[jira] [Commented] (CRUNCH-155) Combining union and groupByKey causes ClassCastException in DoNode during planning

["Josh Wills (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CRUNCH-155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13567720#comment-13567720 ] 

Josh Wills commented on CRUNCH-155:
-----------------------------------

Thanks Tim-- I think I'll get this one done this weekend.
                
> Combining union and groupByKey causes ClassCastException in DoNode during planning
> ----------------------------------------------------------------------------------
>
>                 Key: CRUNCH-155
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-155
>             Project: Crunch
>          Issue Type: Bug
>    Affects Versions: 0.4.0
>            Reporter: Tim van Heugten
>            Assignee: Josh Wills
>            Priority: Critical
>         Attachments: ConcatGroupFn.java, FirstLetterKeyFn.java, UnionGbkTest.java, words.txt
>
>
> Create two pCollections.
> Create an outputTarget for one of them.
> Create a table from the pCollections
> Union the tables
> Group the union.
> Process the grouped data into a PCollection.
> Materialize and run the pipeline.
> Causes: java.lang.ClassCastException: org.apache.crunch.types.writable.WritableType cannot be cast to org.apache.crunch.types.PGroupedTableType
> Note: unioning first and creating a table later has the same CCE.

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