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Enable backward sequential scan even after reaching EOF.

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This commit is contained in:
Hiroshi Inoue 2000-02-09 03:49:47 +00:00
parent 9e34883565
commit 3dec14197b
1 changed files with 1 additions and 21 deletions
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22
src/backend/access/heap/heapam.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * 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 * INTERFACE ROUTINES
@ -848,11 +848,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
if (scan->rs_ptup.t_data == scan->rs_ctup.t_data && if (scan->rs_ptup.t_data == scan->rs_ctup.t_data &&
BufferIsInvalid(scan->rs_pbuf)) 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; return NULL;
} }
@ -910,11 +905,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
scan->rs_ptup.t_datamcxt = NULL; scan->rs_ptup.t_datamcxt = NULL;
scan->rs_ptup.t_data = NULL; scan->rs_ptup.t_data = NULL;
scan->rs_pbuf = InvalidBuffer; 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; return NULL;
} }
@ -934,11 +924,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
if (scan->rs_ctup.t_data == scan->rs_ntup.t_data && if (scan->rs_ctup.t_data == scan->rs_ntup.t_data &&
BufferIsInvalid(scan->rs_nbuf)) 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 */ HEAPDEBUG_3; /* heap_getnext returns NULL at end */
return NULL; return NULL;
} }
@ -998,11 +983,6 @@ heap_getnext(HeapScanDesc scandesc, int backw)
scan->rs_ntup.t_datamcxt = NULL; scan->rs_ntup.t_datamcxt = NULL;
scan->rs_ntup.t_data = NULL; scan->rs_ntup.t_data = NULL;
scan->rs_nbuf = InvalidBuffer; 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 */ HEAPDEBUG_6; /* heap_getnext returning EOS */
return NULL; return NULL;
} }