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MDEV-19092 Server crash when renaming the column when

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FOREIGN_KEY_CHECKS is disabled

- dict_foreign_find_index() can return NULL if InnoDB already dropped
the foreign index when FOREIGN_KEY_CHECKS is disabled.
This commit is contained in:
Thirunarayanan Balathandayuthapani 2020-03-25 17:10:01 +05:30
commit 1f7be88141
4 changed files with 26 additions and 6 deletions
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7
mysql-test/suite/innodb/r/foreign_key.result
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@ -113,3 +113,10 @@ CREATE TABLE t2 (f INT, KEY(f)) ENGINE=InnoDB;
ALTER TABLE t1 ADD FOREIGN KEY (f2) REFERENCES t2 (f);
ALTER IGNORE TABLE t1 ADD FOREIGN KEY (f3) REFERENCES t1 (f1);
DROP TABLE t1, t2;
CREATE TABLE t1 (a INT, b INT, KEY idx(a)) ENGINE=InnoDB;
SET FOREIGN_KEY_CHECKS= OFF;
ALTER TABLE t1 ADD FOREIGN KEY (a) REFERENCES tx(x);
ALTER TABLE t1 DROP KEY idx;
ALTER TABLE t1 CHANGE a c INT;
DROP TABLE t1;
SET FOREIGN_KEY_CHECKS=1;