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https://issues.apache.org/jira/browse/TAJO-994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086051#comment-14086051
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ASF GitHub Bot commented on TAJO-994:
-------------------------------------
GitHub user hyunsik opened a pull request:
https://github.com/apache/tajo/pull/106
TAJO-994: 'count(distinct x)' function counts first null value.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hyunsik/tajo TAJO-994
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/106.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #106
----
commit 2466c4a22133cc2cd495e5fc8c7126caf7586cc7
Author: Hyunsik Choi <[email protected]>
Date: 2014-08-05T09:50:58Z
TAJO-994: 'count(distinct x)' function counts first null value.
----
> '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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