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https://issues.apache.org/jira/browse/SPARK-7321?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin reopened SPARK-7321:
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> Add Column expression for conditional statements (if, case)
> -----------------------------------------------------------
>
> Key: SPARK-7321
> URL: https://issues.apache.org/jira/browse/SPARK-7321
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Chen Song
> Priority: Critical
> Fix For: 1.4.0
>
>
> A good reference implementation is
> http://www.jooq.org/doc/3.6/manual-single-page/#case-expressions
> As an example in Python:
> {code}
> when(df.age == 1, "one").when(df.age == 2, "two").otherwise("unknown")
> {code}
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