pageinspect: Try to fix some bugs in previous commit.

Commit 08bf6e52 seems not to have
used the correct *GetDatum and PG_GETARG_* macros for the SQL types
in some cases, and some of the SQL types seem to have been poorly
chosen, too.  Try to fix it.  I'm not sure if this is the reason
why the buildfarm is currently unhappy with this code, but it
seems like a good place to start.

Buildfarm unhappiness reported by Tom Lane.

contrib/pageinspect/hashfuncs.c

@@ -32,10 +32,10 @@ PG_FUNCTION_INFO_V1(hash_metapage_info);
  */
 typedef struct HashPageStat
 {
-	uint16		live_items;
-	uint16		dead_items;
-	uint16		page_size;
-	uint16		free_size;
+	int		live_items;
+	int		dead_items;
+	int		page_size;
+	int		free_size;
 
 	/* opaque data */
 	BlockNumber hasho_prevblkno;
@@ -256,15 +256,15 @@ hash_page_stats(PG_FUNCTION_ARGS)
 	MemSet(nulls, 0, sizeof(nulls));
 
 	j = 0;
-	values[j++] = UInt16GetDatum(stat.live_items);
-	values[j++] = UInt16GetDatum(stat.dead_items);
-	values[j++] = UInt16GetDatum(stat.page_size);
-	values[j++] = UInt16GetDatum(stat.free_size);
-	values[j++] = UInt32GetDatum(stat.hasho_prevblkno);
-	values[j++] = UInt32GetDatum(stat.hasho_nextblkno);
-	values[j++] = UInt32GetDatum(stat.hasho_bucket);
-	values[j++] = UInt16GetDatum(stat.hasho_flag);
-	values[j++] = UInt16GetDatum(stat.hasho_page_id);
+	values[j++] = Int32GetDatum(stat.live_items);
+	values[j++] = Int32GetDatum(stat.dead_items);
+	values[j++] = Int32GetDatum(stat.page_size);
+	values[j++] = Int32GetDatum(stat.free_size);
+	values[j++] = Int64GetDatum((int64) stat.hasho_prevblkno);
+	values[j++] = Int64GetDatum((int64) stat.hasho_nextblkno);
+	values[j++] = Int64GetDatum((int64) stat.hasho_bucket);
+	values[j++] = Int32GetDatum((int32) stat.hasho_flag);
+	values[j++] = Int32GetDatum((int32) stat.hasho_page_id);
 
 	tuple = heap_form_tuple(tupleDesc, values, nulls);
 
@@ -388,7 +388,7 @@ Datum
 hash_bitmap_info(PG_FUNCTION_ARGS)
 {
 	Oid			indexRelid = PG_GETARG_OID(0);
-	uint32		ovflblkno = PG_GETARG_UINT32(1);
+	BlockNumber ovflblkno = (BlockNumber) PG_GETARG_INT64(1);
 	HashMetaPage metap;
 	Buffer		buf,
 				metabuf;

contrib/pageinspect/pageinspect--1.5--1.6.sql

@@ -19,14 +19,14 @@ LANGUAGE C STRICT PARALLEL SAFE;
 -- hash_page_stats()
 --
 CREATE FUNCTION hash_page_stats(IN page bytea,
-    OUT live_items smallint,
-    OUT dead_items smallint,
-    OUT page_size smallint,
-    OUT free_size smallint,
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT page_size int4,
+    OUT free_size int4,
     OUT hasho_prevblkno int8,
     OUT hasho_nextblkno int8,
     OUT hasho_bucket int8,
-	OUT hasho_flag smallint,
+	OUT hasho_flag int4,
 	OUT hasho_page_id int4)
 AS 'MODULE_PATHNAME', 'hash_page_stats'
 LANGUAGE C STRICT PARALLEL SAFE;