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https://issues.apache.org/jira/browse/SPARK-20569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995423#comment-15995423
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Michael Armbrust commented on SPARK-20569:
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[~rxin] this does seem like a bug.
> RuntimeReplaceable functions accept invalid third parameter
> -----------------------------------------------------------
>
> Key: SPARK-20569
> URL: https://issues.apache.org/jira/browse/SPARK-20569
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: liuxian
> Priority: Trivial
>
> >select Nvl(null,'1',3);
> >3
> The function of "Nvl" has Only two input parameters,so, when input three
> parameters, i think it should notice that:"Error in query: Invalid number of
> arguments for function nvl".
> Such as "nvl2", "nullIf","IfNull",these have a similar problem
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