code cleanup: removed unused constructors and methods

sql/item_subselect.cc:
  removed unused constructors
sql/item_subselect.h:
  removed unused constructors & methods

sql/item_subselect.cc

@@ -470,19 +470,6 @@ String *Item_in_subselect::val_str(String *str)
   return str;
 }
 
-Item_in_subselect::Item_in_subselect(Item_in_subselect *item):
-  Item_exists_subselect(item)
-{
-  left_expr= item->left_expr;
-  abort_on_null= item->abort_on_null;
-}
-
-Item_allany_subselect::Item_allany_subselect(Item_allany_subselect *item):
-  Item_in_subselect(item)
-{
-  func= item->func;
-}
-
 Item_subselect::trans_res
 Item_in_subselect::single_value_transformer(JOIN *join,
 					    Item *left_expr,

sql/item_subselect.h

@@ -56,17 +56,6 @@ class Item_subselect :public Item_result_field
 		  EXISTS_SUBS, IN_SUBS, ALLANY_SUBS};
 
   Item_subselect();
-  Item_subselect(Item_subselect *item)
-  {
-    substitution= item->substitution;
-    null_value= item->null_value;
-    decimals= item->decimals;
-    max_columns= item->max_columns;
-    engine= item->engine;
-    engine_owner= 0;
-    engine_changed= item->engine_changed;
-    name= item->name;
-  }
 
   virtual subs_type substype() { return UNKNOWN_SUBS; }
 
@@ -123,13 +112,6 @@ class Item_singlerow_subselect :public Item_subselect
   Item_cache *value, **row;
 public:
   Item_singlerow_subselect(THD *thd, st_select_lex *select_lex);
-  Item_singlerow_subselect(Item_singlerow_subselect *item):
-    Item_subselect(item)
-  {
-    value= item->value;
-    max_length= item->max_length;
-    decimals= item->decimals;
-  }
 
   subs_type substype() { return SINGLEROW_SUBS; }
 
@@ -139,7 +121,6 @@ class Item_singlerow_subselect :public Item_subselect
   double val();
   longlong val_int ();
   String *val_str (String *);
-  Item *new_item() { return new Item_singlerow_subselect(this); }
   enum Item_result result_type() const;
   void fix_length_and_dec();
 
@@ -162,11 +143,6 @@ class Item_exists_subselect :public Item_subselect
 
 public:
   Item_exists_subselect(THD *thd, st_select_lex *select_lex);
-  Item_exists_subselect(Item_exists_subselect *item):
-    Item_subselect(item)
-  {
-    value= item->value;
-  }
   Item_exists_subselect(): Item_subselect() {}
 
   subs_type substype() { return EXISTS_SUBS; }
@@ -175,7 +151,6 @@ class Item_exists_subselect :public Item_subselect
     value= 0;
   }
 
-  Item *new_item() { return new Item_exists_subselect(this); }
   enum Item_result result_type() const { return INT_RESULT;}
   longlong val_int();
   double val();
@@ -203,7 +178,6 @@ class Item_in_subselect :public Item_exists_subselect
   bool abort_on_null;
 public:
   Item_in_subselect(THD *thd, Item * left_expr, st_select_lex *select_lex);
-  Item_in_subselect(Item_in_subselect *item);
   Item_in_subselect(): Item_exists_subselect(), abort_on_null(0) {}
 
   subs_type substype() { return IN_SUBS; }
@@ -239,7 +213,7 @@ class Item_allany_subselect :public Item_in_subselect
 public:
   Item_allany_subselect(THD *thd, Item * left_expr, compare_func_creator f,
 		     st_select_lex *select_lex);
-  Item_allany_subselect(Item_allany_subselect *item);
+
   subs_type substype() { return ALLANY_SUBS; }
   trans_res select_transformer(JOIN *join);
 };