wangyum commented on PR #48789:
URL: https://github.com/apache/spark/pull/48789#issuecomment-2470788094
The ordering of child of `Window` can satisfies:
```
Sort [year#282 ASC NULLS FIRST, course#281 ASC NULLS FIRST], true, 0
+- Window [sum(earnings#283) windowspecdefinition(year#282 ASC NULLS FIRST,
course#281 ASC NULLS FIRST, specifiedwindowframe(RangeFrame,
unboundedpreceding$(), currentrow$())) AS balance#280], [year#282 ASC NULLS
FIRST, course#281 ASC NULLS FIRST]
+- Sort [year#282 ASC NULLS FIRST, course#281 ASC NULLS FIRST], false, 0
<---
+- ShuffleQueryStage 0
```
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