nyingping opened a new pull request #35340:
URL: https://github.com/apache/spark/pull/35340
**What changes were proposed in this pull request?**
Remove the `CaseWhen`，Modified the calculation method of the obtained window
**Why are the changes needed?**
More simpler and more efficient
**Does this PR introduce any user-facing change?**
No.
**How was this patch tested?**
Existing test as this is just refactoring.
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