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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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3
src/backend/postmaster/pgstat.c
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@@ -3395,6 +3395,9 @@ pgstat_get_wait_ipc(WaitEventIPC w)
case WAIT_EVENT_PARALLEL_FINISH:
event_name = "ParallelFinish";
break;
case WAIT_EVENT_PARALLEL_BITMAP_SCAN:
event_name = "ParallelBitmapScan";
break;
case WAIT_EVENT_SAFE_SNAPSHOT:
event_name = "SafeSnapshot";
break;