org.apache.hadoop.hive.ql.lib
Interface Rule

All Known Implementing Classes:

RuleRegExp

public interface Rule

Rule interface for Operators Used in operator dispatching to dispatch process/visitor functions for operators.

Method Summary

int	cost(Stack<Node> stack)
String	getName()

Method Detail

cost

int cost(Stack<Node> stack)
         throws SemanticException

Returns:

the cost of the rule - the lower the cost, the better the rule matches

Throws:

SemanticException

getName

String getName()

Returns:

the name of the rule - may be useful for debugging