org.apache.hadoop.hive.ql.exec

Class ForwardOperator

java.lang.Object

org.apache.hadoop.hive.ql.exec.Operator<ForwardDesc>

org.apache.hadoop.hive.ql.exec.ForwardOperator

All Implemented Interfaces:

Serializable, Cloneable, Node

public class ForwardOperator
extends Operator<ForwardDesc>
implements Serializable

Forward Operator Just forwards. Doesn't do anything itself.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.Operator

Operator.Counter, Operator.OperatorFunc, Operator.State

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.exec.Operator

abortOp, alias, asyncInitOperations, bucketingVersion, cContext, childOperators, childOperatorsArray, childOperatorsTag, conf, CONTEXT_NAME_KEY, done, groupKeyObject, HIVE_COUNTER_CREATED_DYNAMIC_PARTITIONS, HIVE_COUNTER_CREATED_FILES, HIVE_COUNTER_FATAL, id, indexForTezUnion, inputObjInspectors, LOG, numRows, operatorId, out, outputObjInspector, parentOperators, reporter, runTimeNumRows, state, statsMap

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ForwardOperator() Kryo ctor.
	ForwardOperator(CompilationOpContext ctx)

Method Summary

Modifier and Type	Method and Description
boolean	acceptLimitPushdown() used for LimitPushdownOptimizer if all of the operators between limit and reduce-sink does not remove any input rows in the range of limit count, limit can be pushed down to reduce-sink operator.
String	getName() Gets the name of the node.
static String	getOperatorName()
org.apache.hadoop.hive.ql.plan.api.OperatorType	getType() Return the type of the specific operator among the types in OperatorType.
protected void	initializeOp(org.apache.hadoop.conf.Configuration hconf) Operator specific initialization.
boolean	logicalEquals(Operator other) Decides whether two operators are logically the same.
void	process(Object row, int tag) Process the row.

Methods inherited from class org.apache.hadoop.hive.ql.exec.Operator

abort, allInitializedParentsAreClosed, areAllParentsInitialized, augmentPlan, cleanUpInputFileChanged, cleanUpInputFileChangedOp, clone, cloneOp, cloneRecursiveChildren, close, closeOp, columnNamesRowResolvedCanBeObtained, completeInitializationOp, createDummy, defaultEndGroup, defaultStartGroup, dump, dump, endGroup, flush, flushRecursive, forward, forward, forward, getAdditionalCounters, getBucketingVersion, getChildOperators, getChildren, getColumnExprMap, getCompilationOpContext, getConf, getConfiguration, getCounterName, getDone, getExecContext, getGroupKeyObject, getIdentifier, getIndexForTezUnion, getInputObjInspectors, getIsReduceSink, getMarker, getNextCntr, getNumChild, getNumParent, getOperatorId, getOpTraits, getOutputObjInspector, getParentOperators, getReduceOutputName, getSchema, getStatistics, getStats, initEvaluators, initEvaluators, initEvaluatorsAndReturnStruct, initialize, initialize, initializeChildren, initializeLocalWork, initOperatorId, isUseBucketizedHiveInputFormat, jobClose, jobCloseOp, logicalEqualsTree, logStats, opAllowedAfterMapJoin, opAllowedBeforeMapJoin, opAllowedBeforeSortMergeJoin, opAllowedConvertMapJoin, passExecContext, preorderMap, processGroup, removeChild, removeChildAndAdoptItsChildren, removeParent, removeParents, replaceChild, replaceParent, reset, setAlias, setBucketingVersion, setChildOperators, setColumnExprMap, setCompilationOpContext, setConf, setDone, setExecContext, setGroupKeyObject, setIndexForTezUnion, setInputContext, setInputObjInspectors, setMarker, setNextVectorBatchGroupStatus, setOpTraits, setOutputCollector, setParentOperators, setReporter, setSchema, setStatistics, setUseBucketizedHiveInputFormat, startGroup, supportAutomaticSortMergeJoin, supportSkewJoinOptimization, supportUnionRemoveOptimization, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ForwardOperator

protected ForwardOperator()

Kryo ctor.

ForwardOperator

public ForwardOperator(CompilationOpContext ctx)

Method Detail

process

public void process(Object row,
                    int tag)
             throws HiveException

Description copied from class: Operator

Process the row.

Specified by:

process in class Operator<ForwardDesc>

Parameters:

row - The object representing the row.

tag - The tag of the row usually means which parent this row comes from. Rows with the same tag should have exactly the same rowInspector all the time.

Throws:

HiveException

getType

public org.apache.hadoop.hive.ql.plan.api.OperatorType getType()

Description copied from class: Operator

Return the type of the specific operator among the types in OperatorType.

Specified by:

getType in class Operator<ForwardDesc>

Returns:

OperatorType.*

acceptLimitPushdown

public boolean acceptLimitPushdown()

Description copied from class: Operator

used for LimitPushdownOptimizer if all of the operators between limit and reduce-sink does not remove any input rows in the range of limit count, limit can be pushed down to reduce-sink operator. forward, select, etc.

Overrides:

acceptLimitPushdown in class Operator<ForwardDesc>

getName

public String getName()

Description copied from interface: Node

Gets the name of the node. This is used in the rule dispatchers.

Specified by:

getName in interface Node

Specified by:

getName in class Operator<ForwardDesc>

Returns:

the name of the operator

getOperatorName

public static String getOperatorName()

initializeOp

protected void initializeOp(org.apache.hadoop.conf.Configuration hconf)
                     throws HiveException

Description copied from class: Operator

Operator specific initialization.

Overrides:

initializeOp in class Operator<ForwardDesc>

Throws:

HiveException

logicalEquals

public boolean logicalEquals(Operator other)

Description copied from class: Operator

Decides whether two operators are logically the same. This can be used to merge same operators and avoid repeated computation.

Overrides:

logicalEquals in class Operator<ForwardDesc>