diff --git a/mysql-test/r/trigger.result b/mysql-test/r/trigger.result
index 681b805f547..a5cec65b454 100644
--- a/mysql-test/r/trigger.result
+++ b/mysql-test/r/trigger.result
@@ -949,9 +949,42 @@ insert into t1 values
 create function f2() returns int return (select max(b) from t2);
 insert into t2 select a, f2() from t1;
 load data infile '../std_data_ln/words.dat' into table t1 (a) set b:= f1();
-drop table t1;
+drop tables t1, t2;
 drop function f1;
 drop function f2;
+create table t1(i int not null, j int not null, n numeric(15,2), primary key(i,j));
+create table t2(i int not null, n numeric(15,2), primary key(i));
+create trigger t1_ai after insert on t1 for each row
+begin
+declare sn numeric(15,2);
+select sum(n) into sn from t1 where i=new.i;
+replace into t2 values(new.i, sn);
+end|
+insert into t1 values
+(1,1,10.00),(1,2,10.00),(1,3,10.00),(1,4,10.00),(1,5,10.00),
+(1,6,10.00),(1,7,10.00),(1,8,10.00),(1,9,10.00),(1,10,10.00),
+(1,11,10.00),(1,12,10.00),(1,13,10.00),(1,14,10.00),(1,15,10.00);
+select * from t1;
+i	j	n
+1	1	10.00
+1	2	10.00
+1	3	10.00
+1	4	10.00
+1	5	10.00
+1	6	10.00
+1	7	10.00
+1	8	10.00
+1	9	10.00
+1	10	10.00
+1	11	10.00
+1	12	10.00
+1	13	10.00
+1	14	10.00
+1	15	10.00
+select * from t2;
+i	n
+1	150.00
+drop tables t1, t2;
 DROP TABLE IF EXISTS t1;
 CREATE TABLE t1 (
 conn_id INT,
diff --git a/mysql-test/t/trigger.test b/mysql-test/t/trigger.test
index a0b67b2204d..ae05d70bf67 100644
--- a/mysql-test/t/trigger.test
+++ b/mysql-test/t/trigger.test
@@ -1111,10 +1111,34 @@ insert into t1 values
 create function f2() returns int return (select max(b) from t2);
 insert into t2 select a, f2() from t1;
 load data infile '../std_data_ln/words.dat' into table t1 (a) set b:= f1();
-drop table t1;
+drop tables t1, t2;
 drop function f1;
 drop function f2;
 
+#
+# Test for bug #16021 "Wrong index given to function in trigger" which
+# was caused by the same bulk insert optimization as bug #17764 but had
+# slightly different symptoms (instead of reporting table as crashed
+# storage engine reported error number 124)
+#
+create table t1(i int not null, j int not null, n numeric(15,2), primary key(i,j));
+create table t2(i int not null, n numeric(15,2), primary key(i));
+delimiter |;
+create trigger t1_ai after insert on t1 for each row
+begin
+  declare sn numeric(15,2);
+  select sum(n) into sn from t1 where i=new.i;
+  replace into t2 values(new.i, sn);
+end|
+delimiter ;|
+insert into t1 values
+  (1,1,10.00),(1,2,10.00),(1,3,10.00),(1,4,10.00),(1,5,10.00),
+  (1,6,10.00),(1,7,10.00),(1,8,10.00),(1,9,10.00),(1,10,10.00),
+  (1,11,10.00),(1,12,10.00),(1,13,10.00),(1,14,10.00),(1,15,10.00);
+select * from t1;
+select * from t2;
+drop tables t1, t2;
+
 #
 # Test for Bug #16461 connection_id() does not work properly inside trigger
 #