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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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6
doc/src/sgml/monitoring.sgml
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@ -1211,7 +1211,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry>Waiting in an extension.</entry>
</row>
<row>
<entry morerows="10"><literal>IPC</></entry>
<entry morerows="11"><literal>IPC</></entry>
<entry><literal>BgWorkerShutdown</></entry>
<entry>Waiting for background worker to shut down.</entry>
</row>
@ -1247,6 +1247,10 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry><literal>ParallelFinish</></entry>
<entry>Waiting for parallel workers to finish computing.</entry>
</row>
<row>
<entry><literal>ParallelBitmapPopulate</></entry>
<entry>Waiting for the leader to populate the TidBitmap.</entry>
</row>
<row>
<entry><literal>SafeSnapshot</></entry>
<entry>Waiting for a snapshot for a <literal>READ ONLY DEFERRABLE</> transaction.</entry>