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java.lang.Object org.apache.hadoop.hive.ql.exec.Operator<TableScanDesc> org.apache.hadoop.hive.ql.exec.TableScanOperator
public class TableScanOperator
Table Scan Operator If the data is coming from the map-reduce framework, just forward it. This will be needed as part of local work when data is not being read as part of map-reduce framework
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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TableScanOperator()
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Method Summary | |
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void |
cleanUpInputFileChangedOp()
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Operator<? extends OperatorDesc> |
clone()
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void |
closeOp(boolean abort)
Operator specific close routine. |
String |
getName()
The operator name for this operator type. |
List<Integer> |
getNeededColumnIDs()
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List<String> |
getNeededColumns()
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static String |
getOperatorName()
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TableDesc |
getTableDesc()
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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)
Other than gathering statistics for the ANALYZE command, the table scan operator does not do anything special other than just forwarding the row. |
void |
setNeededColumnIDs(List<Integer> orign_columns)
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void |
setNeededColumns(List<String> columnNames)
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void |
setTableDesc(TableDesc tableDesc)
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boolean |
supportAutomaticSortMergeJoin()
Whether this operator supports automatic sort merge join. |
boolean |
supportSkewJoinOptimization()
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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 TableScanOperator()
Method Detail |
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public TableDesc getTableDesc()
public void setTableDesc(TableDesc tableDesc)
public void processOp(Object row, int tag) throws HiveException
processOp
in class Operator<TableScanDesc>
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 cleanUpInputFileChangedOp() throws HiveException
cleanUpInputFileChangedOp
in class Operator<TableScanDesc>
HiveException
public void closeOp(boolean abort) throws HiveException
Operator
HiveException
public String getName()
getName
in interface Node
getName
in class Operator<TableScanDesc>
public static String getOperatorName()
public void setNeededColumnIDs(List<Integer> orign_columns)
public List<Integer> getNeededColumnIDs()
public void setNeededColumns(List<String> columnNames)
public List<String> getNeededColumns()
public org.apache.hadoop.hive.ql.plan.api.OperatorType getType()
Operator
getType
in class Operator<TableScanDesc>
public boolean supportSkewJoinOptimization()
supportSkewJoinOptimization
in class Operator<TableScanDesc>
public boolean supportAutomaticSortMergeJoin()
Operator
supportAutomaticSortMergeJoin
in class Operator<TableScanDesc>
public Operator<? extends OperatorDesc> clone() throws CloneNotSupportedException
clone
in class Operator<TableScanDesc>
CloneNotSupportedException
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