749f4ce4d9
On the CREATE POLICY page, the "Policies Applied by Command Type" table was missing MERGE ... THEN DELETE and some of the policies applied during INSERT ... ON CONFLICT and MERGE. Fix that, and try to improve readability by listing the various MERGE cases separately, rather than together with INSERT/UPDATE/DELETE. Mention COPY ... TO along with SELECT, since it behaves in the same way. In addition, document which policy violations cause errors to be thrown, and which just cause rows to be silently ignored. Also, a paragraph above the table states that INSERT ... ON CONFLICT DO UPDATE only checks the WITH CHECK expressions of INSERT policies for rows appended to the relation by the INSERT path, which is incorrect -- all rows proposed for insertion are checked, regardless of whether they end up being inserted. Fix that, and also mention that the same applies to INSERT ... ON CONFLICT DO NOTHING. In addition, in various other places on that page, clarify how the different types of policy are applied to different commands, and whether or not errors are thrown when policy checks do not pass. Backpatch to all supported versions. Prior to v17, MERGE did not support RETURNING, and so MERGE ... THEN INSERT would never check new rows against SELECT policies. Prior to v15, MERGE was not supported at all. Author: Dean Rasheed <dean.a.rasheed@gmail.com> Reviewed-by: Viktor Holmberg <v@viktorh.net> Reviewed-by: Jian He <jian.universality@gmail.com> Discussion: https://postgr.es/m/CAEZATCWqnfeChjK=n1V_dYZT4rt4mnq+ybf9c0qXDYTVMsy8pg@mail.gmail.com Backpatch-through: 14 |
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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/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/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/.