HyukjinKwon commented on issue #26294: [SPARK-28477] [SQL] Rewrite CaseWhen with single branch to If URL: https://github.com/apache/spark/pull/26294#issuecomment-549874761 One thing we might have to consider is, analysing time. When the plan is deeply nested or has too many columns, this time overwhelms time to time. We might have to avoid to add a rule for a trivial improvement I guess. I don't feel strongly if a committer likes it but otherwise I wouldn't add.
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