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Support parallel bitmap heap scans.

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The index is scanned by a single process, but then all cooperating
processes can iterate jointly over the resulting set of heap blocks.
In the future, we might also want to support using a parallel bitmap
index scan to set up for a parallel bitmap heap scan, but that's a
job for another day.

Dilip Kumar, with some corrections and cosmetic changes by me.  The
larger patch set of which this is a part has been reviewed and tested
by (at least) Andres Freund, Amit Khandekar, Tushar Ahuja, Rafia
Sabih, Haribabu Kommi, Thomas Munro, and me.

Discussion: http://postgr.es/m/CAFiTN-uc4=0WxRGfCzs-xfkMYcSEWUC-Fon6thkJGjkh9i=13A@mail.gmail.com
This commit is contained in:
Robert Haas
2017-03-08 12:05:43 -05:00
parent 4eafdcc276
commit f35742ccb7
24 changed files with 615 additions and 58 deletions
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4
src/backend/executor/nodeBitmapIndexscan.c
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@ -78,7 +78,9 @@ MultiExecBitmapIndexScan(BitmapIndexScanState *node)
else
{
/* XXX should we use less than work_mem for this? */
tbm = tbm_create(work_mem * 1024L, NULL);
tbm = tbm_create(work_mem * 1024L,
((BitmapIndexScan *) node->ss.ps.plan)->isshared ?
node->ss.ps.state->es_query_dsa : NULL);
}
/*