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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2015/12/01 22:33:10 UTC

[jira] [Created] (SPARK-12077) Use more robust plan for single distinct aggregation

Davies Liu created SPARK-12077:
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             Summary: Use more robust plan for single distinct aggregation
                 Key: SPARK-12077
                 URL: https://issues.apache.org/jira/browse/SPARK-12077
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 1.6.0
            Reporter: Davies Liu
            Assignee: Davies Liu


Use try to match the behavior for single distinct aggregation with Spark 1.5, but that's not scalable, we should be robust by default, have a flag to address performance regression for low cardinality aggregation.



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