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From "Jeremy Beard (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-464) Empty PCollection returns null Long for length().getValue()
Date Tue, 19 Aug 2014 03:23:18 GMT
Jeremy Beard created CRUNCH-464:
-----------------------------------

             Summary: Empty PCollection returns null Long for length().getValue()
                 Key: CRUNCH-464
                 URL: https://issues.apache.org/jira/browse/CRUNCH-464
             Project: Crunch
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.10.0
            Reporter: Jeremy Beard
            Assignee: Josh Wills


PCollection lengths are determined by summing 1s for each record, but when the PCollection
is empty there is no sum and so the PObject returns a null length. Fix is to emit a 0 at the
cleanup() of each DoFn instantiation, forcing a sum when there are no input records.



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