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force_parallel_mode = regress is causing a few more problems than I thought. It seems that both the leader and the single worker can contribute to the execution. I had mistakenly thought that only the worker process would do any work. Since it's not deterministic as to which of the two processes will get a chance to work on the plan, it seems just better to disable force_parallel_mode for these tests. At least doing this seems better than changing to EXPLAIN only rather than EXPLAIN ANALYZE. Additionally, I overlooked the fact that the number of executions of the sub-plan below a Result Cache will execute a varying number of times depending on cache eviction. 32-bit machines will use less memory and evict fewer tuples from the cache. That results in the subnode being executed fewer times on 32-bit machines. Let's just blank out the number of loops in each node. |
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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/.