postgres_fdw: Add "used_in_xact" column to postgres_fdw_get_connections().
commitc297a47c5f8da78d976e8c3f790dbeeb6a21a853
authorFujii Masao <fujii@postgresql.org>
Fri, 26 Jul 2024 13:15:51 +0000 (26 22:15 +0900)
committerFujii Masao <fujii@postgresql.org>
Fri, 26 Jul 2024 13:15:51 +0000 (26 22:15 +0900)
tree46df1a1f4a115f6dd82ff15e21e096489695b09f
parent5687f8c0dd766acb15587a0af8b5208aa3841b21
postgres_fdw: Add "used_in_xact" column to postgres_fdw_get_connections().

This commit extends the postgres_fdw_get_connections() function to
include a new used_in_xact column, indicating whether each connection
is used in the current transaction.

This addition is particularly useful for the upcoming feature that
will check if connections are closed. By using those information,
users can verify if postgres_fdw connections used in a transaction
remain open. If any connection is closed, the transaction cannot
be committed successfully. In this case users can roll back it
immediately without waiting for transaction end.

The SQL API for postgres_fdw_get_connections() is updated by
this commit and may change in the future. To handle compatibility
with older SQL declarations, an API versioning system is introduced,
allowing the function to behave differently based on the API version.

Author: Hayato Kuroda
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/be9382f7-5072-4760-8b3f-31d6dffa8d62@oss.nttdata.com
contrib/postgres_fdw/Makefile
contrib/postgres_fdw/connection.c
contrib/postgres_fdw/expected/postgres_fdw.out
contrib/postgres_fdw/meson.build
contrib/postgres_fdw/postgres_fdw--1.1--1.2.sql [new file with mode: 0644]
contrib/postgres_fdw/postgres_fdw.control
doc/src/sgml/postgres-fdw.sgml