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https://issues.apache.org/jira/browse/NIFI-6099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16784114#comment-16784114
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Rabits commented on NIFI-6099:
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Yep, that's right. I thought that if variable is undefined it will raise an
exception, but it just becomes null - so replaceNull will work fine!
> NiFi Expression Language `default` function
> -------------------------------------------
>
> Key: NIFI-6099
> URL: https://issues.apache.org/jira/browse/NIFI-6099
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Affects Versions: 1.9.0
> Reporter: Rabits
> Priority: Minor
> Time Spent: 40m
> Remaining Estimate: 0h
>
> It will be really great to support default('defaultValue') function for NFEL
> - users could use default values of variable is undefined/null.
> Function can help with creating interfaces together with NIFI-6098
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