presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorSessionProperties.java/RaptorSessionProperties/getReaderStreamBufferSize
class RaptorSessionProperties:    public static DataSize getReaderStreamBufferSize(ConnectorSession session)
    {
        return session.getProperty(READER_STREAM_BUFFER_SIZE, DataSize.class);
    }