Merge mysql.com:/home/alexi/mysql-4.1

into  mysql.com:/home/alexi/dev/mysql-4.1-0

1 files changed, 38 insertions, 17 deletions

diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h
index 697b26bb1ae..03ab9c5b34d 100644
--- a/sql/item_cmpfunc.h
+++ b/sql/item_cmpfunc.h
@@ -358,17 +358,49 @@ public:
 };
 
 
-class Item_func_between :public Item_int_func
+/*
+  The class Item_func_opt_neg is defined to factor out the functionality
+  common for the classes Item_func_between and Item_func_in. The objects
+  of these classes can express predicates or there negations.
+  The alternative approach would be to create pairs Item_func_between,
+  Item_func_notbetween and Item_func_in, Item_func_notin.
+
+*/
+
+class Item_func_opt_neg :public Item_int_func
+{
+public:
+  bool negated;     /* <=> the item represents NOT <func> */
+  bool pred_level;  /* <=> [NOT] <func> is used on a predicate level */
+public:
+  Item_func_opt_neg(Item *a, Item *b, Item *c)
+    :Item_int_func(a, b, c), negated(0), pred_level(0) {}
+  Item_func_opt_neg(List<Item> &list)
+    :Item_int_func(list), negated(0), pred_level(0) {}
+public:
+  inline void negate() { negated= !negated; }
+  inline void top_level_item() { pred_level= 1; }
+  Item *neg_transformer(THD *thd)
+  {
+    negated= !negated;
+    return this;
+  }
+};
+
+
+class Item_func_between :public Item_func_opt_neg
 {
   DTCollation cmp_collation;
 public:
   Item_result cmp_type;
   String value0,value1,value2;
-  Item_func_between(Item *a,Item *b,Item *c) :Item_int_func(a,b,c) {}
+  Item_func_between(Item *a, Item *b, Item *c)
+    :Item_func_opt_neg(a, b, c) {}
   longlong val_int();
   optimize_type select_optimize() const { return OPTIMIZE_KEY; }
   enum Functype functype() const   { return BETWEEN; }
   const char *func_name() const { return "between"; }
+  bool fix_fields(THD *, struct st_table_list *, Item **);
   void fix_length_and_dec();
   void print(String *str);
   CHARSET_INFO *compare_collation() { return cmp_collation.collation; }
@@ -433,15 +465,9 @@ public:
   longlong val_int();
   String *val_str(String *str);
   enum Item_result result_type () const { return cached_result_type; }
-  bool fix_fields(THD *thd,struct st_table_list *tlist, Item **ref)
-  {
-    DBUG_ASSERT(fixed == 0);
-    args[0]->top_level_item();
-    return Item_func::fix_fields(thd, tlist, ref);
-  }
+  bool fix_fields(THD *, struct st_table_list *, Item **);
   void fix_length_and_dec();
   const char *func_name() const { return "if"; }
-  table_map not_null_tables() const { return 0; }
 };
 
 
@@ -736,7 +762,7 @@ public:
   }
 };
 
-class Item_func_in :public Item_int_func
+class Item_func_in :public Item_func_opt_neg
 {
   Item_result cmp_type;
   in_vector *array;
@@ -745,11 +771,12 @@ class Item_func_in :public Item_int_func
   DTCollation cmp_collation;
  public:
   Item_func_in(List<Item> &list)
-    :Item_int_func(list), array(0), in_item(0), have_null(0)
+    :Item_func_opt_neg(list), array(0), in_item(0), have_null(0)
   {
     allowed_arg_cols= 0;  // Fetch this value from first argument
   }
   longlong val_int();
+  bool fix_fields(THD *, struct st_table_list *, Item **);
   void fix_length_and_dec();
   void cleanup()
   {
@@ -769,12 +796,6 @@ class Item_func_in :public Item_int_func
   bool nulls_in_row();
   bool is_bool_func() { return 1; }
   CHARSET_INFO *compare_collation() { return cmp_collation.collation; }
-  /*
-    IN() protect from NULL only first argument, if construction like
-    "expression IN ()" will be allowed, we will need to check number of
-    argument here, because "NOT(NULL IN ())" is TRUE.
-  */
-  table_map not_null_tables() const { return args[0]->not_null_tables(); }
 };
 
 /* Functions used by where clause */