ec986020de
Move nbtree's detection of RowCompare quals that are unsatisfiable due to having a NULL in their first row element: rather than detecting these cases at the point where _bt_first builds its insertion scan key, do so earlier, during preprocessing proper. This brings the RowCompare case in line every other case involving an unsatisfiable-due-to-NULL qual. nbtree now consistently detects such unsatisfiable quals -- even when they happen to involve a key that isn't examined by _bt_first at all. Affected cases thereby avoid useless full index scans that cannot possibly return any matching rows. Author: Peter Geoghegan <pg@bowt.ie> Reviewed-By: Matthias van de Meent <boekewurm+postgres@gmail.com> Discussion: https://postgr.es/m/CAH2-WzmySVXst2hFrOATC-zw1Byg1XC-jYUS314=mzuqsNwk+Q@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.
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