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java.lang.Objectorg.apache.hadoop.hive.ql.exec.Operator<UnionDesc>
org.apache.hadoop.hive.ql.exec.UnionOperator
public class UnionOperator
Union Operator Just forwards. Doesn't do anything itself.
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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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, LOG, numInputRowsCntr, numOutputRowsCntr, operatorId, out, outputObjInspector, outputRows, parentOperators, reporter, state, statsMap, timeTakenCntr, totalTime |
Constructor Summary | |
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UnionOperator()
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Method Summary | |
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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 |
initializeOp(Configuration hconf)
UnionOperator will transform the input rows if the inputObjInspectors from different parents are different. |
boolean |
opAllowedAfterMapJoin()
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boolean |
opAllowedBeforeMapJoin()
Union operators are not allowed either before or after a explicit mapjoin hint. |
boolean |
opAllowedBeforeSortMergeJoin()
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void |
processOp(Object row,
int tag)
Process the row. |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public UnionOperator()
Method Detail |
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protected void initializeOp(Configuration hconf) throws HiveException
initializeOp
in class Operator<UnionDesc>
HiveException
public void processOp(Object row, int tag) throws HiveException
Operator
processOp
in class Operator<UnionDesc>
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<UnionDesc>
public static String getOperatorName()
public OperatorType getType()
Operator
getType
in class Operator<UnionDesc>
public boolean opAllowedBeforeMapJoin()
opAllowedBeforeMapJoin
in class Operator<UnionDesc>
public boolean opAllowedAfterMapJoin()
opAllowedAfterMapJoin
in class Operator<UnionDesc>
public boolean opAllowedBeforeSortMergeJoin()
opAllowedBeforeSortMergeJoin
in class Operator<UnionDesc>
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