org.apache.pig.newplan

Class PColFilterExtractor

java.lang.Object

org.apache.pig.newplan.PlanVisitor

org.apache.pig.newplan.PColFilterExtractor

Deprecated.

@Deprecated
public class PColFilterExtractor
extends PlanVisitor

This Visitor works on the filter condition of a LOFilter which immediately follows a LOLoad that interacts with a metadata system (currently OWL) to read table data. The visitor looks for conditions on partition columns in the filter condition and extracts those conditions out of the filter condition. The condition on partition cols will be used to prune partitions of the table.

Field Summary

Fields inherited from class org.apache.pig.newplan.PlanVisitor

currentWalker, DEFAULT_SCOPE, plan

Constructor Summary

Constructors

Constructor and Description
PColFilterExtractor(OperatorPlan plan, List<String> partitionCols) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	canPushDown() Deprecated.
Expression	getExpression(LogicalExpression op) Deprecated.
Expression	getPColCondition() Deprecated.
boolean	isFilterRemovable() Deprecated.
void	visit() Deprecated. Entry point for visiting the plan.
protected void	visit(ProjectExpression project) Deprecated.

Methods inherited from class org.apache.pig.newplan.PlanVisitor

getPlan, popWalker, pushWalker

Methods inherited from class java.lang.Object

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

Constructor Detail

PColFilterExtractor

public PColFilterExtractor(OperatorPlan plan,
                   List<String> partitionCols)

Deprecated.

Parameters:

plan - logical plan corresponding the filter's comparison condition

partitionCols - list of partition columns of the table which is being loaded in the LOAD statement which is input to the filter

Method Detail

visit

public void visit()
           throws FrontendException

Deprecated.

Description copied from class: PlanVisitor

Entry point for visiting the plan.

Overrides:

visit in class PlanVisitor

Throws:

VisitorException - if an error is encountered while visiting.

FrontendException

visit

protected void visit(ProjectExpression project)
              throws FrontendException

Deprecated.

Throws:

FrontendException

getPColCondition

public Expression getPColCondition()

Deprecated.

Returns:

the condition on partition columns extracted from filter

isFilterRemovable

public boolean isFilterRemovable()

Deprecated.

Returns:

the filterRemovable

getExpression

public Expression getExpression(LogicalExpression op)
                         throws FrontendException

Deprecated.

Throws:

FrontendException

canPushDown

public boolean canPushDown()

Deprecated.