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https://issues.apache.org/jira/browse/SPARK-42223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17681540#comment-17681540
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Apache Spark commented on SPARK-42223:
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User 'wankunde' has created a pull request for this issue:
https://github.com/apache/spark/pull/39780
> Remove duplicate branches in CASE_WHEN and COALESCE function
> ------------------------------------------------------------
>
> Key: SPARK-42223
> URL: https://issues.apache.org/jira/browse/SPARK-42223
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Wan Kun
> Priority: Minor
>
> We can remove the duplicate branches in CASE_WHEN and COALESCE function.
> For example:
> {code:sql}
> SELECT
> CASE WHEN id = 200 THEN 1
> WHEN id = 200 THEN 2 -- same condition, can remove
> WHEN id = 200 THEN 3 -- same condition, can remove
> ELSE 0 END as c1,
> coalesce(
> id + 1,
> id + 1, -- same expression, can remove
> id) as c2
> FROM t1
> {code}
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