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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/12/29 09:27:49 UTC

[jira] [Assigned] (SPARK-12549) UDFs' input type specification should take Option[Seq[DataType]] rather than Seq[DataType]

     [ https://issues.apache.org/jira/browse/SPARK-12549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-12549:
------------------------------------

    Assignee: Apache Spark  (was: Reynold Xin)

> UDFs' input type specification should take Option[Seq[DataType]] rather than Seq[DataType]
> ------------------------------------------------------------------------------------------
>
>                 Key: SPARK-12549
>                 URL: https://issues.apache.org/jira/browse/SPARK-12549
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Reynold Xin
>            Assignee: Apache Spark
>
> In Spark we allow UDFs to declare its expected input types in order to apply type coercion. The expected input type parameter takes a Seq[DataType] and uses Nil when no type coercion is applied.
> It makes more sense to take Option[Seq[DataType]] instead, so we can differentiate a no-arg function vs function with no expected input type specified.



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