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package org.apache.pig.newplan.logical.expression;
Superclass for all unary expressions
public abstract class UnaryExpression extends LogicalExpression {
Will add this operator to the plan and connect it to the left and right hand side operators.

name of the operator
plan plan this operator is part of
exp expression that this expression operators on
    public UnaryExpression(String name,
                            OperatorPlan plan,
                            LogicalExpression exp) {

Get the expression that this unary expression operators on.

expression on the left hand side
    public LogicalExpression getExpression() throws FrontendException {
        List<Operatorpreds = .getSuccessors(this);
        if(preds == null) {
            return null;
        return (LogicalExpression)preds.get(0);
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