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https://issues.apache.org/jira/browse/SPARK-30705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang updated SPARK-30705:
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Description:
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}
was:
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}
> 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
> 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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