org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators
Class POLimit
java.lang.Object
org.apache.pig.impl.plan.Operator<PhyPlanVisitor>
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
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
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 |
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 |
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)
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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