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@evan When the semantics of a prospective system are very simple, it is possible to use simple implementations. For instance, if the queries are limited to specifying a single string term (i.e. a user name) then one can build a simple, high-performing prospective system that extracts usernames from incoming posts and compares them to a hash-table of "queries" which are just usernames.

A proper system would allow Booleans, ranges, etc., but that requires a dramatic increase in complexity.