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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/05/01 16:50:02 UTC
[jira] [Assigned] (SPARK-30705) Improve CaseWhen sub-expression
equality
[ https://issues.apache.org/jira/browse/SPARK-30705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-30705:
------------------------------------
Assignee: Apache Spark
> 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: 3.1.0
> Reporter: Yuming Wang
> Assignee: Apache Spark
> Priority: Major
>
> We only support the first condition expression. But 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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