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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2806) No TypeInfo for Scala's Nothing type
Date Fri, 02 Oct 2015 11:59:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941056#comment-14941056
] 

ASF GitHub Bot commented on FLINK-2806:
---------------------------------------

Github user ggevay commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1212#discussion_r41014072
  
    --- Diff: flink-scala/src/main/scala/org/apache/flink/api/scala/codegen/TypeInformationGen.scala
---
    @@ -23,6 +23,7 @@ import org.apache.flink.api.common.ExecutionConfig
     import org.apache.flink.api.common.typeinfo._
     import org.apache.flink.api.common.typeutils._
     import org.apache.flink.api.java.typeutils._
    +import org.apache.flink.api.scala.typeutils.ScalaNothingTypeInfo
     import org.apache.flink.api.scala.typeutils.{CaseClassSerializer, CaseClassTypeInfo}
    --- End diff --
    
    Thx, done.


> No TypeInfo for Scala's Nothing type
> ------------------------------------
>
>                 Key: FLINK-2806
>                 URL: https://issues.apache.org/jira/browse/FLINK-2806
>             Project: Flink
>          Issue Type: Bug
>          Components: Scala API
>            Reporter: Gabor Gevay
>            Assignee: Gabor Gevay
>            Priority: Minor
>
> When writing some generic code, I encountered a situation where I needed a TypeInformation[Nothing].
Two problems prevent me from getting it:
> 1. TypeInformationGen.mkTypeInfo doesn't return a real TypeInformation[Nothing]. (It
actually returns a casted null in that case.)
> 2. The line
> implicit def createTypeInformation[T]: TypeInformation[T] = macro TypeUtils.createTypeInfo[T]
> does not fire in some situations when it should, when T = Nothing. (I guess this is a
compiler bug.)
> I will open a PR shortly.



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