Github user cestella commented on the issue:

    https://github.com/apache/metron/pull/990
  
    Yes, the caching semantics are the same as the enrichment topology; namely 
that we cache all stellar expressions.  
    
    You can, however, turn caching off in the parsers in the case that you have 
a nondeterministic stellar expression.  I'd like to be able to augment stellar 
function annotations to note expressions which are non-deterministic to avoid 
caching in those cases.
    
    Do you think we should turn it off by default?


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