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CREATE TABLE t1(f1 INT, f2 INT AS (f1 + 2) VIRTUAL)ENGINE=InnoDB;
INSERT INTO t1(f1) VALUES(1), (1);
ALTER TABLE t1 ADD UNIQUE INDEX(f2), ALGORITHM=INPLACE, LOCK=EXCLUSIVE;
ERROR 23000: Duplicate entry '3' for key 'f2'
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`f1` int(11) DEFAULT NULL,
`f2` int(11) GENERATED ALWAYS AS (`f1` + 2) VIRTUAL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
DROP TABLE t1;
CREATE TABLE t1(f1 INT, f2 INT AS (f1) VIRTUAL)ENGINE=InnoDB;
SET DEBUG_DBUG="+d,create_index_fail";
SET DEBUG_SYNC="innodb_inplace_alter_table_enter SIGNAL con1_go WAIT_FOR alter_signal";
ALTER TABLE t1 ADD INDEX(f2);
connect con1,localhost,root,,,;
SET DEBUG_SYNC="now WAIT_FOR con1_go";
BEGIN;
INSERT INTO t1(f1) VALUES(1);
SET DEBUG_SYNC="now SIGNAL alter_signal";
connection default;
ERROR 23000: Duplicate entry '' for key '*UNKNOWN*'
connection con1;
rollback;
connection default;
disconnect con1;
DROP TABLE t1;
SET DEBUG_SYNC=RESET;
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