796962922e
A recently added nbtree preprocessing step failed to account for the fact that DESC columns already had their B-Tree strategy number commuted at this point in preprocessing. As a result, preprocessing could output a set of scan keys where one or more keys had the correct strategy number, but used the wrong comparison routine. To fix, make the faulty code path that looks up a more restrictive replacement operator/comparison routine commute its requested inequality strategy (while outputting the transformed strategy number as before). This makes the final transformed scan key comport with the approach preprocessing has always used to deal with DESC columns (which is described by comments above _bt_fix_scankey_strategy). Oversight in commit commit b3f1a13f, which made nbtree preprocessing perform transformations on skip array inequalities that can reduce the total number of index searches. Author: Peter Geoghegan <pg@bowt.ie> Reported-By: Natalya Aksman <natalya@timescale.com> Discussion: https://postgr.es/m/19049-b7df801e71de41b2@postgresql.org Backpatch-through: 18
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.
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