Yuming Wang created SPARK-30705:
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Summary: Improve CaseWhen sub-expression equality
Key: SPARK-30705
URL: https://issues.apache.org/jira/browse/SPARK-30705
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Yuming Wang
We only support the first condition expression. We can improve this pattern:
{code: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
{code}
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