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nbtree array index scans could fail to return matching tuples in rare cases where the missed tuples cover key space that the scan's arrays incorrectly indicate has already been read. These cases involved nearby tuples with NULL values that were evaluated using a skip array key while in pstate.forcenonrequired mode. To fix, prevent forcenonrequired mode from prematurely advancing the scan's array keys beyond key space that the scan has yet to read tuples from: reset the scan's array keys (to the first elements in the current scan direction) before the _bt_checkkeys call for pstate.finaltup. That way _bt_checkkeys starts from a clean slate, which ensures that it will call _bt_advance_array_keys (while passing it sktrig_required=true). This reliably restores the invariant that the scan's arrays always accurately track its progress through the index's key space (at least when the scan is "between pages"). Oversight in commit 8a510275, which optimized nbtree search scan key comparisons. Author: Peter Geoghegan <pg@bowt.ie> Reviewed-By: Mark Dilger <mark.dilger@enterprisedb.com> Discussion: https://postgr.es/m/CAH2-WzmodSE+gpTd1CRGU9ez8ytyyDS+Kns2r9NzgUp1s56kpw@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/.