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java.lang.Objectorg.apache.hadoop.hive.ql.exec.Operator<selectDesc>
org.apache.hadoop.hive.ql.exec.SelectOperator
public class SelectOperator
Select operator implementation
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 ExprNodeEvaluator[] |
eval
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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, id, inputObjInspectors, inputRows, LOG, numInputRowsCntr, numOutputRowsCntr, operatorId, out, outputObjInspector, outputRows, parentOperators, reporter, state, statsMap, timeTakenCntr, totalTime |
Constructor Summary | |
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SelectOperator()
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Method Summary | |
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String |
getName()
Implements the getName function for the Node Interface. |
int |
getType()
Should be overridden to return the type of the specific operator among the types in OperatorType |
protected void |
initializeOp(org.apache.hadoop.conf.Configuration hconf)
Operator specific initialization. |
void |
processOp(Object row,
int tag)
Process the row. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected transient ExprNodeEvaluator[] eval
Constructor Detail |
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public SelectOperator()
Method Detail |
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protected void initializeOp(org.apache.hadoop.conf.Configuration hconf) throws HiveException
Operator
initializeOp
in class Operator<selectDesc>
HiveException
public void processOp(Object row, int tag) throws HiveException
Operator
processOp
in class Operator<selectDesc>
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 String getName()
Operator
getName
in interface Node
getName
in class Operator<selectDesc>
public int getType()
Operator
getType
in class Operator<selectDesc>
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