Github user ckmcd commented on the pull request:
https://github.com/apache/nifi/pull/303#issuecomment-221658273
@markap14 wrote
> In the vast majority of use cases, I would expect that the JSON Path will
be a literal string that does not reference any attributes. In this case, I
would want to avoid compiling the JSON Path every time. Would recommend that if
the jsonPathExp is an instance of the StringLiteralEvaluator, we pre-compile
the JSON Path. We follow a similar pattern with the MatchesEvaluator for
pre-compiling regular expressions, and it can make a pretty huge difference on
performance.
Mark, can you show me an example of how to write an expression that would
not be using a StringLiteralEvaluator?
Thanks!
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