Github user asfgit closed the pull request at:
https://github.com/apache/metron/pull/721
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GitHub user nickwallen opened a pull request:
https://github.com/apache/metron/pull/721
METRON-1138 Improve Error Message with Bad Profile Expression
I have found that it can be very natural for a new Profiler user to attempt
to reference a field defined in a telemetry message, in a
