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This is essential information when looking at an index that has "included" columns. Per discussion, follow the style used in \dC and some other places: column header is "Key?" and values are "yes" or "no" (all translatable). While at it, revise describeOneTableDetails to be a bit more maintainable: avoid hard-wired column numbers and multiple repetitions of what needs to be identical test logic. This also results in the emitted catalog query corresponding more closely to what we print, which should be a benefit to users of ECHO_HIDDEN mode, and perhaps a bit faster too (the old logic sometimes asked for values it would not print, even ones that are fairly expensive to get). Discussion: https://postgr.es/m/21724.1531943735@sss.pgh.pa.us
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/.