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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