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Amit Langote reported that partition prune was unable to work with arrays, enums, etc, which led him to research the appropriate way to match query clauses to partition keys: instead of searching for an exact match of the expression's type, it is better to rely on the fact that the expression qual has already been resolved to a specific operator, and that the partition key is linked to a specific operator family. With that info, it's possible to figure out the strategy and comparison function to use for the pruning clause in a manner that works reliably for pseudo-types also. Include new test cases that demonstrate pruning where pseudotypes are involved. Author: Amit Langote, Álvaro Herrera Discussion: https://postgr.es/m/2b02f1e9-9812-9c41-972d-517bdc0f815d@lab.ntt.co.jp
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.