@Override
  public void transform(Row row, PointCollector pointCollector) throws Exception {
    timestamp.add(row.getTime());
    value.add(Util.getValueAsDouble(row));
  }
This function calculates discrete wavelet transform of an input series. Input series must be an
integer exponent of 2. Input series is treated as sampled in equal distances.
library-udf/src/main/java/org/apache/iotdb/library/frequency/UDTFDWT.java