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Previously, Append didn't charge anything at all, and MergeAppend charged only cpu_operator_cost, about half the value used here. This change might make MergeAppend plans slightly more likely to be chosen than before, since this commit increases the assumed cost for Append -- with default values -- by 0.005 per tuple but MergeAppend by only 0.0025 per tuple. Since the comparisons required by MergeAppend are costed separately, it's not clear why MergeAppend needs to be otherwise more expensive than Append, so hopefully this is OK. Prior to partition-wise join, it didn't really matter whether or not an Append node had any cost of its own, because every plan had to use the same number of Append or MergeAppend nodes and in the same places. Only the relative cost of Append vs. MergeAppend made a difference. Now, however, it is possible to avoid some of the Append nodes using a partition-wise join, so it's worth making an effort. Pending patches for partition-wise aggregate care too, because an Append of Aggregate nodes will incur the Append overhead fewer times than an Aggregate over an Append. Although in most cases this change will favor the use of partition-wise techniques, it does the opposite when the join cardinality is greater than the sum of the input cardinalities. Since this situation arises in an existing regression test, I [rhaas] adjusted it to keep the overall plan shape approximately the same. Jeevan Chalke, per a suggestion from David Rowley. Reviewed by Ashutosh Bapat. Some changes by me. 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/CAKJS1f9UXdk6ZYyqbJnjFO9a9hyHKGW7B=ZRh-rxy9qxfPA5Gw@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/.