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The only remaining places where we actually look at CTimeZone/HasCTZSet are abstime2tm() and timestamp2tm(). Now that session_timezone is always valid, we can remove these special cases. The caller-visible impact of this is that these functions now always return a valid zone abbreviation if requested, whereas before they'd return a NULL pointer if a brute-force timezone was in use. In the existing code, the only place I can find that changes behavior is to_char(), whose TZ format code will now print something useful rather than nothing for such zones. (In the places where the returned zone abbreviation is passed to EncodeDateTime, the lack of visible change is because we've chosen the abbreviation used for these zones to match what EncodeTimezone would have printed.) It's likely that there is now a fair amount of removable dead code around the call sites, namely anything that's meant to cope with getting a NULL timezone abbreviation, but I've not made an effort to root that out. This could be back-patched if we decide we'd like to fix to_char()'s behavior in the back branches, but there doesn't seem to be much enthusiasm for that at present. |
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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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.