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

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.POLimit
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>

public class POLimit
extends PhysicalOperator

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
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
POLimit(OperatorKey k)
           
POLimit(OperatorKey k, int rp)
           
POLimit(OperatorKey k, int rp, List<PhysicalOperator> inputs)
           
POLimit(OperatorKey k, List<PhysicalOperator> inputs)
           
 
Method Summary
 long getLimit()
           
 Result getNext(Tuple t)
          Counts the number of tuples processed into static variable soFar, if the number of tuples processed reach the limit, return EOP; Otherwise, return the tuple
 String name()
           
 void setLimit(long limit)
           
 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

POLimit

public POLimit(OperatorKey k)

POLimit

public POLimit(OperatorKey k,
               int rp)

POLimit

public POLimit(OperatorKey k,
               List<PhysicalOperator> inputs)

POLimit

public POLimit(OperatorKey k,
               int rp,
               List<PhysicalOperator> inputs)
Method Detail

setLimit

public void setLimit(long limit)

getLimit

public long getLimit()

getNext

public Result getNext(Tuple t)
               throws ExecException
Counts the number of tuples processed into static variable soFar, if the number of tuples processed reach the limit, return EOP; Otherwise, return the tuple

Overrides:
getNext in class PhysicalOperator
Throws:
ExecException

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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