@Override
    public void close() throws SQLException {
        super.close();
        try {
            if (out != null) {
                out.close();
                out = null;
            }
            writer = null;
        } catch (Exception e) {
            // ignore
        }
    }
Implements data streaming through Client Writer API.
See {@link PreparedStatementImpl}
jdbc-v2/src/main/java/com/clickhouse/jdbc/WriterStatementImpl.java