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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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22
src/backend/optimizer/plan/createplan.c
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@ -125,6 +125,7 @@ static BitmapHeapScan *create_bitmap_scan_plan(PlannerInfo *root,
List *tlist, List *scan_clauses);
static Plan *create_bitmap_subplan(PlannerInfo *root, Path *bitmapqual,
List **qual, List **indexqual, List **indexECs);
static void bitmap_subplan_mark_shared(Plan *plan);
static TidScan *create_tidscan_plan(PlannerInfo *root, TidPath *best_path,
List *tlist, List *scan_clauses);
static SubqueryScan *create_subqueryscan_plan(PlannerInfo *root,
@ -2590,6 +2591,9 @@ create_bitmap_scan_plan(PlannerInfo *root,
&bitmapqualorig, &indexquals,
&indexECs);
if (best_path->path.parallel_aware)
bitmap_subplan_mark_shared(bitmapqualplan);
/*
* The qpqual list must contain all restrictions not automatically handled
* by the index, other than pseudoconstant clauses which will be handled
@ -4756,6 +4760,24 @@ label_sort_with_costsize(PlannerInfo *root, Sort *plan, double limit_tuples)
plan->plan.parallel_aware = false;
}
/*
* bitmap_subplan_mark_shared
* Set isshared flag in bitmap subplan so that it will be created in
* shared memory.
*/
static void
bitmap_subplan_mark_shared(Plan *plan)
{
if (IsA(plan, BitmapAnd))
bitmap_subplan_mark_shared(
linitial(((BitmapAnd *) plan)->bitmapplans));
else if (IsA(plan, BitmapOr))
((BitmapOr *) plan)->isshared = true;
else if (IsA(plan, BitmapIndexScan))
((BitmapIndexScan *) plan)->isshared = true;
else
elog(ERROR, "unrecognized node type: %d", nodeTag(plan));
}
/*****************************************************************************
*