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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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19
src/backend/optimizer/path/indxpath.c
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@@ -337,8 +337,12 @@ create_index_paths(PlannerInfo *root, RelOptInfo *rel)
bitmapqual = choose_bitmap_and(root, rel, bitindexpaths);
bpath = create_bitmap_heap_path(root, rel, bitmapqual,
rel->lateral_relids, 1.0);
rel->lateral_relids, 1.0, 0);
add_path(rel, (Path *) bpath);
/* create a partial bitmap heap path */
if (rel->consider_parallel && rel->lateral_relids == NULL)
create_partial_bitmap_paths(root, rel, bitmapqual);
}
/*
@@ -410,7 +414,7 @@ create_index_paths(PlannerInfo *root, RelOptInfo *rel)
required_outer = get_bitmap_tree_required_outer(bitmapqual);
loop_count = get_loop_count(root, rel->relid, required_outer);
bpath = create_bitmap_heap_path(root, rel, bitmapqual,
required_outer, loop_count);
required_outer, loop_count, 0);
add_path(rel, (Path *) bpath);
}
}
@@ -1617,6 +1621,11 @@ bitmap_scan_cost_est(PlannerInfo *root, RelOptInfo *rel, Path *ipath)
bpath.path.pathkeys = NIL;
bpath.bitmapqual = ipath;
/*
* Check the cost of temporary path without considering parallelism.
* Parallel bitmap heap path will be considered at later stage.
*/
bpath.path.parallel_workers = 0;
cost_bitmap_heap_scan(&bpath.path, root, rel,
bpath.path.param_info,
ipath,
@@ -1659,6 +1668,12 @@ bitmap_and_cost_est(PlannerInfo *root, RelOptInfo *rel, List *paths)
bpath.path.pathkeys = NIL;
bpath.bitmapqual = (Path *) &apath;
/*
* Check the cost of temporary path without considering parallelism.
* Parallel bitmap heap path will be considered at later stage.
*/
bpath.path.parallel_workers = 0;
/* Now we can do cost_bitmap_heap_scan */
cost_bitmap_heap_scan(&bpath.path, root, rel,
bpath.path.param_info,