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https://issues.apache.org/jira/browse/HIVE-15792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858278#comment-15858278
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Nandakumar commented on HIVE-15792:
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Thanks for the review [~thejas].
Updated the description of functions in new patch which describes the behavior
on getting empty pad string as argument
> Hive should raise SemanticException when LPAD/RPAD pad character's length is 0
> ------------------------------------------------------------------------------
>
> Key: HIVE-15792
> URL: https://issues.apache.org/jira/browse/HIVE-15792
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Chovan
> Assignee: Nandakumar
> Priority: Minor
> Attachments: HIVE-15792.000.patch, HIVE-15792.001.patch
>
>
> For example SELECT LPAD('A', 2, ''); will cause an infinite loop and the
> running query will hang without any error.
> It would be great if this could be prevented by checking the pad character's
> length and if it's 0 then throw a SemanticException.
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