7dadd38cda
This introduces the JSON format option for the COPY TO command, allowing users to export query results or table data directly as a stream of JSON objects (one per line, NDJSON style). The JSON format is currently supported only for COPY TO operations; it is not available for COPY FROM. JSON format is incompatible with some standard text/CSV formatting options, including HEADER, DEFAULT, NULL, DELIMITER, FORCE QUOTE, FORCE NOT NULL, and FORCE NULL. Column list support is included: when a column list is specified, only the named columns are emitted in each JSON object. Regression tests covering valid JSON exports and error handling for incompatible options have been added to src/test/regress/sql/copy.sql. Author: Joe Conway <mail@joeconway.com> Author: jian he <jian.universality@gmail.com> Co-Authored-By: Andrew Dunstan <andrew@dunslane.net> Reviewed-by: Andrey M. Borodin <x4mmm@yandex-team.ru> Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com> Reviewed-by: Daniel Verite <daniel@manitou-mail.org> Reviewed-by: Davin Shearer <davin@apache.org> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Discussion: https://postgr.es/m/CALvfUkBxTYy5uWPFVwpk_7ii2zgT07t3d-yR_cy4sfrrLU%3Dkcg%40mail.gmail.com Discussion: https://postgr.es/m/6a04628d-0d53-41d9-9e35-5a8dc302c34c@joeconway.com |
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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/.