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From "Shaofeng SHI (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (KYLIN-2948) Count a column returns the same result as count(*) even if this column has NULL
Date Fri, 14 Sep 2018 03:17:00 GMT

     [ https://issues.apache.org/jira/browse/KYLIN-2948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shaofeng SHI closed KYLIN-2948.
-------------------------------
       Resolution: Duplicate
    Fix Version/s: v2.4.0

> Count a column returns the same result as count(*) even if this column has NULL
> -------------------------------------------------------------------------------
>
>                 Key: KYLIN-2948
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2948
>             Project: Kylin
>          Issue Type: Bug
>    Affects Versions: v2.1.0
>         Environment: CentOS 7
>            Reporter: DeXin
>            Priority: Critical
>             Fix For: v2.4.0
>
>
> When we want to count a column(with same NULL value), there is different result from
kylin and hive SQL. Is there a way to exclude NULL value in count measure calculation for
a particular column? 
> Here is the example:
> 1. Here is source data:
> Date             ID
> 2017-10-10  dfe343ddfe3f5
> 2017-10-11  fer234d656dff
> 2017-10-11  NULL
> 2017-10-12  jui6jnc3ncce3
> 2. run SQL in Hive:
> select Date, count(*), count(ID) from table group by Date;
> 2017-10-10  1  1
> 2017-10-11  2  1
> 2017-10-12  1  1
> 3. run same SQL in Kylin:
> select Date, count(*), count(ID) from table group by Date;
> 2017-10-10  1  1
> 2017-10-11  2  2
> 2017-10-12  1  1



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