BUG#15961: SUBPARTITION defined in non-subpartitioned table no error

Made sure that no subpartition stuff in non-subpartitioned table

mysql-test/r/partition.result

@@ -428,4 +428,8 @@ partition by list (a)
 alter table t1 rebuild partition;
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
 drop table t1;
+create table t1 (a int)
+partition by hash (a)
+(partition p0 (subpartition sp0));
+ERROR HY000: It is only possible to mix RANGE/LIST partitioning with HASH/KEY partitioning for subpartitioning
 End of 5.1 tests

mysql-test/r/partition_mgm_err.result

@@ -141,7 +141,9 @@ DROP TABLE t1;
 CREATE TABLE t1 (a INT) PARTITION BY HASH(a);
 ALTER TABLE t1 ADD PARTITION PARTITIONS 4;
 DROP TABLE t1;
-CREATE TABLE t1 (s1 int, s2 int) PARTITION BY LIST (s1)  (
+CREATE TABLE t1 (s1 int, s2 int)
+PARTITION BY LIST (s1) 
+SUBPARTITION BY KEY (s2) (
 PARTITION p1 VALUES IN (0) (SUBPARTITION p1b), 
 PARTITION p2 VALUES IN (2) (SUBPARTITION p1b)
 );

mysql-test/t/partition.test

@@ -552,4 +552,13 @@ alter table t1 rebuild partition;
 
 drop table t1;
 
+#
+# BUG 15961 No error when subpartition defined without subpartition by clause
+#
+--error ER_SUBPARTITION_ERROR
+create table t1 (a int)
+partition by hash (a)
+(partition p0 (subpartition sp0));
+
+
 --echo End of 5.1 tests

mysql-test/t/partition_mgm_err.test

@@ -205,7 +205,9 @@ DROP TABLE t1;
 #BUG 15408: Partitions: subpartition names are not unique
 #
 --error ER_SAME_NAME_PARTITION
-CREATE TABLE t1 (s1 int, s2 int) PARTITION BY LIST (s1)  (
+CREATE TABLE t1 (s1 int, s2 int)
+PARTITION BY LIST (s1) 
+SUBPARTITION BY KEY (s2) (
 PARTITION p1 VALUES IN (0) (SUBPARTITION p1b), 
 PARTITION p2 VALUES IN (2) (SUBPARTITION p1b)
 );

sql/sql_partition.cc

@@ -692,6 +692,13 @@ bool check_partition_info(partition_info *part_info,handlerton **eng_type,
   char *same_name;
   DBUG_ENTER("check_partition_info");
 
+  if (unlikely(!part_info->is_sub_partitioned() &&
+               !(part_info->use_default_subpartitions &&
+                 part_info->use_default_no_subpartitions)))
+  {
+    my_error(ER_SUBPARTITION_ERROR, MYF(0));
+    goto end;
+  }
   if (unlikely(part_info->is_sub_partitioned() &&
               (!(part_info->part_type == RANGE_PARTITION ||
                  part_info->part_type == LIST_PARTITION))))