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java.lang.Objectorg.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.ProgressCounter, Operator.State |
Field Summary | |
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protected JobConf |
jc
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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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TableScanOperator()
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Method Summary | |
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void |
cleanUpInputFileChangedOp()
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void |
closeOp(boolean abort)
Operator specific close routine. |
String |
getName()
The operator name for this operator type. |
ArrayList<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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OperatorType |
getType()
Return the type of the specific operator among the types in OperatorType. |
protected void |
initializeOp(Configuration hconf)
Operator specific initialization. |
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(ArrayList<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, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected transient JobConf jc
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
protected void initializeOp(Configuration hconf) throws HiveException
Operator
initializeOp
in class Operator<TableScanDesc>
HiveException
public void closeOp(boolean abort) throws HiveException
Operator
closeOp
in class Operator<TableScanDesc>
HiveException
public String getName()
getName
in interface Node
getName
in class Operator<TableScanDesc>
public static String getOperatorName()
public void setNeededColumnIDs(ArrayList<Integer> orign_columns)
public ArrayList<Integer> getNeededColumnIDs()
public void setNeededColumns(List<String> columnNames)
public List<String> getNeededColumns()
public 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>
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