org.apache.pig.newplan.logical.rules
Class LimitOptimizer

java.lang.Object
  org.apache.pig.newplan.optimizer.Rule
      org.apache.pig.newplan.logical.rules.LimitOptimizer

public class LimitOptimizer
extends Rule

Nested Class Summary

class

LimitOptimizer.OptimizeLimitTransformer

Field Summary

Fields inherited from class org.apache.pig.newplan.optimizer.Rule

currentPlan, log, name, pattern

Constructor Summary

LimitOptimizer(String name)

Method Summary

protected OperatorPlan	buildPattern() Build the pattern that this rule will look for
Transformer	getNewTransformer() Get the transformer for this rule.

Methods inherited from class org.apache.pig.newplan.optimizer.Rule

getName, getPattern, isMandatory, isSkipListener, match, setSkipListener

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LimitOptimizer

public LimitOptimizer(String name)

Method Detail

buildPattern

protected OperatorPlan buildPattern()

Description copied from class: Rule

Build the pattern that this rule will look for

Specified by:

buildPattern in class Rule

Returns:

the pattern to look for by this rule

getNewTransformer

public Transformer getNewTransformer()

Description copied from class: Rule

Get the transformer for this rule. Abstract because the rule may want to choose how to instantiate the transformer. This should never return a cached transformer, it should always return a fresh one with no state.

Specified by:

getNewTransformer in class Rule

Returns:

Transformer to use with this rule