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postgresql/contrib/postgres_fdw
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Etsuro Fujita 269e2c3916 postgres_fdw: Refuse to send FETCH FIRST WITH TIES to remote servers. 
Previously, when considering LIMIT pushdown, postgres_fdw failed to
check whether the query has this clause, which led to pushing false
LIMIT clauses, causing incorrect results.

This clause has been supported since v13, so we need to do a
remote-version check before deciding that it will be safe to push such a
clause, but we do not currently have a way to do the check (without
accessing the remote server); disable pushing such a clause for now.

Oversight in commit 357889eb1.  Back-patch to v13, where that commit
added the support.

Per bug #18467 from Onder Kalaci.

Patch by Japin Li, per a suggestion from Tom Lane, with some changes to
the comments by me.  Review by Onder Kalaci, Alvaro Herrera, and me.

Discussion: https://postgr.es/m/18467-7bb89084ff03a08d%40postgresql.org
2024-06-07 17:45:06 +09:00
..
expected postgres_fdw: Refuse to send FETCH FIRST WITH TIES to remote servers. 2024-06-07 17:45:06 +09:00
sql postgres_fdw: Refuse to send FETCH FIRST WITH TIES to remote servers. 2024-06-07 17:45:06 +09:00
.gitignore Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
connection.c Make postgres_fdw request remote time zone 'GMT' not 'UTC'. 2024-04-21 13:46:20 -04:00
deparse.c Fix deparsing of Consts in postgres_fdw ORDER BY 2024-03-11 12:28:40 +13:00
Makefile postgres_fdw: Add function to list cached connections to foreign servers. 2021-01-18 15:11:08 +09:00
option.c Avoid using ambiguous word "non-negative" in error messages. 2021-07-28 01:21:35 +09:00
postgres_fdw--1.0--1.1.sql postgres_fdw: Add functions to discard cached connections. 2021-01-26 15:35:54 +09:00
postgres_fdw--1.0.sql Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
postgres_fdw.c postgres_fdw: Refuse to send FETCH FIRST WITH TIES to remote servers. 2024-06-07 17:45:06 +09:00
postgres_fdw.control postgres_fdw: Add function to list cached connections to foreign servers. 2021-01-18 15:11:08 +09:00
postgres_fdw.h Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:24 -04:00
shippable.c Replace remaining uses of "whitelist". 2021-01-05 14:00:16 +13:00