org.apache.pig.newplan.logical.expression
Class UnaryExpression

java.lang.Object
  org.apache.pig.newplan.Operator
      org.apache.pig.newplan.logical.expression.LogicalExpression
          org.apache.pig.newplan.logical.expression.UnaryExpression

Direct Known Subclasses:

CastExpression, IsNullExpression, NegativeExpression, NotExpression

public abstract class UnaryExpression
extends LogicalExpression

Superclass for all unary expressions

Field Summary

Fields inherited from class org.apache.pig.newplan.logical.expression.LogicalExpression

fieldSchema, uidOnlyFieldSchema

Fields inherited from class org.apache.pig.newplan.Operator

annotations, hashPrime, location, name, plan

Constructor Summary

UnaryExpression(String name, OperatorPlan plan, LogicalExpression exp)
Will add this operator to the plan and connect it to the left and right hand side operators.

Method Summary

LogicalExpression

getExpression() Get the expression that this unary expression operators on.

Methods inherited from class org.apache.pig.newplan.logical.expression.LogicalExpression

deepCopy, getFieldSchema, getNextUid, getType, neverUseForRealSetFieldSchema, resetFieldSchema, resetNextUid, resetUid, toString

Methods inherited from class org.apache.pig.newplan.Operator

accept, annotate, getAnnotation, getLocation, getName, getPlan, isEqual, removeAnnotation, setLocation, setPlan

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

UnaryExpression

public UnaryExpression(String name,
                       OperatorPlan plan,
                       LogicalExpression exp)

Will add this operator to the plan and connect it to the left and right hand side operators.

Parameters:

name - of the operator

plan - plan this operator is part of

exp - expression that this expression operators on

Method Detail

getExpression

public LogicalExpression getExpression()
                                throws FrontendException

Get the expression that this unary expression operators on.

Returns:

expression on the left hand side

Throws:

FrontendException