Github user cestella commented on the issue: https://github.com/apache/incubator-metron/pull/207 @nickwallen There is still a PredicateProcessor because having a stellar function which acts as a predicate is a sensible differentiation from a stellar function which returns an arbitrary function. Just as there is a java.util.function.Function and a java.util.function.Predicate and they are distinct. They both reuse a base class, however.
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