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Allow asynchronous execution in more cases.

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In commit 27e1f1456, create_append_plan() only allowed the subplan
created from a given subpath to be executed asynchronously when it was
an async-capable ForeignPath.  To extend coverage, this patch handles
cases when the given subpath includes some other Path types as well that
can be omitted in the plan processing, such as a ProjectionPath directly
atop an async-capable ForeignPath, allowing asynchronous execution in
partitioned-scan/partitioned-join queries with non-Var tlist expressions
and more UNION queries.

Andrey Lepikhov and Etsuro Fujita, reviewed by Alexander Pyhalov and
Zhihong Yu.

Discussion: https://postgr.es/m/659c37a8-3e71-0ff2-394c-f04428c76f08%40postgrespro.ru
This commit is contained in:
Etsuro Fujita
2022-04-06 15:45:00 +09:00
parent 376dc437de
commit c2bb02bc2e
9 changed files with 287 additions and 15 deletions
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41
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -3245,6 +3245,13 @@ INSERT INTO result_tbl SELECT * FROM async_pt WHERE b === 505;
SELECT * FROM result_tbl ORDER BY a;
DELETE FROM result_tbl;
EXPLAIN (VERBOSE, COSTS OFF)
INSERT INTO result_tbl SELECT a, b, 'AAA' || c FROM async_pt WHERE b === 505;
INSERT INTO result_tbl SELECT a, b, 'AAA' || c FROM async_pt WHERE b === 505;
SELECT * FROM result_tbl ORDER BY a;
DELETE FROM result_tbl;
-- Check case where multiple partitions use the same connection
CREATE TABLE base_tbl3 (a int, b int, c text);
CREATE FOREIGN TABLE async_p3 PARTITION OF async_pt FOR VALUES FROM (3000) TO (4000)
@ -3286,6 +3293,13 @@ INSERT INTO join_tbl SELECT * FROM async_pt t1, async_pt t2 WHERE t1.a = t2.a AN
SELECT * FROM join_tbl ORDER BY a1;
DELETE FROM join_tbl;
EXPLAIN (VERBOSE, COSTS OFF)
INSERT INTO join_tbl SELECT t1.a, t1.b, 'AAA' || t1.c, t2.a, t2.b, 'AAA' || t2.c FROM async_pt t1, async_pt t2 WHERE t1.a = t2.a AND t1.b = t2.b AND t1.b % 100 = 0;
INSERT INTO join_tbl SELECT t1.a, t1.b, 'AAA' || t1.c, t2.a, t2.b, 'AAA' || t2.c FROM async_pt t1, async_pt t2 WHERE t1.a = t2.a AND t1.b = t2.b AND t1.b % 100 = 0;
SELECT * FROM join_tbl ORDER BY a1;
DELETE FROM join_tbl;
RESET enable_partitionwise_join;
-- Test rescan of an async Append node with do_exec_prune=false
@ -3357,6 +3371,33 @@ DROP INDEX base_tbl1_idx;
DROP INDEX base_tbl2_idx;
DROP INDEX async_p3_idx;
-- UNION queries
EXPLAIN (VERBOSE, COSTS OFF)
INSERT INTO result_tbl
(SELECT a, b, 'AAA' || c FROM async_p1 ORDER BY a LIMIT 10)
UNION
(SELECT a, b, 'AAA' || c FROM async_p2 WHERE b < 10);
INSERT INTO result_tbl
(SELECT a, b, 'AAA' || c FROM async_p1 ORDER BY a LIMIT 10)
UNION
(SELECT a, b, 'AAA' || c FROM async_p2 WHERE b < 10);
SELECT * FROM result_tbl ORDER BY a;
DELETE FROM result_tbl;
EXPLAIN (VERBOSE, COSTS OFF)
INSERT INTO result_tbl
(SELECT a, b, 'AAA' || c FROM async_p1 ORDER BY a LIMIT 10)
UNION ALL
(SELECT a, b, 'AAA' || c FROM async_p2 WHERE b < 10);
INSERT INTO result_tbl
(SELECT a, b, 'AAA' || c FROM async_p1 ORDER BY a LIMIT 10)
UNION ALL
(SELECT a, b, 'AAA' || c FROM async_p2 WHERE b < 10);
SELECT * FROM result_tbl ORDER BY a;
DELETE FROM result_tbl;
-- Test that pending requests are processed properly
SET enable_mergejoin TO false;
SET enable_hashjoin TO false;