Merge linux-st28.site:/home/martin/mysql/src/bug30832-again/my50-bug30832-again

into  linux-st28.site:/home/martin/mysql/src/bug30832-again/my51-bug30832-again

mysql-test/r/func_misc.result

@@ -200,9 +200,15 @@ NULL
 SELECT NAME_CONST('test', 1);
 test
 1
+SELECT NAME_CONST('test', -1);
+test
+-1
 SELECT NAME_CONST('test', 1.0);
 test
 1.0
+SELECT NAME_CONST('test', -1.0);
+test
+-1.0
 SELECT NAME_CONST('test', 'test');
 test
 test

mysql-test/t/func_misc.test

@@ -208,7 +208,9 @@ SELECT NAME_CONST('test', UPPER('test'));
 
 SELECT NAME_CONST('test', NULL);
 SELECT NAME_CONST('test', 1);
+SELECT NAME_CONST('test', -1);
 SELECT NAME_CONST('test', 1.0);
+SELECT NAME_CONST('test', -1.0);
 SELECT NAME_CONST('test', 'test');
 
 --echo End of 5.0 tests

sql/item_func.h

@@ -436,6 +436,7 @@ public:
   longlong int_op();
   my_decimal *decimal_op(my_decimal *);
   const char *func_name() const { return "-"; }
+  virtual bool basic_const_item() const { return args[0]->basic_const_item(); }
   void fix_length_and_dec();
   void fix_num_length_and_dec();
   uint decimal_precision() const { return args[0]->decimal_precision(); }