diff --git a/mysql-test/r/ctype_utf8.result b/mysql-test/r/ctype_utf8.result
index 934f56877ac..9416963a9cc 100644
--- a/mysql-test/r/ctype_utf8.result
+++ b/mysql-test/r/ctype_utf8.result
@@ -1281,6 +1281,22 @@ id	tid	val
 42749	72	VOLNÝ ADSL
 44205	72	VOLNÝ ADSL
 DROP TABLE t1;
+create table t1(a char(200) collate utf8_unicode_ci NOT NULL default '')
+default charset=utf8 collate=utf8_unicode_ci;
+insert into t1 values (unhex('65')), (unhex('C3A9')), (unhex('65'));
+explain select distinct a from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using temporary
+select distinct a from t1;
+a
+e
+explain select a from t1 group by a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
+select a from t1 group by a;
+a
+e
+drop table t1;
 CREATE TABLE t1(id varchar(20) NOT NULL) DEFAULT CHARSET=utf8;
 INSERT INTO t1 VALUES ('xxx'), ('aa'), ('yyy'), ('aa');
 SELECT id FROM t1;
diff --git a/mysql-test/t/ctype_utf8.test b/mysql-test/t/ctype_utf8.test
index 77b76a14171..eb5778aafa7 100644
--- a/mysql-test/t/ctype_utf8.test
+++ b/mysql-test/t/ctype_utf8.test
@@ -1026,6 +1026,20 @@ ALTER TABLE t1 ADD KEY idx (tid,val(11));
 SELECT * FROM t1 WHERE tid=72 and val LIKE 'VOLNÝ ADSL'; 
 
 DROP TABLE t1;
+
+#
+# Bug 20709: problem with utf8 fields in temporary tables
+#
+
+create table t1(a char(200) collate utf8_unicode_ci NOT NULL default '')
+  default charset=utf8 collate=utf8_unicode_ci;
+insert into t1 values (unhex('65')), (unhex('C3A9')), (unhex('65'));
+explain select distinct a from t1;
+select distinct a from t1;
+explain select a from t1 group by a;
+select a from t1 group by a;
+drop table t1;
+
 # End of 4.1 tests
 
 #