[jira] [Created] (FLINK-3279) Optionally disable DistinctOperator combiner

[Shang Yuanchun (Jira)]

Greg Hogan created FLINK-3279:
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             Summary: Optionally disable DistinctOperator combiner
                 Key: FLINK-3279
                 URL: https://issues.apache.org/jira/browse/FLINK-3279
             Project: Flink
          Issue Type: New Feature
          Components: DataSet API
    Affects Versions: 1.0.0
            Reporter: Greg Hogan
            Priority: Minor


Calling {{DataSet.distinct()}} executes {{DistinctOperator.DistinctFunction}} which is a combinable {{RichGroupReduceFunction}}. Sometimes we know that there will be few duplicate records and disabling the combine would improve performance.

I propose adding {{public DistinctOperator<T> setCombinable(boolean combinable)}} to {{DistinctOperator}}.



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