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https://issues.apache.org/jira/browse/NIFI-7844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17205885#comment-17205885
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ASF subversion and git services commented on NIFI-7844:
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Commit f32405ed16b7e07a0d445f1ed19032acaf33246d in nifi's branch
refs/heads/main from Pierre Villard
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=f32405e ]
NIFI-7844 - substring should return empty instead of throwing
IndexOutOfBoundsException
This closes #4553
Signed-off-by: Mike Thomsen <mthom...@apache.org>
> 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: 20m
> 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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