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51c0f63e4d
Refactor so that the internal APIs in planner.c deal in PathTargets not targetlists, and establish a more regular structure for deriving the targets needed for successive steps. There is more that could be done here; calculating the eval costs of each successive target independently is both inefficient and wrong in detail, since we won't actually recompute values available from the input node's tlist. But it's no worse than what happened before the pathification rewrite. In any case this seems like a good starting point for considering how to handle Konstantin Knizhnik's function-evaluation-postponement patch. |
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README.git |
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/.