MDEV-4269 fix.

Item_default_value inherited form Item_field so should create temporary table field similary.

mysql-test/r/func_group_innodb.result

@@ -185,3 +185,17 @@ member_id_to	COUNT(*)
 518491	5
 DROP TABLE t1;
 # End of test  BUG#12713907
+#
+# MDEV-4269: crash when grouping by values()
+#
+SELECT @@storage_engine INTO @old_engine;
+set storage_engine=innodb;
+create table y select 1 b;
+select 1 from y group by b;
+1
+1
+select 1 from y group by values(b);
+1
+1
+drop table y;
+SET storage_engine=@old_engine;

mysql-test/t/func_group_innodb.test

@@ -127,3 +127,17 @@ SELECT member_id_to, COUNT(*) FROM t1 WHERE r_date =
 DROP TABLE t1;
 
 --echo # End of test  BUG#12713907
+
+--echo #
+--echo # MDEV-4269: crash when grouping by values()
+--echo #
+
+SELECT @@storage_engine INTO @old_engine;
+set storage_engine=innodb;
+
+create table y select 1 b;
+select 1 from y group by b;
+select 1 from y group by values(b);
+drop table y;
+SET storage_engine=@old_engine;
+

sql/sql_select.cc

@@ -9922,6 +9922,7 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
   }
   case Item::FIELD_ITEM:
   case Item::DEFAULT_VALUE_ITEM:
+  case Item::INSERT_VALUE_ITEM:
   {
     Item_field *field= (Item_field*) item;
     bool orig_modify= modify_item;