org.apache.pig.newplan.logical.rules

Class PredicatePushdownOptimizer

java.lang.Object

org.apache.pig.newplan.optimizer.Rule

org.apache.pig.newplan.logical.rules.PredicatePushdownOptimizer

public class PredicatePushdownOptimizer
extends Rule

Field Summary

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

currentPlan, log, name, pattern

Constructor Summary

Constructors

Constructor and Description
PredicatePushdownOptimizer(java.lang.String name)

Method Summary

Methods

Modifier and Type	Method and Description
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

PredicatePushdownOptimizer

public PredicatePushdownOptimizer(java.lang.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