public static double getValueAsDouble(Row row) throws IOException, NoNumberException {
    return getValueAsDouble(row, 0);
  }
Get value from 0th column from Row, and cast to double. Make sure never get null from Row.

@param row data row
@return value from 0th column from Row
@throws NoNumberException when getting a no number datatype
library-udf/src/main/java/org/apache/iotdb/library/util/Util.java