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https://issues.apache.org/jira/browse/HIVE-16977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083403#comment-16083403
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Teddy Choi commented on HIVE-16977:
-----------------------------------
It looks like HIVE-16731 already solved this issue, too. It allows not only
null values, but also other expressions.
> Vectorization: Vectorize expressions in THEN/ELSE branches of IF/CASE WHEN
> --------------------------------------------------------------------------
>
> Key: HIVE-16977
> URL: https://issues.apache.org/jira/browse/HIVE-16977
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Matt McCline
> Assignee: Teddy Choi
> Priority: Critical
>
> VectorUDFAdaptor(CASE WHEN ((_col2 > 0)) THEN ((UDFToDouble(_col3) /
> UDFToDouble(_col2)) BETWEEN 0.6666666666666666 AND 1.5) ...
> The expression in the THEN is not permitted. Only columns or constants are
> vectorized.
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