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The fast path probes using the referenced index's collation. When that collation differs from the referenced column's, it can reject valid references or accept invalid ones. Changing the scan key's collation is not sufficient, since btree navigation must use the ordering under which the index was built. Cache index eligibility lazily after locking the referenced table, reloading the constraint information, and opening the index. Compare index and column collations using the held relation descriptors, and fall back to SPI on a mismatch. Also move the btree eligibility check here, avoiding a lookup of an index that REINDEX CONCURRENTLY could drop before the referenced-table lock is acquired. Cache both acceptance and rejection until the constraint information is reloaded, so subsequent rows need not repeat the comparisons. Check before probing or buffering any row. If batch entry initialization rejects the index, remove that entry while preserving any other pending checks. Add ICU regression coverage for per-row validation, ordinary inserts, reordered index columns, both directions of collation mismatch, and fallback while another foreign key check is pending. Reported-by: Amit Kapila <amit.kapila16@gmail.com> Discussion: https://postgr.es/m/CAA4eK1Lk1DfgiFPL-HccZm-Nm+exg+FcsODH8KPw6BOBuzfHtA@mail.gmail.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/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/.