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java.lang.Objectorg.apache.pig.impl.plan.Operator<LOVisitor>
org.apache.pig.impl.logicalLayer.LogicalOperator
org.apache.pig.impl.logicalLayer.RelationalOperator
org.apache.pig.impl.logicalLayer.LOLimit
public class LOLimit
Field Summary |
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Fields inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator |
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mAlias, mIsProjectionMapComputed, mIsSchemaComputed, mPlan, mProjectionMap, mRequestedParallelism, mSchema, mType |
Fields inherited from class org.apache.pig.impl.plan.Operator |
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mKey |
Constructor Summary | |
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LOLimit(LogicalPlan plan,
OperatorKey k,
long limit)
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Method Summary | |
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protected Object |
clone()
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LOLimit |
duplicate()
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LogicalOperator |
getInput()
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long |
getLimit()
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ProjectionMap |
getProjectionMap()
Produce a map describing how this operator modifies its projection. |
List<RequiredFields> |
getRelevantInputs(int output,
int column)
Get relevant input columns of a particular output column. |
List<RequiredFields> |
getRequiredFields()
Get a list of fields that this operator requires. |
Schema |
getSchema()
Get a copy of the schema for the output of this operator. |
byte |
getType()
Get the type of this operator. |
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(LOVisitor v)
Visit this node with the provided visitor. |
Methods inherited from class org.apache.pig.impl.logicalLayer.RelationalOperator |
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regenerateProjectionMap, unsetProjectionMap |
Methods inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator |
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forceSchema, getAlias, getOperatorKey, getPlan, getRequestedParallelism, reconcileSchema, regenerateSchema, setAlias, setCanonicalNames, setPlan, setRequestedParallelism, setSchema, setSchemaComputed, setType, toString, unsetSchema |
Methods inherited from class org.apache.pig.impl.plan.Operator |
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compareTo, equals, hashCode, rewire |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public LOLimit(LogicalPlan plan, OperatorKey k, long limit)
plan
- Logical plan this operator is a part of.k
- Operator key to assign to this node.limit
- Number of limited outputsMethod Detail |
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public LogicalOperator getInput()
public long getLimit()
public void setLimit(long limit)
public Schema getSchema() throws FrontendException
LogicalOperator
getSchema
in class LogicalOperator
FrontendException
public String name()
name
in class Operator<LOVisitor>
public boolean supportsMultipleInputs()
Operator
supportsMultipleInputs
in class Operator<LOVisitor>
public boolean supportsMultipleOutputs()
Operator
supportsMultipleOutputs
in class LogicalOperator
public void visit(LOVisitor v) throws VisitorException
LogicalOperator
visit
in class LogicalOperator
v
- Visitor to visit with.
VisitorException
- if the visitor has a problem.public byte getType()
LogicalOperator
getType
in class LogicalOperator
public LOLimit duplicate()
protected Object clone() throws CloneNotSupportedException
clone
in class LogicalOperator
CloneNotSupportedException
Do not use the clone method directly. Operators are cloned when logical plans
are cloned using {@link LogicalPlanCloner}
public ProjectionMap getProjectionMap()
RelationalOperator
getProjectionMap
in class RelationalOperator
public List<RequiredFields> getRequiredFields()
RelationalOperator
getRequiredFields
in class RelationalOperator
public List<RequiredFields> getRelevantInputs(int output, int column)
RelationalOperator
getRelevantInputs
in class RelationalOperator
output
- output index. Only LOSplit have output other than 0 currentlycolumn
- output column
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