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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