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java.lang.Object org.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.State |
Field Summary |
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Fields inherited from class org.apache.hadoop.hive.ql.exec.Operator |
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HIVECOUNTERCREATEDFILES, HIVECOUNTERFATAL |
Constructor Summary | |
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SelectOperator()
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Method Summary | |
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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. |
boolean |
columnNamesRowResolvedCanBeObtained()
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String |
getName()
Implements the getName function for the Node Interface. |
static String |
getOperatorName()
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org.apache.hadoop.hive.ql.plan.api.OperatorType |
getType()
Return the type of the specific operator among the types in OperatorType. |
void |
processOp(Object row,
int tag)
Process the row. |
boolean |
supportAutomaticSortMergeJoin()
Whether this operator supports automatic sort merge join. |
boolean |
supportSkewJoinOptimization()
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boolean |
supportUnionRemoveOptimization()
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Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public SelectOperator()
Method Detail |
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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 static String getOperatorName()
public org.apache.hadoop.hive.ql.plan.api.OperatorType getType()
Operator
getType
in class Operator<SelectDesc>
public boolean supportSkewJoinOptimization()
supportSkewJoinOptimization
in class Operator<SelectDesc>
public boolean columnNamesRowResolvedCanBeObtained()
columnNamesRowResolvedCanBeObtained
in class Operator<SelectDesc>
public boolean supportAutomaticSortMergeJoin()
Operator
supportAutomaticSortMergeJoin
in class Operator<SelectDesc>
public boolean supportUnionRemoveOptimization()
supportUnionRemoveOptimization
in class Operator<SelectDesc>
public boolean acceptLimitPushdown()
Operator
acceptLimitPushdown
in class Operator<SelectDesc>
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