org.apache.pig.impl.logicalLayer
Class LOConst

java.lang.Object
  org.apache.pig.impl.plan.Operator<LOVisitor>
      org.apache.pig.impl.logicalLayer.LogicalOperator
          org.apache.pig.impl.logicalLayer.ExpressionOperator
              org.apache.pig.impl.logicalLayer.LOConst

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Operator>

public class LOConst
extends ExpressionOperator

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.pig.impl.logicalLayer.ExpressionOperator

mFieldSchema, mIsFieldSchemaComputed

Fields inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator

mAlias, mCustomPartitioner, mIsProjectionMapComputed, mIsSchemaComputed, mPinnedOptions, mPlan, mProjectionMap, mRequestedParallelism, mSchema, mType

Fields inherited from class org.apache.pig.impl.plan.Operator

mKey

Constructor Summary

LOConst(LogicalPlan plan, OperatorKey k, Object value)

Method Summary

protected Object	clone()
Schema.FieldSchema	getFieldSchema()
Schema	getSchema() Get a copy of the schema for the output of this operator.
Object	getValue()
String	name()
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.ExpressionOperator

getType, regenerateFieldSchema, setFieldSchema, unsetFieldSchema

Methods inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator

forceSchema, getAlias, getAliasString, getCustomPartitioner, getOperatorKey, getPlan, getRequestedParallelism, isPinnedOption, pinOption, reconcileSchema, regenerateSchema, setAlias, setCanonicalNames, setCustomPartitioner, setParent, setPlan, setRequestedParallelism, setSchema, setSchemaComputed, setType, toString, unsetSchema

Methods inherited from class org.apache.pig.impl.plan.Operator

compareTo, equals, getProjectionMap, hashCode, regenerateProjectionMap, rewire, unsetProjectionMap

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

LOConst

public LOConst(LogicalPlan plan,
               OperatorKey k,
               Object value)

Parameters:

plan - Logical plan this operator is a part of.

k - Operator key to assign to this node.

value - the value of the constant

Method Detail

getValue

public Object getValue()

visit

public void visit(LOVisitor v)
           throws VisitorException

Description copied from class: LogicalOperator

Visit this node with the provided visitor. This should only be called by the visitor class itself, never directly.

Specified by:

visit in class LogicalOperator

Parameters:

v - Visitor to visit with.

Throws:

VisitorException - if the visitor has a problem.

getSchema

public Schema getSchema()

Description copied from class: LogicalOperator

Get a copy of the schema for the output of this operator.

Overrides:

getSchema in class ExpressionOperator

getFieldSchema

public Schema.FieldSchema getFieldSchema()
                                  throws FrontendException

Overrides:

getFieldSchema in class ExpressionOperator

Throws:

FrontendException

name

public String name()

Specified by:

name in class Operator<LOVisitor>

supportsMultipleInputs

public boolean supportsMultipleInputs()

Description copied from class: Operator

Indicates whether this operator supports multiple inputs.

Specified by:

supportsMultipleInputs in class Operator<LOVisitor>

Returns:

true if it does, otherwise false.

supportsMultipleOutputs

public boolean supportsMultipleOutputs()

Description copied from class: Operator

Indicates whether this operator supports multiple outputs.

Overrides:

supportsMultipleOutputs in class ExpressionOperator

Returns:

true if it does, otherwise false.

clone

protected Object clone()
                throws CloneNotSupportedException

Overrides:

clone in class ExpressionOperator

Throws:

CloneNotSupportedException

See Also:

Do not use the clone method directly. Operators are cloned when logical plans are cloned using {@link LogicalPlanCloner}