bfe21b760e
Previously, only btrees were supported as the referenced unique index for foreign keys because there was no way to get the equality strategy number for other index methods. We have this now (commit c09e5a6a016), so we can support this. In fact, this is now just a special case of the existing generalized "period" foreign key support, since that already knows how to lookup equality strategy numbers. Note that this does not change the requirement that the referenced index needs to be unique, and at the moment, only btree supports that, so this does not change anything in practice, but it would allow another index method that has amcanunique to be supported. Co-authored-by: Mark Dilger <mark.dilger@enterprisedb.com> Discussion: https://www.postgresql.org/message-id/flat/E72EAA49-354D-4C2E-8EB9-255197F55330@enterprisedb.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/.