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If we apply outer join identity 3 when relation C is a subquery having lateral references to relation B, then the lateral references within C continue to bear the original syntactically-correct varnullingrels marks, but that won't match what is available from the outer side of the nestloop. Compensate for that in process_subquery_nestloop_params(). This is a slightly hacky fix, but we certainly don't want to re-plan C in toto for each possible outer join order, so there's not a lot of better alternatives. Richard Guo and Tom Lane, per report from Markus Winand Discussion: https://postgr.es/m/DFBB2D25-DE97-49CA-A60E-07C881EA59A7@winand.at |
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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/.