Github user nickwallen commented on the issue: https://github.com/apache/incubator-metron/pull/438 One thing to consider is that we have other enrichments, like the `GEO_GET` function, that add a complex type (map) to the message. So right now, that functionality is in the same boat as this PR. I like the trend that was introduced (or reinforced?) by `GEO_GET`. That is moving enrichments from custom code to Stellar. I don't think it makes sense to require all sources of enrichment (like `GEO_GET`) to flatten the data that it produces. I think doing see places an unfair burden on our users.
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