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postgres_fdw: Fix interaction of PHVs with child joins.

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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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5
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -1913,4 +1913,9 @@ EXPLAIN (COSTS OFF)
SELECT t1.a,t1.b FROM fprt1 t1, LATERAL (SELECT t2.a, t2.b FROM fprt2 t2 WHERE t1.a = t2.b AND t1.b = t2.a) q WHERE t1.a%25 = 0 ORDER BY 1,2;
SELECT t1.a,t1.b FROM fprt1 t1, LATERAL (SELECT t2.a, t2.b FROM fprt2 t2 WHERE t1.a = t2.b AND t1.b = t2.a) q WHERE t1.a%25 = 0 ORDER BY 1,2;
-- 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;
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;
RESET enable_partitionwise_join;