@Override
    public void setNString(int parameterIndex, String x) throws SQLException {
        checkClosed();
        values[parameterIndex - 1] = encodeObject(x);
    }
Returned metadata has only minimal information about parameters. Currently only their count.
Current implementation do not parse SQL to detect type of each parameter.

@see ParameterMetaDataImpl
@return {@link ParameterMetaDataImpl}
@throws SQLException if the statement is close
jdbc-v2/src/main/java/com/clickhouse/jdbc/PreparedStatementImpl.java