ca6fde9225
Here we adjust escape_json_with_len() to make use of SIMD to allow processing of up to 16-bytes at a time rather than processing a single byte at a time. This has been shown to speed up escaping of JSON strings significantly. Escaping is required for both JSON string properties and also the property names themselves, so this should also help improve the speed of the conversion from JSON into text for JSON objects that have property names 16 or more bytes long. Escaping JSON strings was often a significant bottleneck for longer strings. With these changes, some benchmarking has shown a query performing nearly 4 times faster when escaping a JSON object with a 1MB text property. Tests with shorter text properties saw smaller but still significant performance improvements. For example, a test outputting 1024 JSON strings with a text property length ranging from 1 char to 1024 chars became around 2 times faster. Author: David Rowley Reviewed-by: Melih Mutlu Discussion: https://postgr.es/m/CAApHDvpLXwMZvbCKcdGfU9XQjGCDm7tFpRdTXuB9PVgpNUYfEQ@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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.