4c08ecd161
Previously, we asserted that the eager scan's success and failure counters were positive before decrementing them. However, this assumption was incorrect, as it's possible that some blocks have already been eagerly scanned by the time eager scanning is disabled. This commit replaces the assertions with guards to handle this scenario gracefully. With this change, we continue to allow read-ahead operations by the read stream that exceed the success and failure caps. While there is a possibility that overruns will trigger eager scans of additional pages, this does not pose a practical concern as the overruns will not be substantial and remain within an acceptable range. Reviewed-by: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/CAD21AoConf6tkVCv-=JhQJj56kYsDwo4jG5+WqgT+ukSkYomSQ@mail.gmail.com
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/.