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Pull up ANY-SUBLINK with the necessary lateral support.

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For ANY-SUBLINK, we adopted a two-stage pull-up approach to handle
different types of scenarios. In the first stage, the sublink is pulled up
as a subquery. Because of this, when writing this code, we did not have
the ability to perform lateral joins, and therefore, we were unable to
pull up Var with varlevelsup=1. Now that we have the ability to use
lateral joins, we can eliminate this limitation.

Author: Andy Fan <zhihui.fan1213@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Richard Guo <guofenglinux@gmail.com>
Reviewed-by: Alena Rybakina <lena.ribackina@yandex.ru>
Reviewed-by: Andrey Lepikhov <a.lepikhov@postgrespro.ru>
This commit is contained in:
Alexander Korotkov
2024-02-15 12:05:52 +02:00
parent 995d400cec
commit 9f13376396
7 changed files with 192 additions and 20 deletions
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6
contrib/postgres_fdw/expected/postgres_fdw.out
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@ -11894,7 +11894,7 @@ CREATE FOREIGN TABLE foreign_tbl (b int)
CREATE FOREIGN TABLE foreign_tbl2 () INHERITS (foreign_tbl)
SERVER loopback OPTIONS (table_name 'base_tbl');
EXPLAIN (VERBOSE, COSTS OFF)
SELECT a FROM base_tbl WHERE a IN (SELECT a FROM foreign_tbl);
SELECT a FROM base_tbl WHERE (a, random() > 0) IN (SELECT a, random() > 0 FROM foreign_tbl);
QUERY PLAN
-----------------------------------------------------------------------------
Seq Scan on public.base_tbl
@ -11902,7 +11902,7 @@ SELECT a FROM base_tbl WHERE a IN (SELECT a FROM foreign_tbl);
Filter: (SubPlan 1)
SubPlan 1
-> Result
Output: base_tbl.a
Output: base_tbl.a, (random() > '0'::double precision)
-> Append
-> Async Foreign Scan on public.foreign_tbl foreign_tbl_1
Remote SQL: SELECT NULL FROM public.base_tbl
@ -11910,7 +11910,7 @@ SELECT a FROM base_tbl WHERE a IN (SELECT a FROM foreign_tbl);
Remote SQL: SELECT NULL FROM public.base_tbl
(11 rows)
SELECT a FROM base_tbl WHERE a IN (SELECT a FROM foreign_tbl);
SELECT a FROM base_tbl WHERE (a, random() > 0) IN (SELECT a, random() > 0 FROM foreign_tbl);
a
---
1