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https://issues.apache.org/jira/browse/NIFI-482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14595901#comment-14595901
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ASF subversion and git services commented on NIFI-482:
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Commit c4c98fc4a92ef44993324c5510cc31ba4736d4b8 in incubator-nifi's branch 
refs/heads/develop from [~markap14]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-nifi.git;h=c4c98fc ]

NIFI-482: Allowed for new 'literal' function. Make expressions invalid when 
they attempt to evaluate functions against the values of 'reducing functions'; 
cleanup Evaluators that were depending on Abstract classes instead of 
interfaces. Updated EL Guide to include new 'literal' function


> users are currently able to evaluate a function against the result of an 
> aggregrate function
> --------------------------------------------------------------------------------------------
>
>                 Key: NIFI-482
>                 URL: https://issues.apache.org/jira/browse/NIFI-482
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 0.0.2
>            Reporter: Ben Icore
>            Assignee: Mark Payne
>             Fix For: 0.2.0
>
>         Attachments: 
> 0001-NIFI-482-Allowed-for-new-literal-function.-Make-expr.patch
>
>
> users should not be able to evaluate a function against the result of an 
> aggregrate function as it will often yield indeterminate results.
>  
> expression should be invalid



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