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https://issues.apache.org/jira/browse/HIVE-5657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin updated HIVE-5657:
-----------------------------------
Attachment: HIVE-5657.02.patch
Rebased and added vectorized handling.
I got a little bit carried away and added bunch of comments and renames i, j,
index variables to be more specific.
> 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
> Assignee: Navis
> Priority: Critical
> Attachments: D13797.1.patch, D13797.2.patch, HIVE-5657.02.patch,
> HIVE-5657.1.patch.txt, 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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