org.apache.pig.impl.plan.optimizer
Class RuleMatcher<O extends Operator,P extends OperatorPlan<O>>
java.lang.Object
org.apache.pig.impl.plan.optimizer.RuleMatcher<O,P>
public class RuleMatcher<O extends Operator,P extends OperatorPlan<O>>
- extends Object
RuleMatcher contains the logic to determine whether a given rule matches.
This alone does not mean the rule will be applied. Transformer.check()
still has to pass before Transfomer.transform() is called.
Method Summary |
boolean |
match(Rule<O,P> rule)
Test a rule to see if it matches the current plan. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
RuleMatcher
public RuleMatcher()
match
public boolean match(Rule<O,P> rule)
throws OptimizerException
- Test a rule to see if it matches the current plan. Save all matched nodes using BFS
- Parameters:
rule
- Rule to test for a match.
- Returns:
- true if the plan matches.
- Throws:
OptimizerException
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