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4f658dc851
The immediate impetus for this is that Noah Misch's patch to elide unnecessary table and index rebuilds when changing typmod for temporal types uses it; and this is extracted from that patch, with some further commentary by me. But it seems logically separate from the remainder of the patch, so I'm committing it separately; this is not the first time someone has wanted fls() in the backend and probably won't be the last. If we end up using this in more performance-critical spots it may be worthwhile to add some architecture-specific optimizations to our src/port version of fls() - e.g. any x86 platform can implement this using the assembly instruction BSRL. But performance won't matter a bit for assessing typmod changes, so I'm not worried about that right now. |
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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/.