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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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2
src/backend/nodes/copyfuncs.c
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@@ -331,6 +331,7 @@ _copyBitmapOr(const BitmapOr *from)
/*
* copy remainder of node
*/
COPY_SCALAR_FIELD(isshared);
COPY_NODE_FIELD(bitmapplans);
return newnode;
@@ -496,6 +497,7 @@ _copyBitmapIndexScan(const BitmapIndexScan *from)
* copy remainder of node
*/
COPY_SCALAR_FIELD(indexid);
COPY_SCALAR_FIELD(isshared);
COPY_NODE_FIELD(indexqual);
COPY_NODE_FIELD(indexqualorig);