[jira] [Resolved] (HIVE-5658) count(distinct) produces confusing results for null

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-5658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Shelukhin resolved HIVE-5658.
------------------------------------

    Resolution: Not A Problem

> count(distinct) produces confusing results for null
> ---------------------------------------------------
>
>                 Key: HIVE-5658
>                 URL: https://issues.apache.org/jira/browse/HIVE-5658
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>
> {code}
> select csmallint, count(distinct(csmallint)) from alltypesorc group by csmallint limit 3;
> {code}
> produces:
> {noformat}
> NULL	0
> -16379	1
> -16373	1
> {noformat}
> There are records in table with NULL values; however the count in this case should be 1, not 0, it seems. This is with TopN disabled, so it is unrelated to the other bug



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