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Base de données relationnelle
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A new test case from Andreas Seltenreich showed that we were still a bit confused about removing PlaceHolderVars during join removal. Specifically, remove_rel_from_query would remove a PHV that was used only underneath the removable join, even if the place where it's used was the join partner relation and not the join clause being deleted. This would lead to a "too late to create a new PlaceHolderInfo" error later on. We can defend against that by checking ph_eval_at to see if the PHV could possibly be getting used at some partner rel. Also improve some nearby LATERAL-related logic. I decided that the check on ph_lateral needed to take precedence over the check on ph_needed, in case there's a lateral reference underneath the join being considered. (That may be impossible, but I'm not convinced of it, and it's easy enough to defend against the case.) Also, I realized that remove_rel_from_query's logic for updating LateralJoinInfos is dead code, because we don't build those at all until after join removal. Back-patch to 9.3. Previous versions didn't have the LATERAL issues, of course, and they also didn't attempt to remove PlaceHolderInfos during join removal. (I'm starting to wonder if changing that was really such a great idea.) |
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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: 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/.