DB Tsai created SPARK-24893:
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Summary: Remove the entire CaseWhen if all the outputs are
semantic equivalence
Key: SPARK-24893
URL: https://issues.apache.org/jira/browse/SPARK-24893
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.0
Reporter: DB Tsai
Assignee: DB Tsai
Similar to [SPARK-24890], if all the outputs of `CaseWhen` are semantic
equivalence, `CaseWhen` can be removed.
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