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https://issues.apache.org/jira/browse/TAJO-182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852417#comment-13852417
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Hyunsik Choi commented on TAJO-182:
-----------------------------------

This is because SQL parser does not recognize null literal. Actually, this 
needs only trivial change, and I'll do that work soon.

> Comparison of primitive values including null value should return NULL.
> -----------------------------------------------------------------------
>
>                 Key: TAJO-182
>                 URL: https://issues.apache.org/jira/browse/TAJO-182
>             Project: Tajo
>          Issue Type: Bug
>          Components: planner/optimizer
>            Reporter: Hyunsik Choi
>            Priority: Critical
>             Fix For: 0.8-incubating
>
>
> -If some domain value is compared to Null value, the current implementation 
> will cause InvalidOperationException. Such cases should result in 'false'.-
> If some domain value is compared to Null value, the current implementation 
> will cause either InvalidOperationException or FALSE. Such cases should 
> result in NULL.



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