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# # Bug#22469130: FOREIGN KEY ON DELETE CASCADE NOT ALLOWED # WHEN A VIRTUAL INDEX EXISTS. # Add the VIRTUAL INDEX contains fk constraINT column # using INPLACE alter operatiON CREATE TABLE t1(fld1 INT NOT NULL PRIMARY KEY); CREATE TABLE t2(fld1 INT NOT NULL, fld2 INT NOT NULL, fld3 INT AS (fld2) VIRTUAL, KEY(fld1), FOREIGN KEY(fld1) REFERENCES t1(fld1) ON UPDATE CASCADE); INSERT INTO t1(fld1) VALUES(1); INSERT INTO t2(fld1, fld2) VALUES(1, 2); # restart UPDATE t1 SET fld1= 2; SELECT fld3, fld1 FROM t2; fld3 fld1 2 2 alter TABLE t2 ADD INDEX vk(fld3, fld1), ALGORITHM=INPLACE; UPDATE t1 SET fld1=3; SELECT fld3, fld1 FROM t2; fld3 fld1 2 3 EXPLAIN SELECT fld3, fld1 FROM t2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra x x t2 x index x vk x x x x x DROP TABLE t2, t1; # TEMPORARY TABLE NAME and CHILD TABLE NAME are same CREATE TABLE t1(fld1 INT NOT NULL PRIMARY KEY); CREATE TABLE t2(fld1 INT NOT NULL, fld2 INT AS (fld1) VIRTUAL, KEY(fld2), FOREIGN KEY(fld1) REFERENCES t1(fld1) ON UPDATE CASCADE); INSERT INTO t1 VALUES(1), (2); INSERT INTO t2 VALUES(1, DEFAULT), (2, default); # restart CREATE TEMPORARY TABLE t2 (fld1 INT NOT NULL)ENGINE=INNODB; UPDATE t1 SET fld1= 3 WHERE fld1= 2; SELECT fld2 FROM t2; fld2 1 3 EXPLAIN SELECT fld2 FROM t2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra x x t2 x index x fld2 x x x x x CHECK TABLE t2; Table Op Msg_type Msg_text test.t2 check status OK DROP TABLE t2; DROP TABLE t2, t1;