Package org.apache.iotdb.commons.udf.builtin

Class UDTFDerivative

java.lang.Object

org.apache.iotdb.commons.udf.builtin.UDTFValueTrend

org.apache.iotdb.commons.udf.builtin.UDTFDerivative

All Implemented Interfaces:

org.apache.iotdb.udf.api.UDF, org.apache.iotdb.udf.api.UDTF

Direct Known Subclasses:

UDTFCommonDerivative, UDTFNonNegativeDerivative

public abstract class UDTFDerivative
extends UDTFValueTrend

Field Summary

Fields

Modifier and Type	Field	Description
protected long	previousTime

Fields inherited from class org.apache.iotdb.commons.udf.builtin.UDTFValueTrend

dataType, hasPrevious, previousDouble, previousFloat, previousInt, previousLong

Constructor Summary

Constructors

Constructor	Description
UDTFDerivative()

Method Summary

Modifier and Type	Method	Description
void	beforeStart(org.apache.iotdb.udf.api.customizer.parameter.UDFParameters parameters, org.apache.iotdb.udf.api.customizer.config.UDTFConfigurations configurations)
void	transform(org.apache.iotdb.udf.api.access.Row row, org.apache.iotdb.udf.api.collector.PointCollector collector)

Methods inherited from class org.apache.iotdb.commons.udf.builtin.UDTFValueTrend

doTransform, updatePreviousValue, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.iotdb.udf.api.UDF

beforeDestroy

Methods inherited from interface org.apache.iotdb.udf.api.UDTF

terminate, transform, transform

Field Detail

previousTime

protected long previousTime

Constructor Detail

UDTFDerivative

public UDTFDerivative()

Method Detail

beforeStart

public void beforeStart(org.apache.iotdb.udf.api.customizer.parameter.UDFParameters parameters,
                        org.apache.iotdb.udf.api.customizer.config.UDTFConfigurations configurations)
                 throws MetadataException

Throws:

MetadataException

transform

public void transform(org.apache.iotdb.udf.api.access.Row row,
                      org.apache.iotdb.udf.api.collector.PointCollector collector)
               throws org.apache.iotdb.udf.api.exception.UDFInputSeriesDataTypeNotValidException,
                      java.io.IOException

Throws:

org.apache.iotdb.udf.api.exception.UDFInputSeriesDataTypeNotValidException

java.io.IOException