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https://issues.apache.org/jira/browse/TAJO-182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855462#comment-13855462
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Jihoon Son commented on TAJO-182:
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Thanks, Jinho!
> Correct NULL value handling of primitive operators
> --------------------------------------------------
>
> Key: TAJO-182
> URL: https://issues.apache.org/jira/browse/TAJO-182
> Project: Tajo
> Issue Type: Bug
> Components: planner/optimizer
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Priority: Critical
> Fix For: 0.8-incubating
>
> Attachments: TAJO-182.patch, TAJO-182_2.patch, TAJO-182_3.patch
>
>
> -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.-
> Many primitive operators including arithmetic and comparison do not consider
> three valued logic. This patch corrects this problem. The original issue
> title was 'Comparison of primitive values including null value should return
> NULL.' This issue was expanded for null value handling of all primitive
> operators.
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