Package org.apache.pig.impl.plan

Class Summary

Class	Description
CompilationMessageCollector	This class is used for collecting all messages (error + warning) in compilation process.
CompilationMessageCollector.Message
DependencyOrderWalker<O extends Operator,P extends OperatorPlan<O>>	DependencyOrderWalker traverses the graph in such a way that no node is visited before all the nodes it depends on have been visited.
DepthFirstWalker<O extends Operator,P extends OperatorPlan<O>>	DepthFirstWalker traverses a plan in a depth first manner.
DotPlanDumper<E extends Operator,P extends OperatorPlan<E>,N extends Operator,S extends OperatorPlan<N>>	This class puts everything that is needed to dump a plan in a format readable by graphviz's dot algorithm.
MapKeysInfo
NodeIdGenerator	Generates IDs as long values in a thread safe manner.
Operator<V extends PlanVisitor>	Base class for all types of operators.
OperatorKey
OperatorPlan<E extends Operator>	A generic graphing class for use by LogicalPlan, PhysicalPlan, etc.
OperatorPlan.IndexHelper<E>
PlanDumper<E extends Operator,P extends OperatorPlan<E>,S extends OperatorPlan<? extends Operator>>	This class dumps a nested plan to a print stream.
PlanVisitor<O extends Operator,P extends OperatorPlan<O>>	A visitor mechanism for navigating and operating on a plan of Operators.
PlanWalker<O extends Operator,P extends OperatorPlan<O>>	PlanWalker encapsulates the logic to traverse a plan.
ProjectionMap	A struct detailing how a projection is altered by an operator.
ProjectionMap.Column	A wrapper for projection map columns to contain the input number, input column.
RequiredFields	A struct detailing how a projection is altered by an operator.
ReverseDependencyOrderWalker<O extends Operator,P extends OperatorPlan<O>>	ReverseDependencyOrderWalker traverses the graph in such a way that no node is visited before all the nodes that are its successors on have been visited.

Enum Summary

Enum	Description
CompilationMessageCollector.MessageType
CompilationMessageCollector.Unknown

Exception Summary

Exception	Description
PlanException
PlanValidationException
VisitorException