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pgbench uses readCommandResponse() to process server responses. When readCommandResponse() encounters an error during a call to PQgetResult() to fetch the current result, it attempts to report it with an additional error message from PQerrorMessage(). However, previously, this extra error message could be lost or become incorrect. The cause was that after fetching the current result (and detecting an error), readCommandResponse() called PQgetResult() again to peek at the next result. This second call could overwrite the libpq connection's error message before the original error was reported, causing the error message retrieved from PQerrorMessage() to be lost or overwritten. This commit fixes the issue by updating readCommandResponse() to use PQresultErrorMessage() instead of PQerrorMessage() to retrieve the error message generated when the PQgetResult() for the current result causes an error, ensuring the correct message is reported. Backpatch to all supported versions. Author: Yugo Nagata <nagata@sraoss.co.jp> Reviewed-by: Chao Li <lic@highgo.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/20250925110940.ebacc31725758ec47d5432c6@sraoss.co.jp Backpatch-through: 13 |
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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/.