Manually merged

mysql-test/r/select.result

@@ -2400,6 +2400,14 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
 1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	
 DROP TABLE t1, t2;
+create table t1 (f1 int primary key, f2 int);
+create table t2 (f3 int, f4 int, primary key(f3,f4));
+insert into t1 values (1,1);
+insert into t2 values (1,1),(1,2);
+select distinct count(f2) >0 from t1 left join t2 on f1=f3 group by f1;
+count(f2) >0
+1
+drop table t1,t2;
 CREATE TABLE t1 ( city char(30) );
 INSERT INTO t1 VALUES ('London');
 INSERT INTO t1 VALUES ('Paris');

mysql-test/t/select.test

@@ -2228,4 +2228,13 @@ SELECT t2.a, t2.b, IF(t1.b IS NULL,'',c) AS c, COUNT(*) AS d FROM t2,t1
 WHERE t2.a = t1.a AND t2.b = t1.b GROUP BY a, b, c;
 DROP TABLE IF EXISTS t1, t2;
 
+#
+# Bug #13855 select distinct with group by caused server crash
+#
+create table t1 (f1 int primary key, f2 int);
+create table t2 (f3 int, f4 int, primary key(f3,f4));
+insert into t1 values (1,1);
+insert into t2 values (1,1),(1,2);
+select distinct count(f2) >0 from t1 left join t2 on f1=f3 group by f1;
+drop table t1,t2;
 # End of 4.1 tests

netware/mysql_test_run.c

@@ -172,7 +172,7 @@ void report_stats()
     log_msg("\nFailed %u/%u test(s), %.02f%% successful.\n",
       total_fail, total_test, percent);
 		log_msg("\nThe .out and .err files in %s may give you some\n", result_dir);
-		log_msg("hint of what when wrong.\n");
+		log_msg("hint of what went wrong.\n");
 		log_msg("\nIf you want to report this error, please first read the documentation\n");
 		log_msg("at: http://www.mysql.com/doc/en/MySQL_test_suite.html\n");
   }

sql/sql_select.cc

@@ -689,6 +689,7 @@ JOIN::optimize()
   {
     order=0;					// The output has only one row
     simple_order=1;
+    select_distinct= 0;                       // No need in distinct for 1 row
   }
 
   calc_group_buffer(this, group_list);