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This commit extends the postgres_fdw_get_connections() function to check if connections are closed. This is useful for detecting closed postgres_fdw connections that could prevent successful transaction commits. Users can roll back transactions immediately upon detecting closed connections, avoiding unnecessary processing of failed transactions. This feature is available only on systems supporting the non-standard POLLRDHUP extension to the poll system call, including Linux. Author: Hayato Kuroda Reviewed-by: Shinya Kato, Zhihong Yu, Kyotaro Horiguchi, Andres Freund Reviewed-by: Onder Kalaci, Takamichi Osumi, Vignesh C, Tom Lane, Ted Yu Reviewed-by: Katsuragi Yuta, Peter Smith, Shubham Khanna, Fujii Masao Discussion: https://postgr.es/m/TYAPR01MB58662809E678253B90E82CE5F5889@TYAPR01MB5866.jpnprd01.prod.outlook.com