Post-review fixes for bug #1790 'BIT_AND() result in GROUP BY different when

SQL_BIG_RESULT used':
- BIT_AND now returns BIGINT UNSIGNED
- in case there were no matching rows BIT_AND returns 18446744073709551615 
(but not NULL), BIT_OR returns 0 (but not NULL). That's how Monty wants it
and how is described in our docs.

include/my_global.h

@@ -603,11 +603,25 @@ extern double		my_atof(const char*);
 #define HAVE_LONG_LONG 1
 #endif
 
+/*
+  Some pre-ANSI-C99 systems like AIX 5.1 and Linux/GCC 2.95 define
+  ULONGLONG_MAX, LONGLONG_MIN, LONGLONG_MAX; we use them if they're defined.
+*/
+
 #if defined(HAVE_LONG_LONG) && !defined(LONGLONG_MIN)
 #define LONGLONG_MIN	((long long) 0x8000000000000000LL)
 #define LONGLONG_MAX	((long long) 0x7FFFFFFFFFFFFFFFLL)
 #endif
 
+#if defined(HAVE_LONG_LONG) && !defined(ULONLONG_MAX)
+/* First check for ANSI C99 definition: */
+#ifdef ULLONG_MAX
+#define ULONGLONG_MAX  ULLONG_MAX
+#else
+#define ULONGLONG_MAX ((unsigned long long)(~0ULL))
+#endif
+#endif /* defined (HAVE_LONG_LONG) && !defined(ULONLONG_MAX)*/
+
 #if SIZEOF_LONG == 4
 #define INT_MIN32	(long) 0x80000000L
 #define INT_MAX32	(long) 0x7FFFFFFFL

mysql-test/r/func_group.result

@@ -47,7 +47,7 @@ sum(all a)	count(all a)	avg(all a)	std(all a)	bit_or(all a)	bit_and(all a)	min(a
 21	6	3.5000	1.7078	7	0	1	6		E
 select grp, sum(a),count(a),avg(a),std(a),bit_or(a),bit_and(a),min(a),max(a),min(c),max(c) from t1 group by grp;
 grp	sum(a)	count(a)	avg(a)	std(a)	bit_or(a)	bit_and(a)	min(a)	max(a)	min(c)	max(c)
-NULL	NULL	0	NULL	NULL	0	-1	NULL	NULL		
+NULL	NULL	0	NULL	NULL	0	18446744073709551615	NULL	NULL		
 1	1	1	1.0000	0.0000	1	1	1	1	a	a
 2	5	2	2.5000	0.5000	3	2	2	3	b	c
 3	15	3	5.0000	0.8165	7	4	4	6	C	E
@@ -218,8 +218,8 @@ insert into t1 values (1,null);
 insert into t1 values (2,null);
 select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
 a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
-1	0	NULL	NULL	NULL	NULL	NULL	-1	0
+1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
-2	0	NULL	NULL	NULL	NULL	NULL	-1	0
+2	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
 select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
 a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
 1	0	NULL	NULL	NULL	NULL	NULL	-1	0
@@ -227,7 +227,7 @@ a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
 insert into t1 values (2,1);
 select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
 a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
-1	0	NULL	NULL	NULL	NULL	NULL	-1	0
+1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
 2	1	1	1.0000	0.0000	1	1	1	1
 select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
 a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
@@ -236,7 +236,7 @@ a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
 insert into t1 values (3,1);
 select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
 a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
-1	0	NULL	NULL	NULL	NULL	NULL	-1	0
+1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
 2	1	1	1.0000	0.0000	1	1	1	1
 3	1	1	1.0000	0.0000	1	1	1	1
 select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;

sql/item_sum.cc

@@ -615,10 +615,8 @@ void Item_sum_avg::reset_field()
 
 void Item_sum_bit::reset_field()
 {
-  char *res= result_field->ptr;
+  reset();
-  bits= reset_bits;
+  int8store(result_field->ptr, bits);
-  add();
-  int8store(res, bits);
 }
 
 void Item_sum_bit::update_field()

sql/item_sum.h

@@ -373,6 +373,8 @@ class Item_sum_bit :public Item_sum_int
   void reset_field();
   void update_field();
   unsigned int size_of() { return sizeof(*this);}  
+  void fix_length_and_dec()
+  { decimals=0; max_length=21; unsigned_flag=1; maybe_null=null_value=0; }
 };
 
 
@@ -383,20 +385,16 @@ public:
   bool add();
   const char *func_name() const { return "bit_or"; }
   unsigned int size_of() { return sizeof(*this);}  
-  void fix_length_and_dec()
-  { decimals=0; max_length=21; unsigned_flag=1; maybe_null=null_value=0; }
 };
 
 
 class Item_sum_and :public Item_sum_bit
 {
 public:
-  Item_sum_and(Item *item_par) :Item_sum_bit(item_par, ~(ulonglong) LL(0)) {}
+  Item_sum_and(Item *item_par) :Item_sum_bit(item_par, ULONGLONG_MAX) {}
   bool add();
   const char *func_name() const { return "bit_and"; }
   unsigned int size_of() { return sizeof(*this);}  
-  void fix_length_and_dec()
-  { decimals=0; max_length=21; unsigned_flag=0; maybe_null=null_value=0; }
 };
 
 /*