Add in bit_xor function (approved by Sergei)

sql/item_sum.cc:
  Add in bit_xor class functions.
sql/item_sum.h:
  Add bit_xor class.
sql/lex.h:
  Add in bit_xor symbol.
sql/sql_yacc.yy:
  Add in bit_xor function
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

@@ -30,6 +30,7 @@ greg@mysql.com
 guilhem@mysql.com
 gweir@build.mysql.com
 gweir@work.mysql.com
+harrison@mysql.com
 heikki@donna.mysql.fi
 heikki@hundin.mysql.fi
 heikki@rescue.

sql/item_sum.cc

@@ -625,6 +625,20 @@ bool Item_sum_or::add()
   return 0;
 }
 
+Item *Item_sum_xor::copy_or_same(THD* thd)
+{
+  return new (&thd->mem_root) Item_sum_xor(thd, *this);
+}
+
+
+bool Item_sum_xor::add()
+{
+  ulonglong value= (ulonglong) args[0]->val_int();
+  if (!args[0]->null_value)
+    bits^=value;
+  return 0;
+}
+
 Item *Item_sum_and::copy_or_same(THD* thd)
 {
   return new (&thd->mem_root) Item_sum_and(thd, *this);
@@ -912,6 +926,15 @@ void Item_sum_or::update_field()
   int8store(res,nr);
 }
 
+void Item_sum_xor::update_field()
+{
+  ulonglong nr;
+  char *res=result_field->ptr;
+
+  nr=uint8korr(res);
+  nr^= (ulonglong) args[0]->val_int();
+  int8store(res,nr);
+}
 
 void Item_sum_and::update_field()
 {

sql/item_sum.h

@@ -484,6 +484,18 @@ class Item_sum_and :public Item_sum_bit
   Item *copy_or_same(THD* thd);
 };
 
+class Item_sum_xor :public Item_sum_bit
+{
+  public:
+  Item_sum_xor(Item *item_par) :Item_sum_bit(item_par,LL(0)) {}
+  Item_sum_xor(THD *thd, Item_sum_xor &item) :Item_sum_bit(thd, item) {}
+  bool add();
+  void update_field();
+  const char *func_name() const { return "bit_xor"; }
+  Item *copy_or_same(THD* thd);
+};
+
+
 /*
 **	user defined aggregates
 */

sql/lex.h

@@ -465,6 +465,7 @@ static SYMBOL sql_functions[] = {
   { "BIT_COUNT",	SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_bit_count)},
   { "BIT_OR",		SYM(BIT_OR),0,0},
   { "BIT_AND",		SYM(BIT_AND),0,0},
+  { "BIT_XOR",		SYM(BIT_XOR),0,0},
   { "CAST",		SYM(CAST_SYM),0,0},
   { "CEIL",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ceiling)},
   { "CEILING",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ceiling)},

sql/sql_yacc.yy

@@ -449,6 +449,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	BETWEEN_SYM
 %token	BIT_AND
 %token	BIT_OR
+%token  BIT_XOR
 %token	CASE_SYM
 %token	CONCAT
 %token	CONCAT_WS
@@ -2846,6 +2847,8 @@ sum_expr:
 	  { $$=new Item_sum_and($3); }
 	| BIT_OR  '(' in_sum_expr ')'
 	  { $$=new Item_sum_or($3); }
+	| BIT_XOR  '(' in_sum_expr ')'
+	  { $$=new Item_sum_xor($3); }
 	| COUNT_SYM '(' opt_all '*' ')'
 	  { $$=new Item_sum_count(new Item_int((int32) 0L,1)); }
 	| COUNT_SYM '(' in_sum_expr ')'