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Albert Skalt
34dad2ccee
- closes https://github.com/apache/datafusion/issues/19796 This patch aims to implement a fast-path for the ExecutionPlan::with_new_children function for some plans, moving closer to a physical plan re-use implementation and improving planning performance. If the passed children properties are the same as in self, we do not actually recompute self's properties (which could be costly if projection mapping is required). Instead, we just replace the children and re-use self's properties as-is. To be able to compare two different properties -- ExecutionPlan::properties(...) signature is modified and now returns `&Arc<PlanProperties>`. If `children` properties are the same in `with_new_children` -- we clone our properties arc and then a parent plan will consider our properties as unchanged, doing the same. - Return `&Arc<PlanProperties>` from `ExecutionPlan::properties(...)` instead of a reference. - Implement `with_new_children` fast-path if there is no children properties changes for all major plans. Note: currently, `reset_plan_states` does not allow to re-use plan in general: it is not supported for dynamic filters and recursive queries features, as in this case state reset should update pointers in the children plans. --------- Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
