org.apache.hadoop.hive.ql.exec
Class MapJoinOperator

java.lang.Object
  extended by org.apache.hadoop.hive.ql.exec.Operator<T>
      extended by org.apache.hadoop.hive.ql.exec.CommonJoinOperator<mapJoinDesc>
          extended by org.apache.hadoop.hive.ql.exec.MapJoinOperator
All Implemented Interfaces:
Serializable, Node

public class MapJoinOperator
extends CommonJoinOperator<mapJoinDesc>
implements Serializable

Map side Join operator implementation.

See Also:
Serialized Form

Nested Class Summary
static class MapJoinOperator.MapJoinObjectCtx
           
 
Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.CommonJoinOperator
CommonJoinOperator.IntermediateObject
 
Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.Operator
Operator.OperatorFunc, Operator.State
 
Field Summary
protected  Map<Byte,List<ExprNodeEvaluator>> joinKeys
          The expressions for join inputs's join keys.
protected  Map<Byte,List<ObjectInspector>> joinKeysObjectInspectors
          The ObjectInspectors for the join inputs's join keys.
protected  Map<Byte,List<ObjectInspector>> joinKeysStandardObjectInspectors
          The standard ObjectInspectors for the join inputs's join keys.
protected  Map<Byte,HTree> mapJoinTables
           
 
Fields inherited from class org.apache.hadoop.hive.ql.exec.CommonJoinOperator
alias, condn, joinValues, joinValuesObjectInspectors, joinValuesStandardObjectInspectors, noOuterJoin, numAliases, order, totalSz
 
Fields inherited from class org.apache.hadoop.hive.ql.exec.Operator
childOperators, childOperatorsArray, childOperatorsTag, colExprMap, conf, done, id, inputObjInspectors, out, outputObjInspector, parentOperators, reporter, state, statsMap
 
Constructor Summary
MapJoinOperator()
           
 
Method Summary
 void closeOp(boolean abort)
          All done
static Map<Integer,MapJoinOperator.MapJoinObjectCtx> getMapMetadata()
           
 String getName()
          Implements the getName function for the Node Interface.
protected  void initializeOp(org.apache.hadoop.conf.Configuration hconf)
          Operator specific initialization.
 void process(Object row, int tag)
          Process the row.
 
Methods inherited from class org.apache.hadoop.hive.ql.exec.CommonJoinOperator
checkAndGenObject, computeValues, endGroup, getJoinOutputObjectInspector, getNextSize, getObjectInspectorsFromEvaluators, getPosToAliasMap, getStandardObjectInspectors, populateJoinKeyValue, setPosToAliasMap, startGroup
 
Methods inherited from class org.apache.hadoop.hive.ql.exec.Operator
areAllParentsInitialized, close, dump, forward, getChildOperators, getChildren, getColumnExprMap, getConf, getDone, getIdentifier, getParentOperators, getSchema, getStats, initEvaluators, initEvaluatorsAndReturnStruct, initialize, initializeChildren, jobClose, logStats, preorderMap, removeChild, replaceChild, replaceParent, resetStats, setAlias, setChildOperators, setColumnExprMap, setConf, setDone, setId, setOutputCollector, setParentOperators, setReporter, setSchema
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

joinKeys

protected transient Map<Byte,List<ExprNodeEvaluator>> joinKeys
The expressions for join inputs's join keys.


joinKeysObjectInspectors

protected transient Map<Byte,List<ObjectInspector>> joinKeysObjectInspectors
The ObjectInspectors for the join inputs's join keys.


joinKeysStandardObjectInspectors

protected transient Map<Byte,List<ObjectInspector>> joinKeysStandardObjectInspectors
The standard ObjectInspectors for the join inputs's join keys.


mapJoinTables

protected transient Map<Byte,HTree> mapJoinTables
Constructor Detail

MapJoinOperator

public MapJoinOperator()
Method Detail

getMapMetadata

public static Map<Integer,MapJoinOperator.MapJoinObjectCtx> getMapMetadata()

initializeOp

protected void initializeOp(org.apache.hadoop.conf.Configuration hconf)
                     throws HiveException
Description copied from class: Operator
Operator specific initialization.

Overrides:
initializeOp in class CommonJoinOperator<mapJoinDesc>
Throws:
HiveException

process

public void process(Object row,
                    int tag)
             throws HiveException
Description copied from class: Operator
Process the row.

Specified by:
process in class Operator<mapJoinDesc>
Parameters:
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.
Throws:
HiveException

getName

public String getName()
Implements the getName function for the Node Interface.

Specified by:
getName in interface Node
Overrides:
getName in class CommonJoinOperator<mapJoinDesc>
Returns:
the name of the operator

closeOp

public void closeOp(boolean abort)
             throws HiveException
Description copied from class: CommonJoinOperator
All done

Overrides:
closeOp in class CommonJoinOperator<mapJoinDesc>
Throws:
HiveException


Copyright © 2009 The Apache Software Foundation