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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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16
src/backend/access/heap/heapam.c
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@ -1753,6 +1753,22 @@ retry:
return page;
}
/* ----------------
* heap_update_snapshot
*
* Update snapshot info in heap scan descriptor.
* ----------------
*/
void
heap_update_snapshot(HeapScanDesc scan, Snapshot snapshot)
{
Assert(IsMVCCSnapshot(snapshot));
RegisterSnapshot(snapshot);
scan->rs_snapshot = snapshot;
scan->rs_temp_snap = true;
}
/* ----------------
* heap_getnext - retrieve next tuple in scan
*