[SPARK-32727][SQL] Replace CaseWhen with If when there is only one case #29570
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Can one of the admins verify this patch? |
HyukjinKwon
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Duplicates #21850 |
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What changes were proposed in this pull request?
CaseWhencan be simplified toIf, when there is only one case. This opimization was partially present in thedoGenCodeofCaseWhen.Why are the changes needed?
Ifhas more potential optimization rules available than a complexCaseWhen. Optimization rules, that can work only onIfand single-caseCaseWhendo not have to handle these separately. For example #29567.Does this PR introduce any user-facing change?
No
How was this patch tested?
New UT