[jira] [Created] (BEAM-3721) UNION ALL should be implemented via Flatten

[Kenneth Knowles (JIRA)]

Kenneth Knowles created BEAM-3721:
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             Summary: UNION ALL should be implemented via Flatten
                 Key: BEAM-3721
                 URL: https://issues.apache.org/jira/browse/BEAM-3721
             Project: Beam
          Issue Type: Improvement
          Components: dsl-sql
            Reporter: Kenneth Knowles
            Assignee: Kenneth Knowles


Currently, UNION ALL is implemented as an abstracted set operation that goes 
through CoGroupByKey, when a flatten will do.



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