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--source include/have_innodb.inc --source include/have_debug.inc create table t1 ( rowid int, f1 int, f2 int, key i1 (f1, f2), key i2 (f2)) engine=innodb; show create table t1; insert into `t1` (rowid, f1, f2) values (1, 1, 10), (2, 1, NULL); connect (a,localhost,root,,); connect (b,localhost,root,,); connection a; start transaction with consistent snapshot; connection b; start transaction; update t1 set f2 = 4 where f1 = 1 and f2 is null; -- echo (b) Number of rows updated: select row_count(); insert into t1 values (3, 1, null); -- echo (b) After update and insert query. select rowid, f1, f2 from t1; commit; connection a; -- echo (a) Before the update statement is executed. select rowid, f1, f2 from t1; SET SESSION debug="+d,bug14007649"; update t1 set f2 = 6 where f1 = 1 and f2 is null; -- echo (a) Number of rows updated: select row_count(); -- echo (a) After the update statement is executed. select rowid, f1, f2 from t1; commit; --echo "The trx with consistent snapshot ended." select rowid, f1, f2 from t1; connection default; disconnect a; disconnect b; drop table t1;