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-rw-r--r--src/include/access/rtree.h17
1 files changed, 11 insertions, 6 deletions
diff --git a/src/include/access/rtree.h b/src/include/access/rtree.h
index a5c76855f22..d06ccdcff09 100644
--- a/src/include/access/rtree.h
+++ b/src/include/access/rtree.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/rtree.h,v 1.36 2004/12/31 22:03:21 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/access/rtree.h,v 1.37 2005/01/18 23:25:55 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@@ -59,11 +59,14 @@ typedef struct RTSTACK
/*
* When we're doing a scan, we need to keep track of the parent stack
* for the marked and current items. Also, rtrees have the following
- * property: if you're looking for the box (1,1,2,2), on the internal
- * nodes you have to search for all boxes that *contain* (1,1,2,2), and
- * not the ones that match it. We have a private scan key for internal
- * nodes in the opaque structure for rtrees for this reason. See
- * access/index-rtree/rtscan.c and rtstrat.c for how it gets initialized.
+ * property: if you're looking for the box (1,1,2,2), on the internal
+ * nodes you have to search for all boxes that *contain* (1,1,2,2),
+ * and not the ones that match it. We have a private scan key for
+ * internal nodes in the opaque structure for rtrees for this reason.
+ * See access/index-rtree/rtscan.c and rtstrat.c for how it gets
+ * initialized. We also keep pins on the scan's current buffer and
+ * marked buffer, if any: this avoids the need to invoke ReadBuffer()
+ * for each tuple produced by the index scan.
*/
typedef struct RTreeScanOpaqueData
@@ -73,6 +76,8 @@ typedef struct RTreeScanOpaqueData
uint16 s_flags;
int s_internalNKey;
ScanKey s_internalKey;
+ Buffer curbuf;
+ Buffer markbuf;
} RTreeScanOpaqueData;
typedef RTreeScanOpaqueData *RTreeScanOpaque;