Pierre Villard created NIFI-4149:
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Summary: Indicate if EL is evaluated against FFs or not
Key: NIFI-4149
URL: https://issues.apache.org/jira/browse/NIFI-4149
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Reporter: Pierre Villard
With the addition of EL in a lot of places to improve SDLC and workflow
staging, it becomes important to indicate to users if the expression language
enabled on a property will be evaluated against the attributes of incoming flow
files or if it will only be evaluated against various variable stores (env
variables, variable registry, etc).
Actually, the expression language (without evaluation against flow files) could
be allowed on any property by default, and evaluation against flow files would
be what is actually indicated in the UI as we are doing today. Adopting this
approach could solve a lot of JIRA/PRs we are seeing to add EL on some specific
properties (without evaluation against FFs).
Having expression language to access external values could make sense on any
property for any user. However evaluating the expression language against FFs
is clearly a more complex challenge when it comes to session management and
such.
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