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There were various unnecessary differences between Hash Agg's EXPLAIN ANALYZE output and Hash Join's. Here we modify the Hash Agg output so that it's better aligned to Hash Join's. The following changes have been made: 1. Start batches counter at 1 instead of 0. 2. Always display the "Batches" property, even when we didn't spill to disk. 3. Use the text "Batches" instead of "HashAgg Batches" for text format. 4. Use the text "Memory Usage" instead of "Peak Memory Usage" for text format. 5. Include "Batches" before "Memory Usage" in both text and non-text formats. In passing also modify the "Planned Partitions" property so that we show it regardless of if the value is 0 or not for non-text EXPLAIN formats. This was pointed out by Justin Pryzby and probably should have been part of 40efbf870. Reviewed-by: Justin Pryzby, Jeff Davis Discussion: https://postgr.es/m/CAApHDvrshRnA6C0VFnu7Fb9TVvgGo80PUMm5+2DiaS1gEkPvtw@mail.gmail.com Backpatch-through: 13, where HashAgg batching was introduced
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/.