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Commit fede15417 introduced FILTER by jamming it into the existing example introducing HAVING, which seems pedagogically poor to me; and it added no information about what the keyword actually does. Not to mention that the claimed output didn't match the sample data being used in this running example. Revert that and instead make an independent example using FILTER. To help drive home the point that it's a per-aggregate filter, we need to use two aggregates not just one; for consistency expand all the examples in this segment to do that. Also adjust the example using WHERE ... LIKE so that it'd produce nonempty output with this sample data, and show that output. Back-patch, as the previous patch was. (Sadly, v10 is now out of scope.) Discussion: https://postgr.es/m/166794307526.652.9073408178177444190@wrigleys.postgresql.org
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/.