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MDEV-17362: SIGSEGV in JOIN::optimize_inner or Assertion `fixed == 0' failed in Item_equal::fix_fields, server crashes after 2nd execution of PS

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Move reinitialisation of pushdown variables for every query, because it used now not only for derived tables.
This commit is contained in:
Oleksandr Byelkin
2019-04-02 15:04:45 +02:00
parent 6c306a729d
commit eb056f8726
5 changed files with 73 additions and 7 deletions
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33
mysql-test/main/subselect_innodb.result
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@ -616,3 +616,36 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
Warnings:
Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t2`.`f2` AS `f2`,`test`.`t3`.`f3` AS `f3` from `test`.`t1` join `test`.`t2` semi join (`test`.`t4`) join `test`.`t3` where `test`.`t4`.`f4` = 1 and `test`.`t1`.`f1` >= `test`.`t2`.`f2`
DROP TABLE t1,t2,t3,t4;
#
# MDEV-17362: SIGSEGV in JOIN::optimize_inner or Assertion `fixed == 0'
# failed in Item_equal::fix_fields, server crashes after 2nd execution
# of PS
#
create table t1 (a int, b int);
create table t2 (x int, y int);
insert into t1 values (1,1),(2,2);
insert into t2 values (1,1),(2,2),(2,3);
# here we can see conditions pushdown (see HAVING):
prepare stmt from "
explain extended
SELECT * FROM t1
WHERE a = b
AND (a,b) IN (SELECT t2.x, COUNT(t2.y) FROM t2 WHERE 1=2 GROUP BY t2.x);";
execute stmt;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from <materialize> (/* select#2 */ select `test`.`t2`.`x`,count(`test`.`t2`.`y`) from `test`.`t2` where 0 group by `test`.`t2`.`x` having `COUNT(t2.y)` = `test`.`t2`.`x`) join `test`.`t1` where 0
# here re-execution of the pushdown does not crash:
prepare stmt from "
SELECT * FROM t1
WHERE a = b
AND (a,b) IN (SELECT t2.x, COUNT(t2.y) FROM t2 WHERE 1=2 GROUP BY t2.x);";
execute stmt;
a b
execute stmt;
a b
execute stmt;
a b
drop table t1,t2;