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create table t1 ( rowid int, f1 int, f2 int, key i1 (f1, f2), key i2 (f2)) engine=innodb; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `rowid` int(11) DEFAULT NULL, `f1` int(11) DEFAULT NULL, `f2` int(11) DEFAULT NULL, KEY `i1` (`f1`,`f2`), KEY `i2` (`f2`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 insert into `t1` (rowid, f1, f2) values (1, 1, 10), (2, 1, NULL); start transaction with consistent snapshot; start transaction; update t1 set f2 = 4 where f1 = 1 and f2 is null; (b) Number of rows updated: select row_count(); row_count() 1 insert into t1 values (3, 1, null); (b) After update and insert query. select rowid, f1, f2 from t1; rowid f1 f2 1 1 10 2 1 4 3 1 NULL commit; (a) Before the update statement is executed. select rowid, f1, f2 from t1; rowid f1 f2 1 1 10 2 1 NULL SET SESSION debug="+d,bug14007649"; update t1 set f2 = 6 where f1 = 1 and f2 is null; (a) Number of rows updated: select row_count(); row_count() 1 (a) After the update statement is executed. select rowid, f1, f2 from t1; rowid f1 f2 1 1 10 2 1 NULL 3 1 6 commit; "The trx with consistent snapshot ended." select rowid, f1, f2 from t1; rowid f1 f2 1 1 10 2 1 4 3 1 6 drop table t1;