org.apache.pig.impl.logicalLayer
Class LOConst

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


Copyright © ${year} The Apache Software Foundation