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It's against project policy to use elog() for user-facing errors, or to omit an errcode() selection for errors that aren't supposed to be "can't happen" cases. Fix all the violations of this policy that result in ERRCODE_INTERNAL_ERROR log entries during the standard regression tests, as errors that can reliably be triggered from SQL surely should be considered user-facing. I also looked through all the files touched by this commit and fixed other nearby problems of the same ilk. I do not claim to have fixed all violations of the policy, just the ones in these files. In a few places I also changed existing ERRCODE choices that didn't seem particularly appropriate; mainly replacing ERRCODE_SYNTAX_ERROR by something more specific. Back-patch to 9.5, but no further; changing ERRCODE assignments in stable branches doesn't seem like a good idea.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.