MDEV-16707 Add an accessor in Item_func_like class for the negated attribute

sql/item_cmpfunc.h

@@ -2642,6 +2642,9 @@ public:
     Item_bool_func2(thd, a, b), canDoTurboBM(FALSE), pattern(0), pattern_len(0),
     bmGs(0), bmBc(0), escape_item(escape_arg),
     escape_used_in_parsing(escape_used), use_sampling(0), negated(0) {}
+
+  bool get_negated() const { return negated; } // Used by ColumnStore
+
   longlong val_int();
   enum Functype functype() const { return LIKE_FUNC; }
   void print(String *str, enum_query_type query_type);