(combined == null) ? byFields.aggregateFieldsById(inputs, combineFn, fieldAggregation.outputField) : combined.aggregateFieldsById(inputs, combineFn, fieldAggregation.outputField); } else {
(combined == null) ? byFields.aggregateFieldsById(inputs, combineFn, fieldAggregation.outputField) : combined.aggregateFieldsById(inputs, combineFn, fieldAggregation.outputField); } else {