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When an error is raised while processing a Sync message in a pipeline, like a deferred constraint violation, the error was not associated with the piped command and was not counted in available_results. This caused assertion failures in discardAbortedPipelineResults(), keeping an incorrect state at pipeline exit, because the code assumed that the number of available and requested results would always be positive, expecting all the counters to be 0 at the end of a pipeline. This commit switches discardAbortedPipelineResults() and ExecQueryAndProcessResults() to take a softer approach when consuming and draining the results after an error. If there are still piped syncs in the pipeline when it ends, we now attempt to consume them before leaving the pipeline mode. Alexander has been able to reach two assertion failures through his testing. While investigating more this issue, I have bumped into two more. Most of these cases are covered by the regression tests added in this commit, plus some cases with mixes of pipelines, deferred errors and results fetched. Some of the tests discussed (like the backend termination one) could not be included in this commit but have been tested manually. Another test scenario discussed involved the injection of an error state in the backend, that was able to trick libpq internally and put its queue out of sync. This scenario is not going to happen in practice, but if we were to do something about it we would need to make libpq understand that it needs to fail in some cases but not block. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/19494-97a86d84fee71c47@postgresql.org Backpatch-through: 18 |
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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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.