Clean up code associated with updating pg_class statistics columns

(relpages/reltuples).  To do this, create formal support in heapam.c for
"overwrite" tuple updates (including xlog replay capability) and use that
instead of the ad-hoc overwrites we'd been using in VACUUM and CREATE INDEX.
Take the responsibility for updating stats during CREATE INDEX out of the
individual index AMs, and do it where it belongs, in catalog/index.c.  Aside
from being more modular, this avoids having to update the same tuple twice in
some paths through CREATE INDEX.  It's probably not measurably faster, but
for sure it's a lot cleaner than before.

1 files changed, 10 insertions, 4 deletions

diff --git a/src/backend/access/hash/hash.c b/src/backend/access/hash/hash.c
index ff54052f6d..d94104854e 100644
--- a/src/backend/access/hash/hash.c
+++ b/src/backend/access/hash/hash.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.89 2006/05/02 22:25:10 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.90 2006/05/10 23:18:38 tgl Exp $
  *
  * NOTES
  *	  This file contains only the public interface routines.
@@ -51,6 +51,7 @@ hashbuild(PG_FUNCTION_ARGS)
 	Relation	heap = (Relation) PG_GETARG_POINTER(0);
 	Relation	index = (Relation) PG_GETARG_POINTER(1);
 	IndexInfo  *indexInfo = (IndexInfo *) PG_GETARG_POINTER(2);
+	IndexBuildResult *result;
 	double		reltuples;
 	HashBuildState buildstate;
 
@@ -72,10 +73,15 @@ hashbuild(PG_FUNCTION_ARGS)
 	reltuples = IndexBuildHeapScan(heap, index, indexInfo,
 								   hashbuildCallback, (void *) &buildstate);
 
-	/* since we just counted the # of tuples, may as well update stats */
-	IndexCloseAndUpdateStats(heap, reltuples, index, buildstate.indtuples);
+	/*
+	 * Return statistics
+	 */
+	result = (IndexBuildResult *) palloc(sizeof(IndexBuildResult));
 
-	PG_RETURN_VOID();
+	result->heap_tuples = reltuples;
+	result->index_tuples = buildstate.indtuples;
+
+	PG_RETURN_POINTER(result);
 }
 
 /*