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https://issues.apache.org/jira/browse/NIFI-5276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Burgess resolved NIFI-5276.
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Resolution: Not A Problem
Closing this issue as the functionality already exists with
allMatchingAttributes
> Add collectMatchingAttributes() function to NiFi Expression Language
> --------------------------------------------------------------------
>
> Key: NIFI-5276
> URL: https://issues.apache.org/jira/browse/NIFI-5276
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Matt Burgess
> Priority: Minor
>
> The EL functions for operating on attributes have been limited to expressions
> that result in boolean values, whether one or all attributes match the
> expression and the resulting operations result in true/false (true if all,
> true/false if any). This capability has been somewhat covered in NIFI-1705,
> but if a "collectMatchingAttributes" function was added to NiFi Expression
> Language, any following expressions resulting in strings (via a reducing
> operation like join()) would allow for the same capability, including the
> power of evoking other EL functions such as toLower(), etc.
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