Enable backward sequential scan even after reaching EOF.

diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index cc503c32511efaea43d3dcb9d837276a4fa0ea0d..d51705fa4726ff60cde33d7fd8f423aa8bffa8c2 100644 (file)
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.65 2000/01/26 05:55:56 momjian Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.66 2000/02/09 03:49:47 inoue Exp $
  *
  *
  * INTERFACE ROUTINES
@@ -848,11 +848,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
        if (scan->rs_ptup.t_data == scan->rs_ctup.t_data &&
            BufferIsInvalid(scan->rs_pbuf))
        {
-           if (BufferIsValid(scan->rs_nbuf))
-               ReleaseBuffer(scan->rs_nbuf);
-           scan->rs_ntup.t_datamcxt = NULL;
-           scan->rs_ntup.t_data = NULL;
-           scan->rs_nbuf = UnknownBuffer;
            return NULL;
        }
 
@@ -910,11 +905,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
            scan->rs_ptup.t_datamcxt = NULL;
            scan->rs_ptup.t_data = NULL;
            scan->rs_pbuf = InvalidBuffer;
-           if (BufferIsValid(scan->rs_nbuf))
-               ReleaseBuffer(scan->rs_nbuf);
-           scan->rs_ntup.t_datamcxt = NULL;
-           scan->rs_ntup.t_data = NULL;
-           scan->rs_nbuf = InvalidBuffer;
            return NULL;
        }
 
@@ -934,11 +924,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
        if (scan->rs_ctup.t_data == scan->rs_ntup.t_data &&
            BufferIsInvalid(scan->rs_nbuf))
        {
-           if (BufferIsValid(scan->rs_pbuf))
-               ReleaseBuffer(scan->rs_pbuf);
-           scan->rs_ptup.t_datamcxt = NULL;
-           scan->rs_ptup.t_data = NULL;
-           scan->rs_pbuf = UnknownBuffer;
            HEAPDEBUG_3;        /* heap_getnext returns NULL at end */
            return NULL;
        }
@@ -998,11 +983,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
            scan->rs_ntup.t_datamcxt = NULL;
            scan->rs_ntup.t_data = NULL;
            scan->rs_nbuf = InvalidBuffer;
-           if (BufferIsValid(scan->rs_pbuf))
-               ReleaseBuffer(scan->rs_pbuf);
-           scan->rs_ptup.t_datamcxt = NULL;
-           scan->rs_ptup.t_data = NULL;
-           scan->rs_pbuf = InvalidBuffer;
            HEAPDEBUG_6;        /* heap_getnext returning EOS */
            return NULL;
        }