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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/include/optimizer/paths.h
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@@ -56,6 +56,8 @@ extern RelOptInfo *standard_join_search(PlannerInfo *root, int levels_needed,
extern void generate_gather_paths(PlannerInfo *root, RelOptInfo *rel);
extern int compute_parallel_worker(RelOptInfo *rel, BlockNumber heap_pages,
BlockNumber index_pages);
extern void create_partial_bitmap_paths(PlannerInfo *root, RelOptInfo *rel,
Path *bitmapqual);
#ifdef OPTIMIZER_DEBUG
extern void debug_print_rel(PlannerInfo *root, RelOptInfo *rel);