b75fedcab7
_bt_check_compare neglected to handle a case that can arise when the scan's keys are temporarily treated as nonrequired, as an optimization: whenever a NULL tuple value was encountered that had a skip array whose current element wasn't already NULL, _bt_check_compare failed to advance the array to the NULL element. This allowed _bt_check_compare to fail to return matching tuples containing a NULL value (though only with an array column that came before a skip array column with NULLs, and only during _bt_readpage calls that set pstate.forcenonrequired=true on a page where the higher-order column also had to advance). To fix, teach _bt_check_compare to handle this case just like any other case where a skip array key is unsatisfied and must be advanced directly (due to the key being considered a nonrequired key). Oversight in commit 8a510275, which optimized nbtree search scan key comparisons with skip arrays. Author: Peter Geoghegan <pg@bowt.ie> Reported-By: Mark Dilger <mark.dilger@enterprisedb.com> Discussion: https://postgr.es/m/CAHgHdKtLFWZcjr87hMH0hYDHgcifu4Tj7iHz-xh8qsJREt5cqA@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/.