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Base de données relationnelle
bab4f7fa56
rel_is_distinct_for()'s RTE_SUBQUERY branch passed only the equality operator from each join clause to query_is_distinct_for(), discarding the operator's input collation. query_is_distinct_for() then verified opfamily compatibility but never checked collations, so a DISTINCT / GROUP BY / set-op operating under one collation was trusted to prove uniqueness for a comparison performed under an unrelated collation. As with the recent fix in relation_has_unique_index_for(), this is unsound for nondeterministic collations and yields wrong query results in any optimization that consumes the proof. Fix by carrying each clause's operator input collation into query_is_distinct_for() and validating it at every check-site against the subquery target expression's collation. Back-patch to all supported branches. query_is_distinct_for() is declared in an installed header, so on stable branches the existing two-list signature is retained as a thin wrapper that forwards to a new collation-aware entry point; external callers continue to receive the historical collation-blind answer. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAMbWs4_XUUSTyzCaRjUeeahWNqi=8ZOA5Q4coi8zUVEDSBkM6A@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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.