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We have implemented jsonpath string comparison using default database locale. However, standard requires us to compare Unicode codepoints. This commit implements that, but for performance reasons we still use per-byte comparison for "==" operator. Thus, for consistency other comparison operators do per-byte comparison if Unicode codepoints appear to be equal. In some edge cases, when same Unicode codepoints have different binary representations in database encoding, we diverge standard to achieve better performance of "==" operator. In future to implement strict standard conformance, we can do normalization of input JSON strings. Original patch was written by Nikita Glukhov, rewritten by me. Reported-by: Markus Winand Discussion: https://postgr.es/m/8B7FA3B4-328D-43D7-95A8-37B8891B8C78%40winand.at Author: Nikita Glukhov, Alexander Korotkov Backpatch-through: 12
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/.