fix for bug #1790:

"BIT_AND() result in GROUP BY different when SQL_BIG_RESULT used"

return value of BIT_AND changed to BIGINT SIGNED
Also the patch fixes another bug: when temporary table is in use and one of
values in group is NULL, BIT_AND always returns zero.
Fixed it to always skip null values.


mysql-test/r/func_group.result:
  bug #1790: test results fixed
sql/item_sum.cc:
  fix for bug #1790:
  update_field() rewritten to use add() and thus was moved
  to Item_sum_bit::update_field()
  Item_sum_bit::reset_field() was rewritten to take into account
  reset_bits.
sql/item_sum.h:
  fix for bug #1790:
  Item_sum::update_field() and Item_sum::reset_field() commented
  Item_sum_and changed to return BIGINT SIGNED
  Item_sum_and::update_field() and Item_sum_or::update_field)
  were replaced with generic Item_sum_bit::update_field()

1 files changed, 12 insertions, 24 deletions

diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 835278ae262..36a3c6b009b 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -615,9 +615,18 @@ void Item_sum_avg::reset_field()
 
 void Item_sum_bit::reset_field()
 {
+  char *res= result_field->ptr;
+  bits= reset_bits;
+  add();
+  int8store(res, bits);
+}
+
+void Item_sum_bit::update_field()
+{
   char *res=result_field->ptr;
-  ulonglong nr=(ulonglong) args[0]->val_int();
-  int8store(res,nr);
+  bits= uint8korr(res);
+  add();
+  int8store(res, bits);
 }
 
 /*
@@ -756,28 +765,6 @@ Item_sum_hybrid::min_max_update_int_field()
 }
 
 
-void Item_sum_or::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()
-{
-  ulonglong nr;
-  char *res=result_field->ptr;
-
-  nr=uint8korr(res);
-  nr&= (ulonglong) args[0]->val_int();
-  int8store(res,nr);
-}
-
-
 Item_avg_field::Item_avg_field(Item_sum_avg *item)
 {
   name=item->name;
@@ -787,6 +774,7 @@ Item_avg_field::Item_avg_field(Item_sum_avg *item)
   maybe_null=1;
 }
 
+
 double Item_avg_field::val()
 {
   double nr;