DB Tsai created SPARK-24953:
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Summary: Prune a branch in `CaseWhen` if previously seen
Key: SPARK-24953
URL: https://issues.apache.org/jira/browse/SPARK-24953
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.0
Reporter: DB Tsai
If a condition in a branch is previously seen, this branch can be pruned.
If the outputs of two adjacent branches are the same, two branches can be
combined.
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