BUG#20161: LINEAR keyword on subpartitions not displayed in information schema for partitions

and in SHOW CREATE TABLE

mysql-test/r/information_schema_part.result

@@ -111,3 +111,32 @@ NULL	test	t1	p0	NULL	1	NULL	LINEAR HASH	NULL	month(f1)	NULL	NULL	0	0	0	#	1024	0
 NULL	test	t1	p1	NULL	2	NULL	LINEAR HASH	NULL	month(f1)	NULL	NULL	0	0	0	#	1024	0	#	#	NULL	NULL	default	0	default
 NULL	test	t1	p2	NULL	3	NULL	LINEAR HASH	NULL	month(f1)	NULL	NULL	0	0	0	#	1024	0	#	#	NULL	NULL	default	0	default
 drop table t1;
+create table t1 (a int)
+PARTITION BY RANGE (a)
+SUBPARTITION BY LINEAR HASH (a)
+(PARTITION p0 VALUES LESS THAN (10));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 PARTITION BY RANGE (a) SUBPARTITION BY LINEAR HASH (a) (PARTITION p0 VALUES LESS THAN (10) )
+select SUBPARTITION_METHOD FROM information_schema.partitions WHERE
+table_schema="test" AND table_name="t1";
+SUBPARTITION_METHOD
+LINEAR HASH
+drop table t1;
+create table t1 (a int)
+PARTITION BY LIST (a)
+(PARTITION p0 VALUES IN
+(10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
+32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 PARTITION BY LIST (a) (PARTITION p0 VALUES IN (10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53) ENGINE = MyISAM)
+SELECT PARTITION_DESCRIPTION FROM information_schema.partitions WHERE
+table_schema = "test" AND table_name = "t1";
+PARTITION_DESCRIPTION
+10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53
+drop table t1;

mysql-test/t/information_schema_part.test

@@ -99,3 +99,25 @@ select * from information_schema.partitions where table_schema="test"
 and table_name="t1";
 drop table t1;
 
+#
+# Bug 20161 Partitions: SUBPARTITION METHOD doesn't show LINEAR keyword
+#
+create table t1 (a int)
+PARTITION BY RANGE (a)
+SUBPARTITION BY LINEAR HASH (a)
+(PARTITION p0 VALUES LESS THAN (10));
+
+SHOW CREATE TABLE t1;
+select SUBPARTITION_METHOD FROM information_schema.partitions WHERE
+table_schema="test" AND table_name="t1";
+drop table t1;
+
+create table t1 (a int)
+PARTITION BY LIST (a)
+(PARTITION p0 VALUES IN
+(10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
+ 32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53));
+SHOW CREATE TABLE t1;
+SELECT PARTITION_DESCRIPTION FROM information_schema.partitions WHERE
+table_schema = "test" AND table_name = "t1";
+drop table t1;

sql/sql_partition.cc

@@ -1843,6 +1843,8 @@ char *generate_partition_syntax(partition_info *part_info,
   {
     err+= add_subpartition_by(fptr);
     /* Must be hash partitioning for subpartitioning */
+    if (part_info->linear_hash_ind)
+      err+= add_string(fptr, partition_keywords[PKW_LINEAR].str);
     if (part_info->list_of_subpart_fields)
       err+= add_key_partition(fptr, part_info->subpart_field_list);
     else

sql/sql_show.cc

@@ -3911,24 +3911,28 @@ static int get_schema_partitions_record(THD *thd, struct st_table_list *tables,
     {
       table->field[9]->store(part_info->part_func_string,
                              part_info->part_func_len, cs);
-      table->field[9]->set_notnull();
     }
     else if (part_info->list_of_part_fields)
     {
       collect_partition_expr(part_info->part_field_list, &tmp_str);
       table->field[9]->store(tmp_str.ptr(), tmp_str.length(), cs);
-      table->field[9]->set_notnull();
     }
+    table->field[9]->set_notnull();
 
     if (part_info->is_sub_partitioned())
     {
       /* Subpartition method */
+      tmp_res.length(0);
+      if (part_info->linear_hash_ind)
+        tmp_res.append(partition_keywords[PKW_LINEAR].str,
+                       partition_keywords[PKW_LINEAR].length);
       if (part_info->list_of_subpart_fields)
-        table->field[8]->store(partition_keywords[PKW_KEY].str,
-                               partition_keywords[PKW_KEY].length, cs);
+        tmp_res.append(partition_keywords[PKW_KEY].str,
+                       partition_keywords[PKW_KEY].length);
       else
-        table->field[8]->store(partition_keywords[PKW_HASH].str,
-                               partition_keywords[PKW_HASH].length, cs);
+        tmp_res.append(partition_keywords[PKW_HASH].str, 
+                       partition_keywords[PKW_HASH].length);
+      table->field[8]->store(tmp_res.ptr(), tmp_res.length(), cs);
       table->field[8]->set_notnull();
 
       /* Subpartition expression */
@@ -3936,14 +3940,13 @@ static int get_schema_partitions_record(THD *thd, struct st_table_list *tables,
       {
         table->field[10]->store(part_info->subpart_func_string,
                                 part_info->subpart_func_len, cs);
-        table->field[10]->set_notnull();
       }
       else if (part_info->list_of_subpart_fields)
       {
         collect_partition_expr(part_info->subpart_field_list, &tmp_str);
         table->field[10]->store(tmp_str.ptr(), tmp_str.length(), cs);
-        table->field[10]->set_notnull();
       }
+      table->field[10]->set_notnull();
     }
 
     while ((part_elem= part_it++))
@@ -5241,7 +5244,7 @@ ST_FIELD_INFO partitions_fields_info[]=
   {"PARTITION_ORDINAL_POSITION", 21 , MYSQL_TYPE_LONG, 0, 1, 0},
   {"SUBPARTITION_ORDINAL_POSITION", 21 , MYSQL_TYPE_LONG, 0, 1, 0},
   {"PARTITION_METHOD", 12, MYSQL_TYPE_STRING, 0, 1, 0},
-  {"SUBPARTITION_METHOD", 5, MYSQL_TYPE_STRING, 0, 1, 0},
+  {"SUBPARTITION_METHOD", 12, MYSQL_TYPE_STRING, 0, 1, 0},
   {"PARTITION_EXPRESSION", 65535, MYSQL_TYPE_STRING, 0, 1, 0},
   {"SUBPARTITION_EXPRESSION", 65535, MYSQL_TYPE_STRING, 0, 1, 0},
   {"PARTITION_DESCRIPTION", 65535, MYSQL_TYPE_STRING, 0, 1, 0},