[jira] [Created] (CRUNCH-329) Re-add type info to TupleWritable to make fields sort correctly

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

Josh Wills created CRUNCH-329:
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             Summary: Re-add type info to TupleWritable to make fields sort correctly
                 Key: CRUNCH-329
                 URL: https://issues.apache.org/jira/browse/CRUNCH-329
             Project: Crunch
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.10.0, 0.8.3
            Reporter: Josh Wills
            Assignee: Josh Wills
             Fix For: 0.10.0, 0.8.3


Secondary sorts aren't currently working correctly for Writable types after we hacked the TupleWritable impl to make all of the fields BytesWritables (e.g., secondary IntWritable values will no longer be sorted correctly, even though everything is still grouped correctly.)

The least-bad way that I came up with to fix this is to use integer codes for each possible WritableComparable type in a pipeline that we can use to decode what Writable type each tuple field corresponds to. This allows us to keep the various fields sortable while still doing a reasonable job of minimizing the serialization required to pass the type information along.



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