@Override
    public void flush() throws IOException {
        ensureOpen();

        if (buffer.position() > 0) {
            updateBuffer(true);
        }
    }
A combination of {@link java.io.PipedOutputStream} and
{@link java.io.PipedInputStream} for streaming data between server and
client. To avoid dead lock and high memory usage, please make sure writer and
reader are on two separate threads.
clickhouse-data/src/main/java/com/clickhouse/data/stream/BlockingPipedOutputStream.java