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The initial version of the included-index-column feature stated that included columns couldn't be the same as any key column of the index. While it'd be pretty silly to do that, since the included column would be entirely redundant, we've never prohibited redundant index columns before so it's not very consistent to do so here. Moreover, the prohibition was itself badly implemented, so that it failed to reject columns that were effectively identical but not spelled quite alike, as reported by Aditya Toshniwal. (Moreover, it's not hard to imagine that for some non-btree index types, such cases would be non-silly anyhow: the index might use a lossy representation for key columns but be able to support retrieval of the original form of included columns.) Hence, let's just drop the prohibition. In passing, do some copy-editing on the documentation for the included-column feature. Yugo Nagata; documentation and test corrections by me Discussion: https://postgr.es/m/CAM9w-_mhBCys4fQNfaiQKTRrVWtoFrZ-wXmDuE9Nj5y-Y7aDKQ@mail.gmail.com |
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README
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/.