[jira] [Updated] (NIFI-7844) substring should return empty instead of throwing IndexOutOfBoundsException

["Pierre Villard (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-7844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pierre Villard updated NIFI-7844:
---------------------------------
    Status: Patch Available  (was: Open)

> substring should return empty instead of throwing IndexOutOfBoundsException
> ---------------------------------------------------------------------------
>
>                 Key: NIFI-7844
>                 URL: https://issues.apache.org/jira/browse/NIFI-7844
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Pierre Villard
>            Assignee: Pierre Villard
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In the expression language, right now, for the substring function:
> {quote}If the _starting index_ or the _ending index_ is greater than the length of the Subject or has a value less than 0, this function call will result in an error.
> {quote}
> I suggest to change this behavior and return an empty string instead. Reason being that with the current behavior, an UpdateAttribute would fail and roll back the flow file in the incoming relationship, this could cause back pressure and completely block the whole flow to be running.
> It might be worth mentioning it in the migration guide as this changes the current behavior but I still think this is a reasonable change.



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