org.apache.pig.newplan.logical.relational

Class LORank

java.lang.Object

org.apache.pig.newplan.Operator

org.apache.pig.newplan.logical.relational.LogicalRelationalOperator

org.apache.pig.newplan.logical.relational.LORank

public class LORank
extends LogicalRelationalOperator

RANK operator implementation. Operator Syntax:

  alias = RANK rel ( BY (col_ref) (ASC|DESC)? ( DENSE )? )?;
 alias - output alias
 RANK - operator
 rel - input relation
 BY - operator
 col_ref - STAR or Column References or a range in the schema of rel
 DENSE - dense rank means a sequential value without gasp among different tuple values.
 

Field Summary

Fields inherited from class org.apache.pig.newplan.logical.relational.LogicalRelationalOperator

alias, lineNum, mCustomPartitioner, mPinnedOptions, requestedParallelism, schema

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

annotations, hashPrime, location, name, plan

Constructor Summary

Constructors

Constructor and Description
LORank(OperatorPlan plan)
LORank(OperatorPlan plan, List<LogicalExpressionPlan> rankColPlans, List<Boolean> ascCols)

Method Summary

Modifier and Type	Method and Description
void	accept(PlanVisitor v) Accept a visitor at this node in the graph.
List<Boolean>	getAscendingCol()
List<LogicalExpressionPlan>	getRankColPlans()
LogicalSchema	getSchema() Get the schema for the output of LORank.
boolean	isDenseRank() Get if it is a dense RANK BY
boolean	isEqual(Operator other) This is like a shallow equals comparison.
boolean	isRowNumber() Get if it is a simple RANK operation.
void	setAscendingCol(List<Boolean> ascCols)
void	setIsDenseRank(boolean isDenseRank) Set if it is a dense RANK BY
void	setIsRowNumber(boolean rowNumber) Set if it is a simple RANK operation.
void	setRankColPlan(List<LogicalExpressionPlan> rankColPlans)

Methods inherited from class org.apache.pig.newplan.logical.relational.LogicalRelationalOperator

checkEquality, fixDuplicateUids, getAlias, getCustomPartitioner, getLineNumber, getRequestedParallelism, isPinnedOption, neverUseForRealSetSchema, pinOption, resetSchema, resetUid, setAlias, setCustomPartitioner, setRequestedParallelism, setSchema, toString

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

annotate, getAnnotation, getLocation, getName, getPlan, removeAnnotation, setLocation, setPlan

Methods inherited from class java.lang.Object

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

Constructor Detail

LORank

public LORank(OperatorPlan plan)

LORank

public LORank(OperatorPlan plan,
              List<LogicalExpressionPlan> rankColPlans,
              List<Boolean> ascCols)

Method Detail

getRankColPlans

public List<LogicalExpressionPlan> getRankColPlans()

setRankColPlan

public void setRankColPlan(List<LogicalExpressionPlan> rankColPlans)

getAscendingCol

public List<Boolean> getAscendingCol()

setAscendingCol

public void setAscendingCol(List<Boolean> ascCols)

getSchema

public LogicalSchema getSchema()
                        throws FrontendException

Get the schema for the output of LORank. Composed by long value prepended to the rest of the input schema

Specified by:

getSchema in class LogicalRelationalOperator

Returns:

the schema

Throws:

FrontendException

accept

public void accept(PlanVisitor v)
            throws FrontendException

Description copied from class: Operator

Accept a visitor at this node in the graph.

Specified by:

accept in class Operator

Parameters:

v - Visitor to accept.

Throws:

FrontendException

isEqual

public boolean isEqual(Operator other)
                throws FrontendException

Description copied from class: Operator

This is like a shallow equals comparison. It returns true if two operators have equivalent properties even if they are different objects. Here properties mean equivalent plan and equivalent name.

Specified by:

isEqual in class Operator

Returns:

true if two object have equivalent properties, else false

Throws:

FrontendException

isDenseRank

public boolean isDenseRank()

Get if it is a dense RANK BY

Returns:

boolean

setIsDenseRank

public void setIsDenseRank(boolean isDenseRank)

Set if it is a dense RANK BY

Parameters:

isDenseRank - if is dense rank or not

isRowNumber

public boolean isRowNumber()

Get if it is a simple RANK operation. Which means a row number attached to each tuple.

Returns:

boolean

setIsRowNumber

public void setIsRowNumber(boolean rowNumber)

Set if it is a simple RANK operation.

Parameters:

rowNumber - if is a row number operation