Previous "64-bit fix" for intagg didn't actually work. This is already

fixed properly in CVS tip, but we need a band-aid for back branches.
Per report from Ron Mayer.

contrib/intagg/int_aggregate.c

@@ -144,10 +144,12 @@ int_agg_state(PG_FUNCTION_ARGS)
 	PGARRAY    *state;
 	PGARRAY    *p;
 
-	if (PG_ARGISNULL(0))
-		state = NULL;
-	else
-		state = (PGARRAY *) PG_GETARG_POINTER(0);
+	/*
+	 * We can keep a pointer in the datum even though nodeAgg thinks it's
+	 * an int4.  Note we assume the initial state of int4 zero will look
+	 * like a null pointer.
+	 */
+	state = (PGARRAY *) PG_GETARG_POINTER(0);
 	p = GetPGArray(state, 1);
 
 	if (!PG_ARGISNULL(1))

contrib/intagg/int_aggregate.sql.in

@@ -1,16 +1,22 @@
 -- Adjust this setting to control where the objects get created.
 SET search_path = public;
 
+--
+-- The aggregate transition state (denoted INT4 in caps below) is really
+-- an array, ie, int4[].  We have to lie and pretend it is a pass-by-value
+-- datatype so that nodeAgg.c will not try to do memory management for it.
+--
+
 -- Internal function for the aggregate
 -- Is called for each item in an aggregation
-CREATE OR REPLACE FUNCTION int_agg_state (int4[], int4)
-RETURNS int4[]
+CREATE OR REPLACE FUNCTION int_agg_state (INT4, int4)
+RETURNS INT4
 AS 'MODULE_PATHNAME','int_agg_state'
-LANGUAGE 'C';
+LANGUAGE 'C' STRICT;
 
 -- Internal function for the aggregate
 -- Is called at the end of the aggregation, and returns an array.
-CREATE OR REPLACE FUNCTION int_agg_final_array (int4[])
+CREATE OR REPLACE FUNCTION int_agg_final_array (INT4)
 RETURNS int4[]
 AS 'MODULE_PATHNAME','int_agg_final_array'
 LANGUAGE 'C' STRICT;
@@ -20,14 +26,15 @@ LANGUAGE 'C' STRICT;
 CREATE AGGREGATE int_array_aggregate (
 	BASETYPE = int4,
 	SFUNC = int_agg_state,
-	STYPE = int4[],
-	FINALFUNC = int_agg_final_array
+	STYPE = INT4,
+	FINALFUNC = int_agg_final_array,
+	INITCOND = 0
 );
 
 -- The aggregate component functions are not designed to be called
 -- independently, so disable public access to them
-REVOKE ALL ON FUNCTION int_agg_state (int4[], int4) FROM PUBLIC;
-REVOKE ALL ON FUNCTION int_agg_final_array (int4[]) FROM PUBLIC;
+REVOKE ALL ON FUNCTION int_agg_state (INT4, int4) FROM PUBLIC;
+REVOKE ALL ON FUNCTION int_agg_final_array (INT4) FROM PUBLIC;
 
 -- The enumeration function
 -- returns each element in a one dimensional integer array