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When postgres_fdw begins an asynchronous data fetch, it submits FETCH query by using PQsendQuery(). If PQsendQuery() fails and returns 0, postgres_fdw should report an error. But, previously, postgres_fdw reported an error only when the return value is less than 0, though PQsendQuery() never return the values other than 0 and 1. Therefore postgres_fdw could not handle the failure to send FETCH query in an asynchronous data fetch. This commit fixes postgres_fdw so that it reports an error when PQsendQuery() returns 0. Back-patch to v14 where asynchronous execution was supported in postgres_fdw. Author: Fujii Masao Reviewed-by: Japin Li, Tom Lane Discussion: https://postgr.es/m/b187a7cf-d4e3-5a32-4d01-8383677797f3@oss.nttdata.com |
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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/.