presto-main/src/main/java/io/prestosql/operator/PageBufferClientStatus.java/PageBufferClientStatus/toString
class PageBufferClientStatus:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("uri", uri)
                .add("state", state)
                .add("lastUpdate", lastUpdate)
                .add("rowsReceived", rowsReceived)
                .add("pagesReceived", pagesReceived)
                .add("httpRequestState", httpRequestState)
                .toString();
    }