Implement "fastupdate" support for GIN indexes, in which we try to accumulate

multiple index entries in a holding area before adding them to the main index
structure.  This helps because bulk insert is (usually) significantly faster
than retail insert for GIN.

This patch also removes GIN support for amgettuple-style index scans.  The
API defined for amgettuple is difficult to support with fastupdate, and
the previously committed partial-match feature didn't really work with
it either.  We might eventually figure a way to put back amgettuple
support, but it won't happen for 8.4.

catversion bumped because of change in GIN's pg_am entry, and because
the format of GIN indexes changed on-disk (there's a metapage now,
and possibly a pending list).

Teodor Sigaev

1 files changed, 23 insertions, 1 deletions

diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 33447b671f1..176ebde0efd 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.133 2009/01/22 20:16:01 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.134 2009/03/24 20:17:13 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -496,6 +496,28 @@ analyze_rel(Oid relid, VacuumStmt *vacstmt,
 	/* We skip to here if there were no analyzable columns */
 cleanup:
 
+	/* If this isn't part of VACUUM ANALYZE, let index AMs do cleanup */
+	if (!vacstmt->vacuum)
+	{
+		for (ind = 0; ind < nindexes; ind++)
+		{
+			IndexBulkDeleteResult *stats;
+			IndexVacuumInfo ivinfo;
+
+			ivinfo.index = Irel[ind];
+			ivinfo.vacuum_full = false;
+			ivinfo.analyze_only = true;
+			ivinfo.message_level = elevel;
+			ivinfo.num_heap_tuples = -1; /* not known for sure */
+			ivinfo.strategy = vac_strategy;
+
+			stats = index_vacuum_cleanup(&ivinfo, NULL);
+
+			if (stats)
+				pfree(stats);
+		}
+	}
+
 	/* Done with indexes */
 	vac_close_indexes(nindexes, Irel, NoLock);