c1) FROM ( SELECT a11.c1 FROM t1 AS a11 STRAIGHT_JOIN t2 AS a21 ON a21.c2 = a11.c1 JOIN t1 AS a12 ON a12.c1 = a11.c1 ) d1 )";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 0 100.00
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 /* select#1 */ update `test`.`t3` set `test`.`t3`.`c3` = (/* select#2 */ select count(NULL) from `test`.`t1` `a11` straight_join `test`.`t2` `a21` join `test`.`t1` `a12` where 0)
DEALLOCATE PREPARE stmt;
DROP TABLE t1, t2, t3;
#