org.apache.pig.impl.logicalLayer
Class LOCast

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

public class LOCast
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, mIsSchemaComputed, mPlan, mRequestedParallelism, mSchema, mType
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
LOCast(LogicalPlan plan, OperatorKey k, ExpressionOperator expr, byte type)
           
 
Method Summary
protected  Object clone()
           
 ExpressionOperator getExpression()
           
 Schema.FieldSchema getFieldSchema()
           
 FuncSpec getLoadFuncSpec()
           
 Schema getSchema()
          Get a copy of the schema for the output of this operator.
 String name()
           
 void setExpression(ExpressionOperator expr)
           
 void setLoadFuncSpec(FuncSpec loadFuncSpec)
           
 boolean supportsMultipleInputs()
          Indicates whether this operator supports multiple inputs.
 void visit(LOVisitor v)
          Visit this node with the provided visitor.
 
Methods inherited from class org.apache.pig.impl.logicalLayer.ExpressionOperator
getType, regenerateFieldSchema, setFieldSchema, supportsMultipleOutputs, unsetFieldSchema
 
Methods inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator
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
compareTo, equals, hashCode
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

LOCast

public LOCast(LogicalPlan plan,
              OperatorKey k,
              ExpressionOperator expr,
              byte type)
Parameters:
plan - Logical plan this operator is a part of.
k - Operator key to assign to this node.
expr - the expression whose type has to be cast
type - the type to which the expression is cast
Method Detail

getExpression

public ExpressionOperator getExpression()

setExpression

public void setExpression(ExpressionOperator expr)

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.

getLoadFuncSpec

public FuncSpec getLoadFuncSpec()

setLoadFuncSpec

public void setLoadFuncSpec(FuncSpec loadFuncSpec)

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}


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