Prepared for push (BUG#42567)

mysql-test/r/group_by.result

@@ -1691,3 +1691,15 @@ FROM t1;
 ERROR 21000: Subquery returns more than 1 row
 DROP TABLE t1;
 SET @@sql_mode = @old_sql_mode;
+SET @old_sql_mode = @@sql_mode;
+SET @@sql_mode='ONLY_FULL_GROUP_BY';
+CREATE TABLE t1(i INT);
+INSERT INTO t1 VALUES (1), (10);
+SELECT COUNT(i) FROM t1;
+COUNT(i)
+2
+SELECT COUNT(i) FROM t1 WHERE i > 1;
+COUNT(i)
+1
+DROP TABLE t1;
+SET @@sql_mode = @old_sql_mode;

mysql-test/t/func_group.test

@@ -18,6 +18,8 @@ insert into t1 values (3,5,"C");
 insert into t1 values (3,6,"D");
 
 # Test of MySQL field extension with and without matching records.
+#### Note: The two following statements may fail if the execution plan
+#### or optimizer is changed. The result for column c is undefined.
 select a,c,sum(a) from t1 group by a;
 select a,c,sum(a) from t1 where a > 10 group by a;
 select sum(a) from t1 where a > 10;

mysql-test/t/group_by.test

@@ -1139,4 +1139,22 @@ DROP TABLE t1;
 SET @@sql_mode = @old_sql_mode;
 
 
+#
+# Bug#42567 Invalid GROUP BY error
+#
+
+# Setup of the subtest
+SET @old_sql_mode = @@sql_mode;
+SET @@sql_mode='ONLY_FULL_GROUP_BY';
+
+CREATE TABLE t1(i INT);
+INSERT INTO t1 VALUES (1), (10);
+
+# The actual test
+SELECT COUNT(i) FROM t1;
+SELECT COUNT(i) FROM t1 WHERE i > 1;
+
+# Cleanup of subtest
+DROP TABLE t1;
+SET @@sql_mode = @old_sql_mode;