ALTER TABLE {ADD|DROP} INDEX IF [NOT] EXISTS does not get written into binlog if nothing to do

CREATE TABLE t1(a INT, b INT);

CREATE TABLE IF NOT EXISTS t1(a INT, b INT);

CREATE INDEX IF NOT EXISTS i1 ON t1(a);

CREATE INDEX IF NOT EXISTS i1 ON t1(a);

SHOW CREATE TABLE t1;

DROP INDEX IF EXISTS i1 ON t1;

DROP INDEX IF EXISTS i1 ON t1;

DROP TABLE t1;

DROP TABLE IF EXISTS t1;

--replace_column 1 # 2 # 5 #

--replace_regex /xid=[0-9]+/xid=XX/ /GTID [0-9]+-[0-9]+-[0-9]+/GTID #-#-#/ /Server.ver.*/VER/

SHOW BINLOG EVENTS;

RESET MASTER;

+SHOW BINLOG EVENTS;

+Log_name	Pos	Event_type	Server_id	End_log_pos	Info

+#	#	Format_desc	1	#	VER

+#	#	Gtid_list	1	#	[]

+#	#	Binlog_checkpoint	1	#	master-bin.000001

+#	#	Gtid	1	#	GTID #-#-#

+#	#	Query	1	#	use `test`; CREATE TABLE t1(a INT, b INT)

+#	#	Gtid	1	#	GTID #-#-#

+#	#	Query	1	#	use `test`; CREATE TABLE IF NOT EXISTS t1(a INT, b INT)

+#	#	Gtid	1	#	GTID #-#-#

+#	#	Query	1	#	use `test`; CREATE INDEX IF NOT EXISTS i1 ON t1(a)

+#	#	Gtid	1	#	GTID #-#-#

+#	#	Query	1	#	use `test`; DROP INDEX IF EXISTS i1 ON t1

+#	#	Gtid	1	#	GTID #-#-#

+#	#	Query	1	#	use `test`; DROP TABLE `t1` /* generated by server */

+#	#	Gtid	1	#	GTID #-#-#

+#	#	Query	1	#	use `test`; DROP TABLE IF EXISTS `t1` /* generated by server */

+RESET MASTER;