Avoid changing project_schema signature #2
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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. Also, there are other improvements. The patch includes the following changes: - 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. - Store `Arc<[usize]>` instead of vector within `FilterExec`. - Store `Arc<[usize]>` instead of vector within projection of `HashJoinExec`. - Store `Arc<[Arc<AggregateFunctionExpr>]>` instead of vec for aggr expr and filters. - Store `Arc<[ProjectionExpr]> instead of vec in `ProjectionExprs` struct. - Get `Option<&[usize]>` instead of option vec ref in `project_schema` -- it makes API more flexible. 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. Closes apache#19796
alamb
commented
Jan 15, 2026
| /// projecting to `vec![2, 1]` would return statistics for columns `{"c", | ||
| /// "b"}`. | ||
| pub fn project(mut self, projection: Option<&[usize]>) -> Self { | ||
| pub fn project(mut self, projection: Option<impl AsRef<[usize]>>) -> Self { |
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The idea is to make this function generic so the previous signature can mostly be used
askalt
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This is a proposal for apache#19792 that avoids having to change most callsites of
project_schema