3683af6170
Instead of laboriously computing the exact output length, use strlen to get an upper bound cheaply. (This is still O(N) of course, but the constant factor is a lot less.) This will typically result in overallocating the output datum, but that's of little concern since it's a short-lived allocation in just about all use-cases. A simple microbenchmark showed about 40% speedup for long input strings. While here, make some cosmetic cleanups and add a test case that covers the double-backslash code path in byteain and byteaout. Author: Steven Niu <niushiji@gmail.com> Reviewed-by: Kirill Reshke <reshkekirill@gmail.com> Reviewed-by: Stepan Neretin <slpmcf@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/ca315729-140b-426e-81a6-6cd5cfe7ecc5@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/.