The added aggregates are:

(1) boolean-and and boolean-or aggregates named bool_and and bool_or.
    they (SHOULD;-) correspond to standard sql every and some/any aggregates.
    they do not have the right name as there is a problem with
    the standard and the parser for some/any. Tom also think that
    the standard name is misleading because NULL are ignored.
    Also add 'every' aggregate.

(2) bitwise integer aggregates named bit_and and bit_or for
    int2, int4, int8 and bit types. They are not standard, but I find
    them useful. I needed them once.


The patches adds:

- 2 new very short strict functions for boolean aggregates in
  src/backed/utils/adt/bool.c,
  src/include/utils/builtins.h and src/include/catalog/pg_proc.h

- the new aggregates declared in src/include/catalog/pg_proc.h and
  src/include/catalog/pg_aggregate.h

- some documentation and validation about these new aggregates.

Fabien COELHO

src/backend/utils/adt/bool.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/bool.c,v 1.32 2004/05/07 00:24:58 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/bool.c,v 1.33 2004/05/26 15:25:59 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -248,3 +248,23 @@ isnotfalse(PG_FUNCTION_ARGS)
 
 	PG_RETURN_BOOL(b);
 }
+
+/*
+ * boolean-and and boolean-or aggregates.
+ */
+
+/* function for standard EVERY aggregate implementation conforming to SQL 2003.
+ * must be strict. It is also named bool_and for homogeneity.
+ */
+Datum booland_statefunc(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_BOOL(PG_GETARG_BOOL(0) && PG_GETARG_BOOL(1));
+}
+
+/* function for standard ANY/SOME aggregate conforming to SQL 2003.
+ * must be strict. The name of the aggregate is bool_or. See the doc.
+ */
+Datum boolor_statefunc(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_BOOL(PG_GETARG_BOOL(0) || PG_GETARG_BOOL(1));
+}