@Override
        public void write(ClickHouseOutputStream output) throws IOException {
            ClickHouseInputStream in = input.get();
            if (in != null) {
                in.pipe(output);
            }
        }
Request object holding references to {@link ClickHouseClient},
{@link ClickHouseNode}, format, sql, options and settings etc. for execution.
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseRequest.java