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Once upon a time it was necessary for grouping_planner() to determine the tlist it wanted from the scan/join plan subtree before it called query_planner(), because query_planner() would actually make a Plan using that. But we refactored things a long time ago to delay construction of the Plan tree till later, so there's no need to build that tlist until (and indeed unless) we're ready to plaster it onto the Plan. The only thing query_planner() cares about is what Vars are going to be needed for the tlist, and it can perfectly well get that by looking at the real tlist rather than some masticated version. Well, actually, there is one minor glitch in that argument, which is that make_subplanTargetList also adds Vars appearing only in HAVING to the tlist it produces. So now we have to account for HAVING explicitly in build_base_rel_tlists. But that just adds a few lines of code, and I doubt it moves the needle much on processing time; we might be doing pull_var_clause() twice on the havingQual, but before we had it scanning dummy tlist entries instead. This is a very small down payment on rationalizing grouping_planner enough so it can be refactored. |
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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/.