user_var.result, user_var.test:

  Extended test case for the bug#28494.

mysql-test/r/user_var.result

@@ -317,8 +317,11 @@ SHOW COUNT(*) WARNINGS;
 SHOW COUNT(*) ERRORS;
 @@session.error_count
 1
-create table t1(f1 int);
-insert into t1 values(1),(1),(2),(3),(4),(1),(3),(1);
+create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
+insert into t1 values 
+(1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
+(3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
+(3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
 select @a:=f1, count(f1) from t1 group by 1 desc;
 @a:=f1	count(f1)
 4	1
@@ -331,4 +334,22 @@ select @a:=f1, count(f1) from t1 group by 1 asc;
 2	1
 3	2
 4	1
+select @a:=f2, count(f2) from t1 group by 1 desc;
+@a:=f2	count(f2)
+a	4
+b	1
+c	2
+d	1
+select @a:=f3, count(f3) from t1 group by 1 desc;
+@a:=f3	count(f3)
+1.5	4
+2.5	1
+3.5	2
+4.5	1
+select @a:=f4, count(f4) from t1 group by 1 desc;
+@a:=f4	count(f4)
+4.6	1
+3.6	2
+2.6	1
+1.6	4
 drop table t1;

mysql-test/t/user_var.test

@@ -226,8 +226,14 @@ SHOW COUNT(*) ERRORS;
 #
 # Bug#28494: Grouping by Item_func_set_user_var produces incorrect result.
 #
-create table t1(f1 int);
-insert into t1 values(1),(1),(2),(3),(4),(1),(3),(1);
+create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
+insert into t1 values 
+  (1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
+  (3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
+  (3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
 select @a:=f1, count(f1) from t1 group by 1 desc;
 select @a:=f1, count(f1) from t1 group by 1 asc;
+select @a:=f2, count(f2) from t1 group by 1 desc;
+select @a:=f3, count(f3) from t1 group by 1 desc;
+select @a:=f4, count(f4) from t1 group by 1 desc;
 drop table t1;