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postgres_fdw: Add "used_in_xact" column to postgres_fdw_get_connections().

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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
This commit is contained in:
Fujii Masao
2024-07-26 22:15:51 +09:00
parent 5687f8c0dd
commit c297a47c5f
7 changed files with 112 additions and 20 deletions
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16
contrib/postgres_fdw/postgres_fdw--1.1--1.2.sql Normal file
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/* contrib/postgres_fdw/postgres_fdw--1.1--1.2.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION postgres_fdw UPDATE TO '1.2'" to load this file. \quit
/* First we have to remove it from the extension */
ALTER EXTENSION postgres_fdw DROP FUNCTION postgres_fdw_get_connections ();
/* Then we can drop it */
DROP FUNCTION postgres_fdw_get_connections ();
CREATE FUNCTION postgres_fdw_get_connections (OUT server_name text,
OUT valid boolean, OUT used_in_xact boolean)
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'postgres_fdw_get_connections_1_2'
LANGUAGE C STRICT PARALLEL RESTRICTED;