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java.lang.Objectorg.apache.hadoop.hive.ql.exec.Operator<DemuxDesc>
org.apache.hadoop.hive.ql.exec.DemuxOperator
public class DemuxOperator
DemuxOperator is an operator used by MapReduce Jobs optimized by CorrelationOptimizer. If used, DemuxOperator is the first operator in reduce phase. In the case that multiple operation paths are merged into a single one, it will dispatch the record to corresponding child operators (Join or GBY).
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.Operator |
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Operator.OperatorFunc, Operator.ProgressCounter, Operator.State |
Field Summary | |
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protected static org.apache.commons.logging.Log |
LOG
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Fields inherited from class org.apache.hadoop.hive.ql.exec.Operator |
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alias, beginTime, childOperators, childOperatorsArray, childOperatorsTag, colExprMap, conf, counterNames, counterNameToEnum, counters, done, fatalErrorCntr, groupKeyObject, id, inputObjInspectors, inputRows, isLogInfoEnabled, numInputRowsCntr, numOutputRowsCntr, operatorId, out, outputObjInspector, outputRows, parentOperators, reporter, state, statsMap, timeTakenCntr, totalTime |
Constructor Summary | |
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DemuxOperator()
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Method Summary | |
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protected void |
closeOp(boolean abort)
Operator specific close routine. |
void |
endGroup()
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void |
forward(Object row,
ObjectInspector rowInspector)
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String |
getName()
Implements the getName function for the Node Interface. |
static String |
getOperatorName()
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OperatorType |
getType()
Return the type of the specific operator among the types in OperatorType. |
protected void |
initializeChildren(Configuration hconf)
Calls initialize on each of the children with outputObjetInspector as the output row format. |
protected void |
initializeOp(Configuration hconf)
Operator specific initialization. |
void |
processOp(Object row,
int tag)
Process the row. |
void |
startGroup()
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Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected static final org.apache.commons.logging.Log LOG
Constructor Detail |
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public DemuxOperator()
Method Detail |
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protected void initializeOp(Configuration hconf) throws HiveException
Operator
initializeOp
in class Operator<DemuxDesc>
HiveException
protected void initializeChildren(Configuration hconf) throws HiveException
Operator
initializeChildren
in class Operator<DemuxDesc>
HiveException
public void processOp(Object row, int tag) throws HiveException
Operator
processOp
in class Operator<DemuxDesc>
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.
HiveException
public void forward(Object row, ObjectInspector rowInspector) throws HiveException
forward
in class Operator<DemuxDesc>
HiveException
protected void closeOp(boolean abort) throws HiveException
Operator
closeOp
in class Operator<DemuxDesc>
HiveException
public void startGroup() throws HiveException
startGroup
in class Operator<DemuxDesc>
HiveException
public void endGroup() throws HiveException
endGroup
in class Operator<DemuxDesc>
HiveException
public String getName()
Operator
getName
in interface Node
getName
in class Operator<DemuxDesc>
public static String getOperatorName()
public OperatorType getType()
Operator
getType
in class Operator<DemuxDesc>
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