Srdan Srepfler commented on CALCITE-2186:

Fair point, I'm not quite sure if there's enough Runtime information for Java 
reflection though. It might be possible some sort of macro/compile time 
artifact would be needed.

> Implement ScalaTypeFactory
> --------------------------
>                 Key: CALCITE-2186
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2186
>             Project: Calcite
>          Issue Type: New Feature
>            Reporter: Srdan Srepfler
>            Assignee: Julian Hyde
>            Priority: Minor
> It would be useful to have a ScalaTypeFactory which would work out of the box 
> for case class parameters list.
> Possibly it could be extensible to support via extensions with some common 
> Scala record patterns like HList's, tuples and similar.

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