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https://issues.apache.org/jira/browse/CALCITE-1466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17954452#comment-17954452
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Zhengqiang Duan commented on CALCITE-1466:
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Hi [~mbudiu], thank you for your remind. As I have been very busy with my work 
in recent months, I don't have time to complete this task. If you are 
interested in continuing this task, I would be very grateful.

> Support for UNSIGNED types of TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT in 
> type system
> --------------------------------------------------------------------------------------
>
>                 Key: CALCITE-1466
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1466
>             Project: Calcite
>          Issue Type: Improvement
>          Components: avatica
>            Reporter: Rajeshbabu Chintaguntla
>            Assignee: Zhengqiang Duan
>            Priority: Major
>              Labels: pull-request-available
>
> There are some data bases like MySQL supporting unsigned data types.  Apache 
> Phoenix also supports them. Would be great to add them to calcite as well.
> http://dev.mysql.com/doc/refman/5.7/en/integer-types.html



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