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https://issues.apache.org/jira/browse/TAJO-1981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15010541#comment-15010541
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Jihoon Son commented on TAJO-1981:
----------------------------------

Here are some links which explain some databases' behaviour.
* http://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj13658.html
* http://www.postgresql.org/docs/current/static/queries-order.html

> Invalid nulls sort order in VectorizedSorter
> --------------------------------------------
>
>                 Key: TAJO-1981
>                 URL: https://issues.apache.org/jira/browse/TAJO-1981
>             Project: Tajo
>          Issue Type: Bug
>          Components: Physical Operator
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>             Fix For: 0.12.0, 0.11.1
>
>
> VectorizedSorter has the same problem with that reported in TAJO-1972.



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