Package org.apache.hadoop.hive.ql.lib

Interface Summary

Interface	Description
SemanticDispatcher	Dispatcher interface for Operators Used in operator graph walking to dispatch process/visitor functions for operators.
SemanticGraphWalker	Interface for operator graph walker.
SemanticNodeProcessor	Base class for processing operators which is no-op.
SemanticRule	Rule interface for Operators Used in operator dispatching to dispatch process/visitor functions for operators.

Class Summary

Class	Description
CompositeProcessor	CompositeProcessor.
CostLessRuleDispatcher	Dispatches calls to relevant method in processor.
DefaultGraphWalker	base class for operator graph walker this class takes list of starting ops and walks them one by one.
DefaultRuleDispatcher	Dispatches calls to relevant method in processor.
ExpressionWalker	class for traversing tree This class assumes that the given node represents TREE and not GRAPH i.e.
ForwardWalker
LevelOrderWalker	This is a level-wise walker implementation which dispatches the node in the order that the node will only get dispatched after all the parents are dispatched.
PreOrderOnceWalker	Graph walker this class takes list of starting nodes and walks them in pre-order.
PreOrderWalker	base class for operator graph walker this class takes list of starting ops and walks them one by one.
RuleExactMatch	Implementation of the Rule interface for Nodes Used in Node dispatching to dispatch process/visitor functions for Nodes.
RuleRegExp	Rule interface for Nodes Used in Node dispatching to dispatch process/visitor functions for Nodes.
SubqueryExpressionWalker
TaskGraphWalker	base class for operator graph walker this class takes list of starting ops and walks them one by one.
TypeRule	Rule that matches a particular type of node.
Utils	Contains common utility functions to manipulate nodes, walkers etc.