org.apache.pig.newplan.logical.expression

Class ColumnExpression

java.lang.Object

org.apache.pig.newplan.Operator

org.apache.pig.newplan.logical.expression.LogicalExpression

org.apache.pig.newplan.logical.expression.ColumnExpression

Direct Known Subclasses:

ConstantExpression, DereferenceExpression, MapLookupExpression, ProjectExpression

public abstract class ColumnExpression
extends LogicalExpression

Super class for all column expressions, including projection, constants, and deferences.

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

Constructors

Constructor and Description
ColumnExpression(String name, OperatorPlan plan)

Method Summary

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

deepCopy, getFieldSchema, getNextUid, getType, hasFieldSchema, 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

ColumnExpression

public ColumnExpression(String name,
                        OperatorPlan plan)

Parameters:

name - of the operator

plan - LogicalExpressionPlan this column expression is part of