FlatMapNode

planner

FlatMappedProducer

summingbird

fanOut

DependantGraph

filter

Producer

filterKeys

KeyedProducer

filterValues

KeyedProducer

flatMap

Producer

flatMapKeys

KeyedProducer

flatMapValues

KeyedProducer

fn

FlatMappedProducer KeyFlatMappedProducer OptionMappedProducer

fuzz

CacheSize