org.apache.pig.experimental.logical.expression
Class IsNullExpression

java.lang.Object
  extended by org.apache.pig.experimental.plan.Operator
      extended by org.apache.pig.experimental.logical.expression.LogicalExpression
          extended by org.apache.pig.experimental.logical.expression.UnaryExpression
              extended by org.apache.pig.experimental.logical.expression.IsNullExpression

public class IsNullExpression
extends UnaryExpression


Field Summary
 
Fields inherited from class org.apache.pig.experimental.logical.expression.LogicalExpression
type, uid
 
Fields inherited from class org.apache.pig.experimental.plan.Operator
annotations, hashPrime, name, plan
 
Constructor Summary
IsNullExpression(OperatorPlan plan, byte b, LogicalExpression exp)
           
 
Method Summary
 void accept(PlanVisitor v)
          Accept a visitor at this node in the graph.
 boolean isEqual(Operator other)
          This is like a shallow equals comparison.
 
Methods inherited from class org.apache.pig.experimental.logical.expression.UnaryExpression
getExpression
 
Methods inherited from class org.apache.pig.experimental.logical.expression.LogicalExpression
getNextUid, getType, getUid, neverUseForRealSetUid, resetNextUid, setUid, toString
 
Methods inherited from class org.apache.pig.experimental.plan.Operator
annotate, getAnnotation, getName, getPlan, removeAnnotation
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

IsNullExpression

public IsNullExpression(OperatorPlan plan,
                        byte b,
                        LogicalExpression exp)
Method Detail

accept

public void accept(PlanVisitor v)
            throws IOException
Description copied from class: Operator
Accept a visitor at this node in the graph.

Specified by:
accept in class Operator
Parameters:
v - Visitor to accept.
Throws:
IOException

isEqual

public boolean isEqual(Operator other)
Description copied from class: Operator
This is like a shallow equals comparison. It returns true if two operators have equivalent properties even if they are different objects. Here properties mean equivalent plan and equivalent name.

Specified by:
isEqual in class Operator
Returns:
true if two object have equivalent properties, else false


Copyright © ${year} The Apache Software Foundation