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https://issues.apache.org/jira/browse/METRON-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434544#comment-16434544
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ASF GitHub Bot commented on METRON-1520:
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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?


> Add caching for stellar field transformations
> ---------------------------------------------
>
>                 Key: METRON-1520
>                 URL: https://issues.apache.org/jira/browse/METRON-1520
>             Project: Metron
>          Issue Type: Improvement
>            Reporter: Casey Stella
>            Priority: Major
>
> Given how important caching is in the enrichment topology, we should have 
> caching for stellar field transformations in the parsers as well.



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