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Revise the TIDBitmap API to support multiple concurrent iterations over a

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bitmap.  This is extracted from Greg Stark's posix_fadvise patch; it seems
worth committing separately, since it's potentially useful independently of
posix_fadvise.
This commit is contained in:
Tom Lane
2009-01-10 21:08:36 +00:00
parent 3b34e98242
commit 43a57cf365
7 changed files with 151 additions and 88 deletions
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17
src/backend/executor/nodeBitmapHeapscan.c
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@ -21,7 +21,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeBitmapHeapscan.c,v 1.31 2009/01/01 17:23:41 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeBitmapHeapscan.c,v 1.32 2009/01/10 21:08:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -65,6 +65,7 @@ BitmapHeapNext(BitmapHeapScanState *node)
HeapScanDesc scan;
Index scanrelid;
TIDBitmap *tbm;
TBMIterator *tbmiterator;
TBMIterateResult *tbmres;
OffsetNumber targoffset;
TupleTableSlot *slot;
@ -78,6 +79,7 @@ BitmapHeapNext(BitmapHeapScanState *node)
scan = node->ss.ss_currentScanDesc;
scanrelid = ((BitmapHeapScan *) node->ss.ps.plan)->scan.scanrelid;
tbm = node->tbm;
tbmiterator = node->tbmiterator;
tbmres = node->tbmres;
/*
@ -111,7 +113,7 @@ BitmapHeapNext(BitmapHeapScanState *node)
/*
* If we haven't yet performed the underlying index scan, do it, and
* prepare the bitmap to be iterated over.
* begin the iteration over the bitmap.
*/
if (tbm == NULL)
{
@ -121,9 +123,8 @@ BitmapHeapNext(BitmapHeapScanState *node)
elog(ERROR, "unrecognized result from subplan");
node->tbm = tbm;
node->tbmiterator = tbmiterator = tbm_begin_iterate(tbm);
node->tbmres = tbmres = NULL;
tbm_begin_iterate(tbm);
}
for (;;)
@ -136,7 +137,7 @@ BitmapHeapNext(BitmapHeapScanState *node)
*/
if (tbmres == NULL)
{
node->tbmres = tbmres = tbm_iterate(tbm);
node->tbmres = tbmres = tbm_iterate(tbmiterator);
if (tbmres == NULL)
{
/* no more entries in the bitmap */
@ -376,9 +377,12 @@ ExecBitmapHeapReScan(BitmapHeapScanState *node, ExprContext *exprCtxt)
/* rescan to release any page pin */
heap_rescan(node->ss.ss_currentScanDesc, NULL);
if (node->tbmiterator)
tbm_end_iterate(node->tbmiterator);
if (node->tbm)
tbm_free(node->tbm);
node->tbm = NULL;
node->tbmiterator = NULL;
node->tbmres = NULL;
/*
@ -423,6 +427,8 @@ ExecEndBitmapHeapScan(BitmapHeapScanState *node)
/*
* release bitmap if any
*/
if (node->tbmiterator)
tbm_end_iterate(node->tbmiterator);
if (node->tbm)
tbm_free(node->tbm);
@ -466,6 +472,7 @@ ExecInitBitmapHeapScan(BitmapHeapScan *node, EState *estate, int eflags)
scanstate->ss.ps.state = estate;
scanstate->tbm = NULL;
scanstate->tbmiterator = NULL;
scanstate->tbmres = NULL;
/*