after review patch

mysql-test/r/negation_elimination.result:
  new tests of negation elimination
mysql-test/t/negation_elimination.test:
  new tests of negation elimination
sql/item.h:
  test of boolean functions added
sql/item_cmpfunc.cc:
  NOT subtree is already checked, so wee need to return just argument
sql/item_cmpfunc.h:
  test of boolean functions added
sql/mysql_priv.h:
  'place' to detect WHERE clause
sql/sql_parse.cc:
  function for creation negated expression
sql/sql_select.cc:
  removed unused function
sql/sql_select.h:
  removed unused function
sql/sql_yacc.yy:
  'place' to detect WHERE clause

1 files changed, 1 insertions, 4 deletions

diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index de37e858bac..53ec17fd59d 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -2707,9 +2707,6 @@ longlong Item_cond_xor::val_int()
        IS NULL(a)         -> IS NOT NULL(a)
        IS NOT NULL(a)     -> IS NULL(a)
 
-  NOTE
-    This method is used in the eliminate_not_funcs() function.
-
   RETURN
     New item or
     NULL if we cannot apply NOT transformation (see Item::neg_transformer()).
@@ -2718,7 +2715,7 @@ longlong Item_cond_xor::val_int()
 Item *Item_func_not::neg_transformer(THD *thd)	/* NOT(x)  ->  x */
 {
   // We should apply negation elimination to the argument of the NOT function
-  return eliminate_not_funcs(thd, args[0]);
+  return args[0];
 }