org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators
Class PORead

java.lang.Object
  extended by org.apache.pig.impl.plan.Operator<PhyPlanVisitor>
      extended by org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
          extended by org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PORead
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>

public class PORead
extends PhysicalOperator

This operator is used to read tuples from a databag in memory. Used mostly for testing. It'd also be useful for the example generator

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
dummyBag, dummyBool, dummyDBA, dummyDouble, dummyFloat, dummyInt, dummyLong, dummyMap, dummyString, dummyTuple, input, inputAttached, inputs, lineageTracer, outputs, parentPlan, pigLogger, reporter, requestedParallelism, res, resultType, serialVersionUID
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
PORead(OperatorKey k)
           
PORead(OperatorKey k, DataBag bag)
           
PORead(OperatorKey k, int rp)
           
PORead(OperatorKey k, int rp, List<PhysicalOperator> inp)
           
PORead(OperatorKey k, List<PhysicalOperator> inp)
           
 
Method Summary
 Result getNext(Tuple t)
           
 String name()
           
 boolean supportsMultipleInputs()
          Indicates whether this operator supports multiple inputs.
 boolean supportsMultipleOutputs()
          Indicates whether this operator supports multiple outputs.
 void visit(PhyPlanVisitor v)
          Visit this node with the provided visitor.
 
Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
attachInput, clone, cloneHelper, detachInput, getInputs, getLogger, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getPigLogger, getRequestedParallelism, getResultType, isBlocking, isInputAttached, processInput, setInputs, setLineageTracer, setParentPlan, setPigLogger, setReporter, setRequestedParallelism, setResultType
 
Methods inherited from class org.apache.pig.impl.plan.Operator
compareTo, equals, getOperatorKey, hashCode, toString
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

PORead

public PORead(OperatorKey k)

PORead

public PORead(OperatorKey k,
              int rp,
              List<PhysicalOperator> inp)

PORead

public PORead(OperatorKey k,
              int rp)

PORead

public PORead(OperatorKey k,
              List<PhysicalOperator> inp)

PORead

public PORead(OperatorKey k,
              DataBag bag)
Method Detail

getNext

public Result getNext(Tuple t)
Overrides:
getNext in class PhysicalOperator

name

public String name()
Specified by:
name in class Operator<PhyPlanVisitor>

supportsMultipleInputs

public boolean supportsMultipleInputs()
Description copied from class: Operator
Indicates whether this operator supports multiple inputs.

Specified by:
supportsMultipleInputs in class Operator<PhyPlanVisitor>
Returns:
true if it does, otherwise false.

supportsMultipleOutputs

public boolean supportsMultipleOutputs()
Description copied from class: Operator
Indicates whether this operator supports multiple outputs.

Specified by:
supportsMultipleOutputs in class Operator<PhyPlanVisitor>
Returns:
true if it does, otherwise false.

visit

public void visit(PhyPlanVisitor v)
           throws VisitorException
Description copied from class: Operator
Visit this node with the provided visitor. This should only be called by the visitor class itself, never directly.

Specified by:
visit in class PhysicalOperator
Parameters:
v - Visitor to visit with.
Throws:
VisitorException - if the visitor has a problem.


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