[jira] [Created] (TAJO-994) 'count(distinct x)' function counts first null value.

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-994:
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             Summary: 'count(distinct x)' function counts first null value.
                 Key: TAJO-994
                 URL: https://issues.apache.org/jira/browse/TAJO-994
             Project: Tajo
          Issue Type: Bug
          Components: function/udf
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.9.0


The current count distinct function counts the first null value. Consider the 
following example column. The current count distinct function will count them 
as 4 instead of 3. We should fix it.
{noformat}
\N
A
B
B
C
{noformat}




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