Revert patch for bigint handling in double context as it broke normal bigint handling

The right way to fix this is to change the Field::store(longlong) method to be
Field::store(longlong, bool unsigned_flag), but this is better to do in 4.1 than in 4.0

mysql-test/r/bigint.result

@@ -15,9 +15,11 @@ select 9223372036854775808+1;
 9223372036854775809
 drop table if exists t1;
 create table t1 (a bigint unsigned not null, primary key(a));
-insert into t1 values (18446744073709551615), (0xFFFFFFFFFFFFFFFE);
+insert into t1 values (18446744073709551615), (0xFFFFFFFFFFFFFFFE), (18446744073709551613), (18446744073709551612);
 select * from t1;
 a
+18446744073709551612
+18446744073709551613
 18446744073709551614
 18446744073709551615
 select * from t1 where a=18446744073709551615;
@@ -26,6 +28,8 @@ a
 delete from t1 where a=18446744073709551615;
 select * from t1;
 a
+18446744073709551612
+18446744073709551613
 18446744073709551614
 drop table t1;
 create table t1 ( a int not null default 1, big bigint );
@@ -69,9 +73,11 @@ id	a
 drop table t1;
 CREATE TABLE t1 ( quantity decimal(60,0));
 insert into t1 values (10000000000000000000);
+insert into t1 values (10000000000000000000.0);
 insert into t1 values ('10000000000000000000');
 select * from t1;
 quantity
+-8446744073709551616
 10000000000000000000
 10000000000000000000
 drop table t1;

mysql-test/t/bigint.test

@@ -14,7 +14,7 @@ select 9223372036854775808+1;
 
 drop table if exists t1;
 create table t1 (a bigint unsigned not null, primary key(a));
-insert into t1 values (18446744073709551615), (0xFFFFFFFFFFFFFFFE);
+insert into t1 values (18446744073709551615), (0xFFFFFFFFFFFFFFFE), (18446744073709551613), (18446744073709551612);
 select * from t1;
 select * from t1 where a=18446744073709551615;
 # select * from t1 where a='18446744073709551615';
@@ -50,10 +50,12 @@ drop table t1;
 #
 # Item_uint::save_to_field()
 # BUG#1845
+# This can't be fixed in MySQL 4.0 without loosing precisions for bigints
 #
 
 CREATE TABLE t1 ( quantity decimal(60,0));
 insert into t1 values (10000000000000000000);
+insert into t1 values (10000000000000000000.0);
 insert into t1 values ('10000000000000000000');
 select * from t1;
 drop table t1;

sql/item.cc

@@ -548,18 +548,6 @@ bool Item_string::save_in_field(Field *field, bool no_conversions)
   return 0;
 }
 
-bool Item_uint::save_in_field(Field *field, bool no_conversions)
-{
-  longlong nr=val_int();
-  if (null_value)
-    return set_field_to_null(field);
-  field->set_notnull();
-  if (nr < 0)
-    field->store(ulonglong2double(nr));
-  else
-    field->store(nr);
-  return 0;
-}
 
 bool Item_int::save_in_field(Field *field, bool no_conversions)
 {

sql/item.h

@@ -232,7 +232,6 @@ class Item_uint :public Item_int
   String *val_str(String*);
   void make_field(Send_field *field);
   Item *new_item() { return new Item_uint(name,max_length); }
-  bool save_in_field(Field *field, bool no_conversions);
   bool fix_fields(THD *thd,struct st_table_list *table_list)
   {
     unsigned_flag= 1;