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* Move the execution pruning initialization steps that are common between both ExecInitAppend() and ExecInitMergeAppend() into a new function ExecInitPartitionPruning() defined in execPartition.c. Those steps include creation of a PartitionPruneState to be used for all instances of pruning and determining the minimal set of child subplans that need to be initialized by performing initial pruning if needed, and finally adjusting the subplan_map arrays in the PartitionPruneState to reflect the new set of subplans remaining after initial pruning if it was indeed performed. ExecCreatePartitionPruneState() is no longer exported out of execPartition.c and has been renamed to CreatePartitionPruneState() as a local sub-routine of ExecInitPartitionPruning(). * Likewise, ExecFindInitialMatchingSubPlans() that was in charge of performing initial pruning no longer needs to be exported. In fact, since it would now have the same body as the more generally named ExecFindMatchingSubPlans(), except differing in the value of initial_prune passed to the common subroutine find_matching_subplans_recurse(), it seems better to remove it and add an initial_prune argument to ExecFindMatchingSubPlans(). * Add an ExprContext field to PartitionPruneContext to remove the implicit assumption in the runtime pruning code that the ExprContext to use to compute pruning expressions that need one can always rely on the PlanState providing it. A future patch will allow runtime pruning (at least the initial pruning steps) to be performed without the corresponding PlanState yet having been created, so this will help. Author: Amit Langote <amitlangote09@gmail.com> Discussion: https://postgr.es/m/CA+HiwqEYCpEqh2LMDOp9mT+4-QoVe8HgFMKBjntEMCTZLpcCCA@mail.gmail.com
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/.