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https://issues.apache.org/jira/browse/DRILL-3076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615897#comment-14615897
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Sean Hsuan-Yi Chu commented on DRILL-3076:
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Why do we disable it?
Besides, in unit test, TestJoinNullable class, we have been accepting "using" 
in a few tests.

> USING clause should not be supported in drill 
> ----------------------------------------------
>
>                 Key: DRILL-3076
>                 URL: https://issues.apache.org/jira/browse/DRILL-3076
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.0.0
>            Reporter: Victoria Markman
>            Assignee: Sean Hsuan-Yi Chu
>             Fix For: 1.2.0
>
>
> For the same reason natural join is not supported.
> See https://issues.apache.org/jira/browse/DRILL-1986



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