Package org.apache.iotdb.db.mpp.transformation.dag.transformer.multi

Class MappableUDFQueryRowTransformer

java.lang.Object

org.apache.iotdb.db.mpp.transformation.dag.transformer.Transformer

org.apache.iotdb.db.mpp.transformation.dag.transformer.multi.UDFQueryTransformer

org.apache.iotdb.db.mpp.transformation.dag.transformer.multi.MappableUDFQueryRowTransformer

All Implemented Interfaces:

LayerPointReader, YieldableReader

public class MappableUDFQueryRowTransformer
extends UDFQueryTransformer

Field Summary

Fields

Modifier and Type	Field	Description
protected LayerRowReader	layerRowReader

Fields inherited from class org.apache.iotdb.db.mpp.transformation.dag.transformer.multi.UDFQueryTransformer

executor, terminated, tsDataType

Fields inherited from class org.apache.iotdb.db.mpp.transformation.dag.transformer.Transformer

cachedBinary, cachedBoolean, cachedDouble, cachedFloat, cachedInt, cachedLong, cachedTime, currentNull, hasCachedValue

Constructor Summary

Constructors

Constructor	Description
MappableUDFQueryRowTransformer(LayerRowReader layerRowReader, UDTFExecutor executor)

Method Summary

Modifier and Type	Method	Description
protected boolean	cacheValue()	if this method returns true, at least one of the cached field should be set
boolean	isConstantPointReader()
protected YieldableState	yieldValue()	if this method returns YieldableState.YIELDABLE, at least one of the cached field should be set

Methods inherited from class org.apache.iotdb.db.mpp.transformation.dag.transformer.multi.UDFQueryTransformer

getDataType, terminate

Methods inherited from class org.apache.iotdb.db.mpp.transformation.dag.transformer.Transformer

currentBinary, currentBoolean, currentDouble, currentFloat, currentInt, currentLong, currentTime, isCurrentNull, next, readyForNext, yield

Methods inherited from class java.lang.Object

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

Field Detail

layerRowReader

protected final LayerRowReader layerRowReader

Constructor Detail

MappableUDFQueryRowTransformer

public MappableUDFQueryRowTransformer(LayerRowReader layerRowReader,
                                      UDTFExecutor executor)

Method Detail

cacheValue

protected boolean cacheValue()
                      throws QueryProcessException,
                             java.io.IOException

Description copied from class: Transformer

if this method returns true, at least one of the cached field should be set

Specified by:

cacheValue in class Transformer

Throws:

QueryProcessException

java.io.IOException

yieldValue

protected YieldableState yieldValue()
                             throws QueryProcessException,
                                    java.io.IOException

Description copied from class: Transformer

if this method returns YieldableState.YIELDABLE, at least one of the cached field should be set

Specified by:

yieldValue in class Transformer

Throws:

QueryProcessException

java.io.IOException

isConstantPointReader

public boolean isConstantPointReader()