MDEV-10307 CAST(11068046444225730969 AS SIGNED) does not return a warning

mysql-test/main/cast.test

@@ -724,3 +724,9 @@ $$
 DELIMITER ;$$
 
 SET sql_mode=DEFAULT;
+
+--echo #
+--echo # MDEV-10307 CAST(11068046444225730969 AS SIGNED) does not return a warning
+--echo #
+
+SELECT CAST(11068046444225730969 AS SIGNED);

mysql-test/main/default.result

@@ -2217,6 +2217,8 @@ t1	CREATE TABLE `t1` (
   `b` bigint(20) DEFAULT (cast(`a` as signed))
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 INSERT INTO t1 (a) VALUES (0xFFFFFFFFFFFFFFFF);
+Warnings:
+Note	1105	Cast to signed converted positive out-of-range integer to it's negative complement
 SELECT * FROM t1;
 a	b
 18446744073709551615	-1

sql/item.cc

@@ -333,6 +333,15 @@ longlong Item::val_int_unsigned_typecast_from_int()
 }
 
 
+longlong Item::val_int_signed_typecast_from_int()
+{
+  longlong value= val_int();
+  if (!null_value && unsigned_flag && value < 0)
+    push_note_converted_to_negative_complement(current_thd);
+  return value;
+}
+
+
 String *Item::val_string_from_date(String *str)
 {
   MYSQL_TIME ltime;

sql/item.h

@@ -1057,6 +1057,13 @@ class Item: public Value_source,
   longlong val_int_unsigned_typecast_from_decimal();
   longlong val_int_unsigned_typecast_from_int();
   longlong val_int_unsigned_typecast_from_str();
+
+  /**
+    Get a value for CAST(x AS UNSIGNED).
+    Huge positive unsigned values are converted to negative complements.
+  */
+  longlong val_int_signed_typecast_from_int();
+
   /*
     This is just a shortcut to avoid the cast. You should still use
     unsigned_flag to check the sign of the item.

sql/sql_type.cc

@@ -3380,7 +3380,7 @@ longlong Type_handler_real_result::
 longlong Type_handler_int_result::
            Item_val_int_signed_typecast(Item *item) const
 {
-  return item->val_int();
+  return item->val_int_signed_typecast_from_int();
 }
 
 longlong Type_handler_decimal_result::