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

Class UniversalUDFQueryTransformer

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.UniversalUDFQueryTransformer

All Implemented Interfaces:

LayerPointReader, YieldableReader

Direct Known Subclasses:

UDFQueryRowTransformer, UDFQueryRowWindowTransformer

public abstract class UniversalUDFQueryTransformer
extends UDFQueryTransformer

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	isLayerPointReaderConstant
protected LayerPointReader	layerPointReader

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

Modifier	Constructor	Description
protected	UniversalUDFQueryTransformer(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
protected boolean	cacheValueFromUDFOutput()
protected abstract boolean	executeUDFOnce()
boolean	isConstantPointReader()
protected abstract YieldableState	tryExecuteUDFOnce()
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

layerPointReader

protected final LayerPointReader layerPointReader

isLayerPointReaderConstant

protected final boolean isLayerPointReaderConstant

Constructor Detail

UniversalUDFQueryTransformer

protected UniversalUDFQueryTransformer(UDTFExecutor executor)

Method Detail

yieldValue

protected final 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

cacheValue

protected final 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

tryExecuteUDFOnce

protected abstract YieldableState tryExecuteUDFOnce()
                                             throws QueryProcessException,
                                                    java.io.IOException

Throws:

QueryProcessException

java.io.IOException

executeUDFOnce

protected abstract boolean executeUDFOnce()
                                   throws QueryProcessException,
                                          java.io.IOException

Throws:

QueryProcessException

java.io.IOException

cacheValueFromUDFOutput

protected final boolean cacheValueFromUDFOutput()
                                         throws QueryProcessException,
                                                java.io.IOException

Throws:

QueryProcessException

java.io.IOException

isConstantPointReader

public final boolean isConstantPointReader()