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The option --compress is extended to accept a compression method and an optional compression level, as of the grammar METHOD[:LEVEL]. The methods currently support are "none" and "gzip", for client-side compression. Any of those methods use only an integer value for the compression level, but any method implemented in the future could use more specific keywords if necessary. This commit keeps the logic backward-compatible. Hence, the following compatibility rules apply for the new format of the option --compress: * -z/--gzip is a synonym of --compress=gzip. * --compress=NUM implies: ** --compress=none if NUM = 0. ** --compress=gzip:NUM if NUM > 0. Note that there are also plans to extend more this grammar with server-side compression. Reviewed-by: Robert Haas, Magnus Hagander, Álvaro Herrera, David G. Johnston, Georgios Kokolatos Discussion: https://postgr.es/m/Yb3GEgWwcu4wZDuA@paquier.xyz
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/.