org.apache.pig.impl.plan
Interfaces 
PlanValidationExecutor
Classes 
CompilationMessageCollector
CompilationMessageCollector.Message
DependencyOrderWalker
DependencyOrderWalkerWOSeenChk
DepthFirstWalker
DotPlanDumper
MapKeysInfo
NodeIdGenerator
Operator
OperatorKey
OperatorPlan
OperatorPlan.IndexHelper
PlanDumper
PlanPrinter
PlanValidator
PlanVisitor
PlanWalker
ProjectionMap
ProjectionMap.Column
RequiredFields
ReverseDependencyOrderWalker
Enums 
CompilationMessageCollector.MessageType
Exceptions 
PlanException
PlanValidationException
VisitorException