Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/687
> @ottobackwards : This is opt-in for the resolvers. The
MapVariableResolver does NOT support update, so there is no change to
Enrichment, Parsers, Profile, and Shell ( beyond what has been mentioned ).
If this PR does not change Parsers, Enrichment, Profiler, and the REPL,
then what does it change? Where can I use assignment based on this PR?
Does this just give us the 'capability' to add assignment to each of those?
We would then need to change the `VariableResolver`s used in each of those
areas to use the assignment as you've implemented it here?
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