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This speeds up WAL generation and replay. The new algorithm is significantly faster with large inputs, like full-page images or when inserting wide rows. It is slower with tiny inputs, i.e. less than 10 bytes or so, but the speedup with longer inputs more than make up for that. Even small WAL records at least have 24 byte header in the front. The output is identical to the current byte-at-a-time computation, so this does not affect compatibility. The new algorithm is only used for the CRC-32C variant, not the legacy version used in tsquery or the "traditional" CRC-32 used in hstore and ltree. Those are not as performance critical, and are usually only applied over small inputs, so it seems better to not carry around the extra lookup tables to speed up those rare cases. Abhijit Menon-Sen
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/.