Re: Why Scala Option is not a valid key?

Posted by Timur Fayruzov on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Why-Scala-Option-is-not-a-valid-key-tp5792p5794.html

There is some more detail to this question that I missed initially. It turns out that my key is a case class of a form MyKey(k1: Option[String], k2: Option[String]). Keys.SelectorFunctionKeys is performing a recursive check whether every element of the MyKey class can be a key and fails when encountering an Option.

Is it possible to work around this situation without giving up Options? Inability to use Options in Domain objects could be really frustrating.

Thanks,

Timur

On Tue, Mar 29, 2016 at 10:19 AM, Timur Fayruzov <[hidden email]> wrote:

Hello,

I'm evaluating Flink and one thing I noticed is Option[A] can't be used as a key for coGroup (looking specifically here: https://github.com/apache/flink/blob/master/flink-scala/src/main/scala/org/apache/flink/api/scala/typeutils/OptionTypeInfo.scala#L39). I'm not clear about the reason of this and appreciate if someone can explain.

Thanks,

Timur