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postgres_fdw: Fix interaction of PHVs with child joins.
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
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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
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400 | 400
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(4 rows)
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-- with PHVs, partition-wise join selected but no join pushdown
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EXPLAIN (COSTS OFF)
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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;
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QUERY PLAN
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------------------------------------------------------------
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Sort
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Sort Key: ftprt1_p1.a, ftprt2_p1.b
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-> Result
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-> Append
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-> Hash Full Join
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Hash Cond: (ftprt1_p1.a = ftprt2_p1.b)
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-> Foreign Scan on ftprt1_p1
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-> Hash
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-> Foreign Scan on ftprt2_p1
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-> Hash Full Join
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Hash Cond: (ftprt1_p2.a = ftprt2_p2.b)
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-> Foreign Scan on ftprt1_p2
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-> Hash
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-> Foreign Scan on ftprt2_p2
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(14 rows)
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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;
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a | phv | b | phv
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-----+--------+-----+--------
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0 | t1_phv | 0 | t2_phv
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50 | t1_phv | |
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100 | t1_phv | |
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150 | t1_phv | 150 | t2_phv
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200 | t1_phv | |
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250 | t1_phv | 250 | t2_phv
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300 | t1_phv | |
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350 | t1_phv | |
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400 | t1_phv | 400 | t2_phv
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450 | t1_phv | |
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| | 75 | t2_phv
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| | 225 | t2_phv
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| | 325 | t2_phv
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| | 475 | t2_phv
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(14 rows)
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RESET enable_partitionwise_join;
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