org.teiid.query.processor.relational

Class NullNode

java.lang.Object

org.teiid.query.processor.relational.RelationalNode

org.teiid.query.processor.relational.NullNode

All Implemented Interfaces:

Cloneable, BatchCollector.BatchProducer

public class NullNode
extends RelationalNode

Field Summary

Fields inherited from class org.teiid.query.processor.relational.RelationalNode

childCount

Constructor Summary

Constructors

Constructor and Description
NullNode(int nodeID)

Method Summary

Modifier and Type	Method and Description
Object	clone() All the implementation of Cloneable interface need to implement clone() method.
List	getOutputElements() Get list of resolved elements describing output columns for this plan.
TupleBatch	nextBatchDirect() Template method for subclasses to implement.

Methods inherited from class org.teiid.query.processor.relational.RelationalNode

addBatchRow, addChild, close, closeDirect, copyTo, createLookupMap, getBatchSize, getBuffer, getBufferDirect, getBufferManager, getChildCount, getChildren, getClassName, getConnectionID, getContext, getDataManager, getDescriptionProperties, getElements, getEstimateNodeCardinality, getID, getNodeStatistics, getNodeString, getParent, getProjectionIndexes, hasBuffer, hasPendingRows, initialize, isBatchFull, isClosed, isLastBatch, nextBatch, nodeToString, open, projectTuple, projectTuple, pullBatch, requiresTransaction, reset, setContext, setElements, setEstimateDepAccessCardinality, setEstimateDepJoinCost, setEstimateJoinCost, setEstimateNodeCardinality, setEstimateNodeSetSize, setID, setParent, terminateBatches, toString, unwrapException

Methods inherited from class java.lang.Object

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

Constructor Detail

NullNode

public NullNode(int nodeID)

Method Detail

nextBatchDirect

public TupleBatch nextBatchDirect()
                           throws TeiidComponentException

Description copied from class: RelationalNode

Template method for subclasses to implement.

Specified by:

nextBatchDirect in class RelationalNode

Returns:

Throws:

BlockedException

TeiidComponentException

getOutputElements

public List getOutputElements()

Description copied from interface: BatchCollector.BatchProducer

Get list of resolved elements describing output columns for this plan.

Specified by:

getOutputElements in interface BatchCollector.BatchProducer

Overrides:

getOutputElements in class RelationalNode

Returns:

List of SingleElementSymbol

clone

public Object clone()

Description copied from class: RelationalNode

All the implementation of Cloneable interface need to implement clone() method. The plan is only clonable in the pre-execution stage, not the execution state (things like program state, result sets, etc). It's only safe to call that method in between query processings, in other words, it's only safe to call clone() on a plan after nextTuple() returns null, meaning the plan has finished processing.

Specified by:

clone in class RelationalNode