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MDEV-24346 valgrind error in main.precedence

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in queries like

  create view v1 as select 2 like 1 escape (3 in (select 0 union select 1));
  select 2 union select * from v1;

Item_func_like::escape was left uninitialized, because
Item_in_optimizer is const_during_execution()
but not actually const_item() during execution.

It's not, because const subquery evaluation was disabled for derived.
Practically it only needs to be disabled for multi-update
that runs fix_fields() before all tables are locked.
This commit is contained in:
Sergei Golubchik
2020-12-14 18:25:08 +01:00
parent 5785de72ac
commit a587ded283
5 changed files with 14 additions and 3 deletions
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mysql-test/suite/innodb/r/innodb_multi_update.result
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@ -81,4 +81,5 @@ CREATE TABLE t1(f1 INT) ENGINE=INNODB;
INSERT INTO t1 VALUES(1);
UPDATE (SELECT ((SELECT 1 FROM t1), 1) FROM t1 WHERE (SELECT 1 FROM t1)) x, (SELECT 1) AS d SET d.f1 = 1;
ERROR 21000: Operand should contain 1 column(s)
UPDATE (SELECT ((SELECT 1 FROM t1),1) = (1,1) FROM t1 WHERE (SELECT 1 FROM t1)) x, t1 AS d SET d.f1 = 1;
DROP TABLE t1;