Merge commit 'a4bebdd92624e018108c2610fc3f2c1584b6c687' into master

This is the commit merge of Postgres-XC with the intersection of
PostgreSQL REL9_1_STABLE and master branches.

Conflicts:
	COPYRIGHT
	contrib/pgbench/pgbench.c
	src/Makefile
	src/backend/access/transam/recovery.conf.sample
	src/backend/access/transam/varsup.c
	src/backend/access/transam/xlog.c
	src/backend/catalog/Makefile
	src/backend/catalog/dependency.c
	src/backend/catalog/system_views.sql
	src/backend/commands/copy.c
	src/backend/commands/explain.c
	src/backend/commands/sequence.c
	src/backend/commands/tablecmds.c
	src/backend/commands/vacuum.c
	src/backend/executor/nodeAgg.c
	src/backend/nodes/copyfuncs.c
	src/backend/nodes/equalfuncs.c
	src/backend/nodes/outfuncs.c
	src/backend/nodes/readfuncs.c
	src/backend/optimizer/path/allpaths.c
	src/backend/optimizer/plan/createplan.c
	src/backend/optimizer/plan/setrefs.c
	src/backend/parser/gram.y
	src/backend/parser/parse_utilcmd.c
	src/backend/postmaster/postmaster.c
	src/backend/rewrite/rewriteHandler.c
	src/backend/storage/lmgr/proc.c
	src/backend/tcop/postgres.c
	src/backend/utils/adt/ruleutils.c
	src/backend/utils/init/postinit.c
	src/backend/utils/misc/guc.c
	src/backend/utils/misc/postgresql.conf.sample
	src/backend/utils/sort/tuplesort.c
	src/bin/initdb/initdb.c
	src/bin/pg_ctl/pg_ctl.c
	src/bin/pg_dump/pg_dump.c
	src/include/access/xlog.h
	src/include/catalog/catversion.h
	src/include/catalog/indexing.h
	src/include/catalog/pg_aggregate.h
	src/include/catalog/pg_proc.h
	src/include/commands/copy.h
	src/include/nodes/parsenodes.h
	src/include/nodes/primnodes.h
	src/include/optimizer/pathnode.h
	src/include/parser/kwlist.h
	src/include/storage/procarray.h
	src/test/regress/expected/.gitignore
	src/test/regress/expected/aggregates.out
	src/test/regress/expected/alter_table.out
	src/test/regress/expected/bit.out
	src/test/regress/expected/box.out
	src/test/regress/expected/delete.out
	src/test/regress/expected/float4.out
	src/test/regress/expected/float8.out
	src/test/regress/expected/int2.out
	src/test/regress/expected/int8.out
	src/test/regress/expected/interval.out
	src/test/regress/expected/numeric.out
	src/test/regress/expected/point.out
	src/test/regress/expected/polygon.out
	src/test/regress/expected/sequence.out
	src/test/regress/expected/timestamp.out
	src/test/regress/expected/timestamptz.out
	src/test/regress/expected/transactions.out
	src/test/regress/expected/window.out
	src/test/regress/input/misc.source
	src/test/regress/output/create_misc_1.source
	src/test/regress/output/misc.source
	src/test/regress/sql/aggregates.sql
	src/test/regress/sql/alter_table.sql
	src/test/regress/sql/bit.sql
	src/test/regress/sql/box.sql
	src/test/regress/sql/delete.sql
	src/test/regress/sql/domain.sql
	src/test/regress/sql/float4.sql
	src/test/regress/sql/float8.sql
	src/test/regress/sql/int2.sql
	src/test/regress/sql/int8.sql
	src/test/regress/sql/interval.sql
	src/test/regress/sql/lseg.sql
	src/test/regress/sql/numeric.sql
	src/test/regress/sql/path.sql
	src/test/regress/sql/point.sql
	src/test/regress/sql/polygon.sql
	src/test/regress/sql/portals.sql
	src/test/regress/sql/sequence.sql
	src/test/regress/sql/timestamp.sql
	src/test/regress/sql/timestamptz.sql
	src/test/regress/sql/transactions.sql
	src/test/regress/sql/window.sql
	src/test/regress/sql/with.sql

1 files changed, 16 insertions, 9 deletions

diff --git a/src/include/access/gist.h b/src/include/access/gist.h
index c3c5493f76..df9f39c7b8 100644
--- a/src/include/access/gist.h
+++ b/src/include/access/gist.h
@@ -6,10 +6,10 @@
  *	  changes should be made with care.
  *
  *
- * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/gist.h,v 1.63 2010/01/02 16:58:00 momjian Exp $
+ * src/include/access/gist.h
  *
  *-------------------------------------------------------------------------
  */
@@ -32,7 +32,8 @@
 #define GIST_PENALTY_PROC				5
 #define GIST_PICKSPLIT_PROC				6
 #define GIST_EQUAL_PROC					7
-#define GISTNProcs						7
+#define GIST_DISTANCE_PROC				8
+#define GISTNProcs						8
 
 /*
  * strategy numbers for GiST opclasses that want to implement the old
@@ -52,13 +53,15 @@
 #define RTOverAboveStrategyNumber		12
 #define RTOldContainsStrategyNumber		13		/* for old spelling of @> */
 #define RTOldContainedByStrategyNumber	14		/* for old spelling of <@ */
+#define RTKNNSearchStrategyNumber		15
 
 /*
  * Page opaque data in a GiST index page.
  */
-#define F_LEAF				(1 << 0)
-#define F_DELETED			(1 << 1)
-#define F_TUPLES_DELETED	(1 << 2)
+#define F_LEAF				(1 << 0)	/* leaf page */
+#define F_DELETED			(1 << 1)	/* the page has been deleted */
+#define F_TUPLES_DELETED	(1 << 2)	/* some tuples on the page are dead */
+#define F_FOLLOW_RIGHT		(1 << 3)	/* page to the right has no downlink */
 
 typedef XLogRecPtr GistNSN;
 
@@ -130,14 +133,18 @@ typedef struct GISTENTRY
 #define GistMarkTuplesDeleted(page) ( GistPageGetOpaque(page)->flags |= F_TUPLES_DELETED)
 #define GistClearTuplesDeleted(page)	( GistPageGetOpaque(page)->flags &= ~F_TUPLES_DELETED)
 
+#define GistFollowRight(page) ( GistPageGetOpaque(page)->flags & F_FOLLOW_RIGHT)
+#define GistMarkFollowRight(page) ( GistPageGetOpaque(page)->flags |= F_FOLLOW_RIGHT)
+#define GistClearFollowRight(page)	( GistPageGetOpaque(page)->flags &= ~F_FOLLOW_RIGHT)
+
 /*
- * Vector of GISTENTRY structs; user-defined methods union and pick
- * split takes it as one of their arguments
+ * Vector of GISTENTRY structs; user-defined methods union and picksplit
+ * take it as one of their arguments
  */
 typedef struct
 {
 	int32		n;				/* number of elements */
-	GISTENTRY	vector[1];
+	GISTENTRY	vector[1];		/* variable-length array */
 } GistEntryVector;
 
 #define GEVHDRSZ	(offsetof(GistEntryVector, vector))