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Base de données relationnelle
3bf05e096b
Up until now, we've abused grouped_rel->partial_pathlist as a place to store partial paths that have been partially aggregate, but that's really not correct, because a partial path for a relation is supposed to be one which produces the correct results with the addition of only a Gather or Gather Merge node, and these paths also require a Finalize Aggregate step. Instead, add a new partially_group_rel which can hold either partial paths (which need to be gathered and then have aggregation finalized) or non-partial paths (which only need to have aggregation finalized). This allows us to reuse generate_gather_paths for partially_grouped_rel instead of writing new code, so that this patch actually basically no net new code while making things cleaner, simplifying things for pending patches for partition-wise aggregate. Robert Haas and Jeevan Chalke. The larger patch series of which this patch is a part was also reviewed and tested by Antonin Houska, Rajkumar Raghuwanshi, David Rowley, Dilip Kumar, Konstantin Knizhnik, Pascal Legrand, Rafia Sabih, and me. Discussion: http://postgr.es/m/CA+TgmobrzFYS3+U8a_BCy3-hOvh5UyJbC18rEcYehxhpw5=ETA@mail.gmail.com Discussion: http://postgr.es/m/CA+TgmoZyQEjdBNuoG9-wC5GQ5GrO4544Myo13dVptvx+uLg9uQ@mail.gmail.com |
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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/.