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https://issues.apache.org/jira/browse/CRUNCH-155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569794#comment-13569794
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Gabriel Reid commented on CRUNCH-155:
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+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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