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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-155) Combining union and groupByKey causes ClassCastException in DoNode during planning
Date Sun, 03 Feb 2013 15:08:13 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569794#comment-13569794
] 

Gabriel Reid commented on CRUNCH-155:
-------------------------------------

+1

My biggest worry was that this might change the semantics of a plain materialize call for
the case where it's kind of being abused to force a certain planning graph layout, but as
far as I can tell that isn't an issue with this patch.
                
> 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, CRUNCH-155.patch, 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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