Github user koertkuipers commented on the issue:
https://github.com/apache/spark/pull/15979
Yes it worked before
On Dec 4, 2016 02:33, "Wenchen Fan" <notificati...@github.com> wrote:
> val x: Dataset[String, Option[(String, String)]] = ...
> x.groupByKey(_._1).mapValues(_._2).agg(someAgg)
>
> Does it work before?
>
> Please see the discussion in the JIRA: https://issues.apache.org/
> jira/browse/SPARK-18251
> Ideally we have a map between type T and catalyst schema, and Option[T]
> maps to the same catalyst schema with T, with additional null handling.
> We shouldn't change this mapping, which means we can't use a single field
> struct type to represent Option[T].
>
> It's still possible to support Option[T] completely(without breaking
> backward compatibility), but that may need a lof of hacky code and special
> handling, I don't think it worth, as we can easy work around it, by Tuple1
> .
>
> â
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