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postgres_fdw: Fix interaction of PHVs with child joins.

Browse Source 
Commit f49842d1ee introduced the
concept of a child join, but did not update this code accordingly.

Ashutosh Bapat, with cosmetic changes by me

Discussion: http://postgr.es/m/CAFjFpRf=J_KPOtw+bhZeURYkbizr8ufSaXg6gPEF6DKpgH-t6g@mail.gmail.com
This commit is contained in:
Robert Haas
2018-02-22 10:03:14 -05:00
parent de6428afe1
commit 84cb51b4e2
3 changed files with 50 additions and 1 deletions
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40
contrib/postgres_fdw/expected/postgres_fdw.out
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@ -7800,4 +7800,44 @@ SELECT t1.a,t1.b FROM fprt1 t1, LATERAL (SELECT t2.a, t2.b FROM fprt2 t2 WHERE t
400 | 400
(4 rows)
-- with PHVs, partition-wise join selected but no join pushdown
EXPLAIN (COSTS OFF)
SELECT t1.a, t1.phv, t2.b, t2.phv FROM (SELECT 't1_phv' phv, * FROM fprt1 WHERE a % 25 = 0) t1 FULL JOIN (SELECT 't2_phv' phv, * FROM fprt2 WHERE b % 25 = 0) t2 ON (t1.a = t2.b) ORDER BY t1.a, t2.b;
QUERY PLAN
------------------------------------------------------------
Sort
Sort Key: ftprt1_p1.a, ftprt2_p1.b
-> Result
-> Append
-> Hash Full Join
Hash Cond: (ftprt1_p1.a = ftprt2_p1.b)
-> Foreign Scan on ftprt1_p1
-> Hash
-> Foreign Scan on ftprt2_p1
-> Hash Full Join
Hash Cond: (ftprt1_p2.a = ftprt2_p2.b)
-> Foreign Scan on ftprt1_p2
-> Hash
-> Foreign Scan on ftprt2_p2
(14 rows)
SELECT t1.a, t1.phv, t2.b, t2.phv FROM (SELECT 't1_phv' phv, * FROM fprt1 WHERE a % 25 = 0) t1 FULL JOIN (SELECT 't2_phv' phv, * FROM fprt2 WHERE b % 25 = 0) t2 ON (t1.a = t2.b) ORDER BY t1.a, t2.b;
a | phv | b | phv
-----+--------+-----+--------
0 | t1_phv | 0 | t2_phv
50 | t1_phv | |
100 | t1_phv | |
150 | t1_phv | 150 | t2_phv
200 | t1_phv | |
250 | t1_phv | 250 | t2_phv
300 | t1_phv | |
350 | t1_phv | |
400 | t1_phv | 400 | t2_phv
450 | t1_phv | |
| | 75 | t2_phv
| | 225 | t2_phv
| | 325 | t2_phv
| | 475 | t2_phv
(14 rows)
RESET enable_partitionwise_join;