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The inner-unique patch (commit 9c7f5229a) supposed that if we're considering a JOIN_UNIQUE_INNER join path, we can always set inner_unique for the join, because the inner path produced by create_unique_path should be unique relative to the outer relation. However, that's true only if we're considering joining to the whole outer relation --- otherwise we may be applying only some of the join quals, and so the inner path might be non-unique from the perspective of this join. Adjust the test to only believe that we can set inner_unique if we have the whole semijoin LHS on the outer side. There is more that can be done in this area, but this commit is only intended to provide the minimal fix needed to get correct plans. Per report from Teodor Sigaev. Thanks to David Rowley for preliminary investigation. Discussion: https://postgr.es/m/f994fc98-389f-4a46-d1bc-c42e05cb43ed@sigaev.ru
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.