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From "Tim van Heugten (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-155) Combining union and groupByKey causes ClassCastException in DoNode during planning
Date Tue, 29 Jan 2013 14:23:12 GMT
Tim van Heugten created CRUNCH-155:
--------------------------------------

             Summary: 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
            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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