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

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