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Started support for parallel index scan [skip ci]

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This commit is contained in:
Andrew Kane
2023-03-25 15:51:59 -07:00
parent ec12d79cbc
commit 0950968c11
2 changed files with 46 additions and 4 deletions
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33
src/ivfflat.c
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@@ -103,7 +103,13 @@ ivfflatcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
if (ratio > 1)
ratio = 1;
// cost estimates for parallel workers applied outside of amcostestimate
elog(INFO, "parallel_workers = %d, parallel aware = %d", path->path.parallel_workers, path->path.parallel_aware);
costs.indexTotalCost *= ratio;
costs.numIndexPages *= ratio;
elog(INFO, "ivfflatcostestimate = %f", costs.indexTotalCost);
/* Startup cost and total cost are same */
*indexStartupCost = costs.indexTotalCost;
@@ -151,6 +157,25 @@ ivfflatvalidate(Oid opclassoid)
return true;
}
static Size
ivfflatestimateparallelscan()
{
elog(INFO, "ivfflatestimateparallelscan");
return 0;
}
static void
ivfflatinitparallelscan(void *target)
{
elog(INFO, "ivfflatinitparallelscan");
}
static void
ivfflatparallelrescan(IndexScanDesc scan)
{
elog(INFO, "ivfflatparallelrescan");
}
/*
* Define index handler
*
@@ -178,7 +203,7 @@ ivfflathandler(PG_FUNCTION_ARGS)
amroutine->amstorage = false;
amroutine->amclusterable = false;
amroutine->ampredlocks = false;
amroutine->amcanparallel = false;
amroutine->amcanparallel = true;
amroutine->amcaninclude = false;
#if PG_VERSION_NUM >= 130000
amroutine->amusemaintenanceworkmem = false; /* not used during VACUUM */
@@ -212,9 +237,9 @@ ivfflathandler(PG_FUNCTION_ARGS)
amroutine->amrestrpos = NULL;
/* Interface functions to support parallel index scans */
amroutine->amestimateparallelscan = NULL;
amroutine->aminitparallelscan = NULL;
amroutine->amparallelrescan = NULL;
amroutine->amestimateparallelscan = ivfflatestimateparallelscan;
amroutine->aminitparallelscan = ivfflatinitparallelscan;
amroutine->amparallelrescan = ivfflatparallelrescan;
PG_RETURN_POINTER(amroutine);
}

17
test/sql/ivfflat_parallel.sql Normal file
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@@ -0,0 +1,17 @@
SET client_min_messages = warning;
CREATE EXTENSION IF NOT EXISTS vector;
--SET force_parallel_mode = on;
SET parallel_setup_cost = 10;
SET parallel_tuple_cost = 0.001;
SET min_parallel_table_scan_size = 0;
SET min_parallel_index_scan_size = 0;
CREATE TABLE t (id integer, val vector(3));
INSERT INTO t (id, val) SELECT n, ARRAY[random(), random(), random()] FROM generate_series(1,1000000) n;
CREATE INDEX ON t USING ivfflat (val) WITH (lists = 10);
SET ivfflat.probes = 2;
EXPLAIN SELECT * FROM t ORDER BY val <-> '[0.5,0.5,0.5]' LIMIT 5;
SELECT * FROM t ORDER BY val <-> '[0.5,0.5,0.5]' LIMIT 5;
DROP TABLE t;