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Per the discussion in optimizer/README, it's unsafe to reassociate anything into or out of the RHS of a SEMI or ANTI join. An example from Piotr Stefaniak showed that join_is_legal() wasn't sufficiently enforcing this rule, so lock it down a little harder. I couldn't find a reasonably simple example of the optimizer trying to do this, so no new regression test. (Piotr's example involved the random search in GEQO accidentally trying an invalid case and triggering a sanity check way downstream in clause selectivity estimation, which did not seem like a sequence of events that would be useful to memorialize in a regression test as-is.) Back-patch to all active branches.
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/.