Merging from mysql-5.1

mysql-test/r/func_like.result

@@ -182,4 +182,9 @@ INSERT INTO t2 VALUES (1), (2), (3);
 SELECT 1 FROM t2 JOIN t1 ON 1 LIKE a GROUP BY a;
 1
 DROP TABLE t1, t2;
+#
+# Bug#59149 valgrind warnings with "like .. escape .." function
+#
+SELECT '' LIKE '1' ESCAPE COUNT(1);
+ERROR HY000: Incorrect arguments to ESCAPE
 End of 5.1 tests

mysql-test/t/func_like.test

@@ -126,5 +126,10 @@ INSERT INTO t2 VALUES (1), (2), (3);
 SELECT 1 FROM t2 JOIN t1 ON 1 LIKE a GROUP BY a;
 DROP TABLE t1, t2;
 
+--echo #
+--echo # Bug#59149 valgrind warnings with "like .. escape .." function
+--echo #
+--error ER_WRONG_ARGUMENTS
+SELECT '' LIKE '1' ESCAPE COUNT(1);
 
 --echo End of 5.1 tests

sql/item_sum.h

@@ -445,6 +445,7 @@ class Item_sum :public Item_result_field
     forced_const= TRUE; 
   }
   virtual bool const_item() const { return forced_const; }
+  virtual bool const_during_execution() const { return false; }
   virtual void print(String *str, enum_query_type query_type);
   void fix_num_length_and_dec();