wangyum opened a new pull request #27436: [SPARK-30705][SQL] Improve CaseWhen sub-expression equality URL: https://github.com/apache/spark/pull/27436 ### What changes were proposed in this pull request? For CaseWhen, we currently only support the first condition expression. This PR improves this pattern: ```sql CASE WHEN testUdf(a) > 3 THEN 4 WHEN testUdf(a) = 3 THEN 3 WHEN testUdf(a) = 2 THEN 2 WHEN testUdf(a) = 1 THEN 1 ELSE 0 END ``` ### Why are the changes needed? Improve query performance. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Unit test.
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