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When a Gather or Gather Merge node is rescanned, it starts a new set of workers, which write their Memoize stats into the same shared memory slots as the previous worker. ExecEndMemoize() used memcpy() for this, so EXPLAIN ANALYZE showed only the stats for the final scan. Here we adjust ExecEndMemoize() to accumulate the counters so that we gather up the totals over all rescans. Author: Tatsuya Kawata <kawatatatsuya0913@gmail.com> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/CAHza6qeA-4vB355co-2yAxDMRTpEneY0rg9CD2zMLYscYvv2UA@mail.gmail.com Backpatch-through: 14
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/.