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Commit 32a9c0bdf introduced connection retry logic into postgres_fdw. Previously it used goto statement for retry. This commit gets rid of that goto from the logic to make the code simpler and easier-to-read. When getting out of PG_CATCH() for the retry, the error state should be cleaned up and the memory context should be reset. But commit 32a9c0bdf forgot to do that. This commit also fixes this bug. Previously only PQstatus()==CONNECTION_BAD was verified to detect connection failure. But this could cause false detection in the case where any error other than connection failure (e.g., out-of-memory) was thrown after a broken connection was detected in libpq and CONNECTION_BAD is set. To fix this issue, this commit changes the logic so that it also checks the error's sqlstate is ERRCODE_CONNECTION_FAILURE. Author: Fujii Masao Reviewed-by: Tom Lane Discussion: https://postgr.es/m/2943611.1602375376@sss.pgh.pa.us
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.