From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Tue, 28 May 2002 15:22:44 +0000 (+0000)
Subject: Repair error with not adjusting active scans properly after gistSplit.
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=d36bf9afa402169eb36732b46790495f2ba6cec3;p=users%2Fbernd%2Fpostgres.git

Repair error with not adjusting active scans properly after gistSplit.
Patch from Teodor Sigaev.
---

diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 27b6cb0aca..af67ab1c14 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -494,6 +494,14 @@ gistlayerinsert(Relation r, BlockNumber blkno,
 		/* key is modified, so old version must be deleted */
 		ItemPointerSet(&oldtid, blkno, child);
 		gistdelete(r, &oldtid);
+	
+		/*
+		 * if child was splitted, new key for child will be inserted
+		 * in the end list of child, so we must say to any scans
+		 * that page is changed beginning from 'child' offset
+		 */
+		if ( ret & SPLITED )
+			gistadjscans(r, GISTOP_SPLIT, blkno, child);
 	}
 
 	ret = INSERTED;
@@ -1411,10 +1419,6 @@ gistSplit(Relation r,
 		ItemPointerSet(&(newtup[nlen - 1]->t_tid), lbknum, 1);
 	}
 
-
-	/* adjust active scans */
-	gistadjscans(r, GISTOP_SPLIT, BufferGetBlockNumber(buffer), FirstOffsetNumber);
-
 	/* !!! pfree */
 	pfree(rvectup);
 	pfree(lvectup);