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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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32
mysql-test/main/subselect_innodb.test
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@ -611,3 +611,35 @@ FROM t1
DROP TABLE t1,t2,t3,t4;
--echo #
--echo # MDEV-17362: SIGSEGV in JOIN::optimize_inner or Assertion `fixed == 0'
--echo # failed in Item_equal::fix_fields, server crashes after 2nd execution
--echo # of PS
--echo #
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);
--echo # 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;
--echo # 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;
execute stmt;
execute stmt;
drop table t1,t2;