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The RI fast-path check probes the referenced index directly and, for single-column keys, uses SK_SEARCHARRAY. Both assume the index is a btree. A comment claimed "PK indexes are always btree", but a foreign key's referenced index need not be a primary key: transformFkeyCheckAttrs() accepts any unique (or, for temporal keys, exclusion) index, so an out-of-tree access method advertising amcanunique could supply a non-btree index reachable by the fast path. Add pk_index_is_btree to RI_ConstraintInfo, set from the referenced index's access method when the constraint is loaded, and make ri_fastpath_is_applicable() return false for non-btree indexes so such constraints fall back to the SPI path. Reported-by: Noah Misch <noah@leadboat.com> Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Discussion: https://postgr.es/m/20260705210533.ee.noahmisch@microsoft.com Backpatch-through: 19
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/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/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/.