question: returns true if the provided aggregator is used in the constructing pipeline . concode_field_sep BiMap<AppliedPTransform<?,?,?>,String> appliedStepNames concode_elem_sep Map<Aggregator<?,?>,Collection<PTransform<?,?>>> aggregatorTransforms concode_elem_sep Multimap<PTransform<?,?>,AppliedPTransform<?,?,?>> transformAppliedTransforms concode_field_sep AppliedPTransform<?,?,?> getAppliedTransformForStepName concode_elem_sep Collection<String> getAggregatorStepNames
target: boolean function ( Aggregator < ? , ? > arg0 ) { return aggregatorTransforms . containsKey ( arg0 ) ; }