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consider_parallel_nestloop passed the wrong jointype down to its subroutines for JOIN_UNIQUE_INNER cases (it should pass JOIN_INNER), and it thought that it could pass paths other than innerrel->cheapest_total_path to create_unique_path, which create_unique_path is not on board with. These bugs would lead to assertion failures or other errors, suggesting that this code path hasn't been tested much. hash_inner_and_outer's code for parallel join effectively treated both JOIN_UNIQUE_OUTER and JOIN_UNIQUE_INNER the same as JOIN_INNER (for different reasons :-(), leading to incorrect plans that treated a semijoin as if it were a plain join. Michael Day submitted a test case demonstrating that hash_inner_and_outer failed for JOIN_UNIQUE_OUTER, and I found the other cases through code review. Report: https://postgr.es/m/D0E8A029-D1AC-42E8-979A-5DE4A77E4413@rcmail.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. 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/.