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fix: preserve can_repartition in WindowAggExec::replace_children (#26626) - #26675
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…che#26626) ## Which issue does this PR close? - Closes apache#26626. ## Rationale for this change When `datafusion.execution.target_partitions = 1`, the physical planner constructs `WindowAggExec` with `can_repartition = false` so that the window stage requires `SinglePartition` distribution and inserts a `CoalescePartitionsExec`. During physical optimization, replacing children via `replace_children` under `ChildrenPropertiesMode::Recompute` rebuilt `WindowAggExec` with hardcoded `can_repartition = true` instead of propagating `self.can_repartition`. This flipped the distribution requirement from `SinglePartition` to `KeyPartitioned`, stripping the required coalesce and triggering a `SanityCheckPlan` distribution error. `BoundedWindowAggExec` already correctly propagates `self.can_repartition` during `replace_children`. This change aligns `WindowAggExec` with `BoundedWindowAggExec`. ## What changes are included in this PR? - Pass `self.can_repartition` instead of `true` in `WindowAggExec::replace_children` when `ChildrenPropertiesMode::Recompute` is used. - Added unit test `test_window_agg_replace_children_preserves_can_repartition` in `window_agg_exec.rs` verifying preservation for both `false` and `true`. - Added sqllogictest regression test in `window.slt` verifying query execution with `target_partitions = 1`. ## Are these changes tested? Yes: - Local unit test `test_window_agg_replace_children_preserves_can_repartition` passed. - Integration test added to `window.slt`.
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Which issue does this PR close?
target_partitions = 1(WindowAggExeclosescan_repartitionwhen its children are replaced) #26626.Rationale for this change
When
datafusion.execution.target_partitions = 1, the physical planner constructsWindowAggExecwithcan_repartition = falseso that the window stage requiresSinglePartitiondistribution and inserts aCoalescePartitionsExec.During physical optimization, replacing children via
replace_childrenunderChildrenPropertiesMode::RecomputerebuiltWindowAggExecwith hardcodedcan_repartition = trueinstead of propagatingself.can_repartition. This flipped the distribution requirement fromSinglePartitiontoKeyPartitioned, stripping the required coalesce and triggering aSanityCheckPlandistribution error.BoundedWindowAggExecalready correctly propagatesself.can_repartitionduringreplace_children. This change alignsWindowAggExecwithBoundedWindowAggExec.What changes are included in this PR?
self.can_repartitioninstead oftrueinWindowAggExec::replace_childrenwhenChildrenPropertiesMode::Recomputeis used.test_window_agg_replace_children_preserves_can_repartitioninwindow_agg_exec.rsverifying preservation for bothfalseandtrue.window.sltverifying query execution withtarget_partitions = 1.Are these changes tested?
Yes:
test_window_agg_replace_children_preserves_can_repartitionpasses.datafusion/sqllogictest/test_files/window.sltpasses.Are there any user-facing changes?
No.