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Posted to dev@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2013/10/26 03:26:30 UTC

[jira] [Created] (HIVE-5657) TopN produces incorrect results with count(distinct)

Sergey Shelukhin created HIVE-5657:
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             Summary: TopN produces incorrect results with count(distinct)
                 Key: HIVE-5657
                 URL: https://issues.apache.org/jira/browse/HIVE-5657
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin
            Priority: Critical
         Attachments: example.patch

Attached patch illustrates the problem.
limit_pushdown test has various other cases of aggregations and distincts, incl. count-distinct, that work correctly (that said, src dataset is bad for testing these things because every count, for example, produces one record only), so something must be special about this.
I am not very familiar with distinct- code and these nuances; if someone knows a quick fix feel free to take this, otherwise I will probably start looking next week. 




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