presto-main/src/main/java/io/prestosql/operator/ExchangeClientStatus.java/ExchangeClientStatus/toString
class ExchangeClientStatus:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("bufferBytes", bufferedBytes)
                .add("maxBufferedBytes", maxBufferedBytes)
                .add("averageBytesPerRequest", averageBytesPerRequest)
                .add("successfulRequestsCount", successfulRequestsCount)
                .add("bufferedPages", bufferedPages)
                .add("noMoreLocations", noMoreLocations)
                .add("pageBufferClientStatuses", pageBufferClientStatuses)
                .toString();
    }