MDEV-20363 Assertion `is_unsigned() == attr.unsigned_flag' failed in...

MDEV-20363 Assertion `is_unsigned() == attr.unsigned_flag' failed in Type_handler_longlong::make_table_field

mysql-test/main/type_int.result

@@ -377,3 +377,18 @@ DROP TABLE t1;
 #
 # End of 10.4 tests
 #
+#
+# Start of 10.5 tests
+#
+#
+# MDEV-20363 Assertion `is_unsigned() == attr.unsigned_flag' failed in Type_handler_longlong::make_table_field
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT DISTINCT 1 FROM t1 GROUP BY 0 >> NULL WITH ROLLUP;
+1
+1
+DROP TABLE t1;
+#
+# End of 10.5 tests
+#

mysql-test/main/type_int.test

@@ -263,3 +263,21 @@ DROP TABLE t1;
 --echo #
 --echo # End of 10.4 tests
 --echo #
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-20363 Assertion `is_unsigned() == attr.unsigned_flag' failed in Type_handler_longlong::make_table_field
+--echo #
+
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT DISTINCT 1 FROM t1 GROUP BY 0 >> NULL WITH ROLLUP;
+DROP TABLE t1;
+
+
+--echo #
+--echo # End of 10.5 tests
+--echo #

sql/item_func.h

@@ -1939,9 +1939,7 @@ class Item_func_rollup_const :public Item_func
   const Type_handler *type_handler() const { return args[0]->type_handler(); }
   bool fix_length_and_dec()
   {
-    collation= args[0]->collation;
-    max_length= args[0]->max_length;
-    decimals=args[0]->decimals;
+    Type_std_attributes::set(*args[0]);
     return FALSE;
   }
   Item *get_copy(THD *thd)