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 > You are receiving this because you commented. > Reply to this email directly, view it on GitHub > <https://github.com/apache/spark/pull/15979#issuecomment-264689198>, or mute > the thread > <https://github.com/notifications/unsubscribe-auth/AAyIJD-_dmJODKn5_k8MHRFaJkHvL9uRks5rEmzCgaJpZM4K5fEL> > . >
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