diff --git a/mysql-test/r/ctype_ucs.result b/mysql-test/r/ctype_ucs.result
index f060c3c9bf6..890cdfd5cfc 100644
--- a/mysql-test/r/ctype_ucs.result
+++ b/mysql-test/r/ctype_ucs.result
@@ -704,6 +704,32 @@ select f1 from t1 where f1 like 'a%';
 f1
 a
 drop table t1;
+create table t1 (utext varchar(20) character set ucs2);
+insert into t1 values ("lily");
+insert into t1 values ("river");
+prepare stmt from 'select utext from t1 where utext like ?';
+set @param1='%%';
+execute stmt using @param1;
+utext
+lily
+river
+execute stmt using @param1;
+utext
+lily
+river
+select utext from t1 where utext like '%%';
+utext
+lily
+river
+drop table t1;
+deallocate prepare stmt;
+CREATE TABLE t1 (id int, s char(5) CHARACTER SET ucs2 COLLATE ucs2_unicode_ci);
+INSERT INTO t1 VALUES (1, 'ZZZZZ'), (1, 'ZZZ'), (2, 'ZZZ'), (2, 'ZZZZZ');
+SELECT id, MIN(s) FROM t1 GROUP BY id;
+id	MIN(s)
+1	ZZZ
+2	ZZZ
+DROP TABLE t1;
 CREATE TABLE t1 (a varchar(64) character set ucs2, b decimal(10,3));
 INSERT INTO t1 VALUES ("1.1", 0), ("2.1", 0);
 update t1 set b=a;
diff --git a/mysql-test/t/ctype_ucs.test b/mysql-test/t/ctype_ucs.test
index c7662f4f85a..eea0b06b224 100644
--- a/mysql-test/t/ctype_ucs.test
+++ b/mysql-test/t/ctype_ucs.test
@@ -439,6 +439,32 @@ insert into t1 values('a');
 create index t1f1 on t1(f1);
 select f1 from t1 where f1 like 'a%';
 drop table t1;
+
+#
+# Bug#9442 Set parameter make query fail if column character set is UCS2
+#
+create table t1 (utext varchar(20) character set ucs2);
+insert into t1 values ("lily");
+insert into t1 values ("river");
+prepare stmt from 'select utext from t1 where utext like ?';
+set @param1='%%';
+execute stmt using @param1;
+execute stmt using @param1;
+select utext from t1 where utext like '%%';
+drop table t1;
+deallocate prepare stmt;
+
+#
+# Bug #20076: server crashes for a query with GROUP BY if MIN/MAX aggregation
+#             over a 'ucs2' field uses a temporary table 
+#
+
+CREATE TABLE t1 (id int, s char(5) CHARACTER SET ucs2 COLLATE ucs2_unicode_ci);
+INSERT INTO t1 VALUES (1, 'ZZZZZ'), (1, 'ZZZ'), (2, 'ZZZ'), (2, 'ZZZZZ');
+
+SELECT id, MIN(s) FROM t1 GROUP BY id;
+
+DROP TABLE t1;
 # End of 4.1 tests
 
 #
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 962454e237e..877eb908d27 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -2102,7 +2102,6 @@ Item_sum_hybrid::min_max_update_str_field()
 
   if (!args[0]->null_value)
   {
-    res_str->strip_sp();
     result_field->val_str(&tmp_value);
 
     if (result_field->is_null() ||