Test case for bug #666

mysql-test/r/func_str.result:
  test for bug #666 result
mysql-test/t/func_str.test:
  test for bug #666

mysql-test/r/func_str.result

@@ -234,3 +234,16 @@ INSERT INTO t1 VALUES (1, 'a545f661efdd1fb66fdee3aab79945bf');
 SELECT 1 FROM t1 WHERE tmp=AES_DECRYPT(tmp,"password");
 1
 DROP TABLE t1;
+CREATE TABLE t1 (
+wid int(10) unsigned NOT NULL auto_increment,
+data_podp date default NULL,
+status_wnio enum('nowy','podp','real','arch') NOT NULL default 'nowy',
+PRIMARY KEY(wid),
+);
+INSERT INTO t1 VALUES (8,NULL,'real');
+INSERT INTO t1 VALUES (9,NULL,'nowy');
+SELECT elt(status_wnio,data_podp) FROM t1 GROUP BY wid;
+elt(status_wnio,data_podp)
+NULL
+NULL
+DROP TABLE t1;

mysql-test/t/func_str.test

@@ -125,3 +125,15 @@ CREATE TABLE t1 (id int(11) NOT NULL auto_increment, tmp text NOT NULL, KEY id (
 INSERT INTO t1 VALUES (1, 'a545f661efdd1fb66fdee3aab79945bf');
 SELECT 1 FROM t1 WHERE tmp=AES_DECRYPT(tmp,"password");
 DROP TABLE t1;
+
+CREATE TABLE t1 (
+  wid int(10) unsigned NOT NULL auto_increment,
+  data_podp date default NULL,
+  status_wnio enum('nowy','podp','real','arch') NOT NULL default 'nowy',
+  PRIMARY KEY(wid),
+);
+
+INSERT INTO t1 VALUES (8,NULL,'real');
+INSERT INTO t1 VALUES (9,NULL,'nowy');
+SELECT elt(status_wnio,data_podp) FROM t1 GROUP BY wid;
+DROP TABLE t1;