Step Types Stream: Produce a stream of FFrontendQueryValues. Map: Map a FFrontendQueryEntry to a partition associated with a FFrontendQueryKey. Reduce: Apply an incremental summarization of a FFrontendQueryPartition. Transform: Alter a FFrontendQueryValue. Filter: Remove FFrontendQueryValues with a test function. Score: Calculate a score for a FFrontendQueryValue. Sort: Sort a FFrontendQueryPartition. Limit: Limit the size of a FFrontendQueryPartition.