hashscan-no-lsn.patch

diff --git a/src/backend/access/hash/hashsearch.c b/src/backend/access/hash/hashsearch.c
index ce5515dbcb..81a206eeb7 100644
--- a/src/backend/access/hash/hashsearch.c
+++ b/src/backend/access/hash/hashsearch.c
@@ -463,12 +463,6 @@ _hash_readpage(IndexScanDesc scan, Buffer *bufP, ScanDirection dir)
 	opaque = (HashPageOpaque) PageGetSpecialPointer(page);
 
 	so->currPos.buf = buf;
-
-	/*
-	 * We save the LSN of the page as we read it, so that we know whether it
-	 * is safe to apply LP_DEAD hints to the page later.
-	 */
-	so->currPos.lsn = PageGetLSN(page);
 	so->currPos.currPage = BufferGetBlockNumber(buf);
 
 	if (ScanDirectionIsForward(dir))
@@ -508,7 +502,6 @@ _hash_readpage(IndexScanDesc scan, Buffer *bufP, ScanDirection dir)
 			{
 				so->currPos.buf = buf;
 				so->currPos.currPage = BufferGetBlockNumber(buf);
-				so->currPos.lsn = PageGetLSN(page);
 			}
 			else
 			{
@@ -562,7 +555,6 @@ _hash_readpage(IndexScanDesc scan, Buffer *bufP, ScanDirection dir)
 			{
 				so->currPos.buf = buf;
 				so->currPos.currPage = BufferGetBlockNumber(buf);
-				so->currPos.lsn = PageGetLSN(page);
 			}
 			else
 			{
diff --git a/src/backend/access/hash/hashutil.c b/src/backend/access/hash/hashutil.c
index a825b82706..df77252267 100644
--- a/src/backend/access/hash/hashutil.c
+++ b/src/backend/access/hash/hashutil.c
@@ -579,21 +579,7 @@ _hash_kill_items(IndexScanDesc scan)
 	else
 		buf = _hash_getbuf(rel, blkno, HASH_READ, LH_OVERFLOW_PAGE);
 
-	/*
-	 * If page LSN differs it means that the page was modified since the last
-	 * read. killedItems could be not valid so applying LP_DEAD hints is not
-	 * safe.
-	 */
 	page = BufferGetPage(buf);
-	if (PageGetLSN(page) != so->currPos.lsn)
-	{
-		if (havePin)
-			LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-		else
-			_hash_relbuf(rel, buf);
-		return;
-	}
-
 	opaque = (HashPageOpaque) PageGetSpecialPointer(page);
 	maxoff = PageGetMaxOffsetNumber(page);
 
diff --git a/src/include/access/hash.h b/src/include/access/hash.h
index 0e0f3e17a7..e3135c1738 100644
--- a/src/include/access/hash.h
+++ b/src/include/access/hash.h
@@ -117,7 +117,6 @@ typedef struct HashScanPosItem	/* what we remember about each match */
 typedef struct HashScanPosData
 {
 	Buffer		buf;			/* if valid, the buffer is pinned */
-	XLogRecPtr	lsn;			/* pos in the WAL stream when page was read */
 	BlockNumber currPage;		/* current hash index page */
 	BlockNumber nextPage;		/* next overflow page */
 	BlockNumber prevPage;		/* prev overflow or bucket page */
@@ -153,7 +152,6 @@ typedef struct HashScanPosData
 #define HashScanPosInvalidate(scanpos) \
 	do { \
 		(scanpos).buf = InvalidBuffer; \
-		(scanpos).lsn = InvalidXLogRecPtr; \
 		(scanpos).currPage = InvalidBlockNumber; \
 		(scanpos).nextPage = InvalidBlockNumber; \
 		(scanpos).prevPage = InvalidBlockNumber; \