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bb3ec16e14
This moves PartitionPruneInfo from plan nodes to PlannedStmt, simplifying traversal by centralizing all PartitionPruneInfo structures in a single list in it, which holds all instances for the main query and its subqueries. Instead of plan nodes (Append or MergeAppend) storing PartitionPruneInfo pointers, they now reference an index in this list. A bitmapset field is added to PartitionPruneInfo to store the RT indexes corresponding to the apprelids field in Append or MergeAppend. This allows execution pruning logic to verify that it operates on the correct plan node, mainly to facilitate debugging. Duplicated code in set_append_references() and set_mergeappend_references() is refactored into a new function, register_pruneinfo(). This updates RT indexes by applying rtoffet and adds PartitionPruneInfo to the global list in PlannerGlobal. By allowing pruning to be performed without traversing the plan tree, this change lays the groundwork for runtime initial pruning to occur independently of plan tree initialization. Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> (earlier version) Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Tomas Vondra <tomas@vondra.me> Discussion: https://postgr.es/m/CA+HiwqFGkMSge6TgC9KQzde0ohpAycLQuV7ooitEEpbKB0O_mg@mail.gmail.com |
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