[GitHub] [nifi] rabits opened a new pull request #3345: NIFI-6099 Added Expression Language `default` function

[GitBox <gi...@apache.org>]

rabits opened a new pull request #3345: NIFI-6099 Added Expression Language `default` function
URL: https://github.com/apache/nifi/pull/3345
 
 
   This simple change introduces `default` function for the NiFi Expression Language.
   
   ### For all changes:
   - [x] Is there a JIRA ticket associated with this PR? Is it referenced 
        in the commit message?
   
   - [x] Does your PR title start with NIFI-XXXX where XXXX is the JIRA number you are trying to resolve? Pay particular attention to the hyphen "-" character.
   
   - [ ] Has your PR been rebased against the latest commit within the target branch (typically master)?
   
   - [x] Is your initial contribution a single, squashed commit?
   
   ### For code changes:
   - [x] Have you ensured that the full suite of tests is executed via mvn -Pcontrib-check clean install at the root nifi folder?
   - [x] Have you written or updated unit tests to verify your changes?
   
   ### For documentation related changes:
   - [ ] Have you ensured that format looks appropriate for the output in which it is rendered?
   

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