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Posted to issues@spark.apache.org by "Cheng Hao (JIRA)" <ji...@apache.org> on 2014/11/05 03:32:34 UTC

[jira] [Created] (SPARK-4234) Always do paritial aggregation

Cheng Hao created SPARK-4234:
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             Summary: Always do paritial aggregation 
                 Key: SPARK-4234
                 URL: https://issues.apache.org/jira/browse/SPARK-4234
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Cheng Hao


Currently, UDAF developer optionally implement a partial aggregation function, However this probably cause performance issue by allowing do that. We actually can always force developers to provide the partial aggregation function as Hive does, hence we will always get the `mapside` aggregation optimization.



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