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This function converts a byte position to a character position after a successful string match. Rather than calling pg_mblen() in a loop, use pg_mbstrlen_with_len() since the latter can inline its own call to pg_mblen(). When the string match is at the end of the haystack text, this change results in 10-20% performance improvement, depending on platform and typical character length in bytes. This also simplifies the code a little. Specializing for UTF-8 could result in further improvement, but the performance gain was not found to be reliable between platforms. The modest gain in this commit is stable between platforms and usable by all server encodings. Discussion: https://www.postgresql.org/message-id/CAFBsxsH1Yutrmu+6LLHKK8iXY+vG--Do6zN+2900spHXQNNQKQ@mail.gmail.com
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/.