org.apache.pig.newplan.logical.relational
Class LOJoin

java.lang.Object
  org.apache.pig.newplan.Operator
      org.apache.pig.newplan.logical.relational.LogicalRelationalOperator
          org.apache.pig.newplan.logical.relational.LOJoin

public class LOJoin
extends LogicalRelationalOperator

Nested Class Summary

static class

LOJoin.JOINTYPE Enum for the type of join

Field Summary

static Integer

OPTION_JOIN static constant to refer to the option of selecting a join type

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

LOJoin(LogicalPlan plan)

LOJoin(LogicalPlan plan, MultiMap<Integer,LogicalExpressionPlan> joinPlans, LOJoin.JOINTYPE jt, boolean[] isInner)

Method Summary

void	accept(PlanVisitor v) Accept a visitor at this node in the graph.
MultiMap<Integer,LogicalExpressionPlan>	getExpressionPlans() Get all of the expressions plans that are in this join.
Collection<LogicalExpressionPlan>	getExpressionPlanValues()
boolean[]	getInnerFlags()
List<Operator>	getInputs(LogicalPlan plan)
Collection<LogicalExpressionPlan>	getJoinPlan(int inputIndex)
LOJoin.JOINTYPE	getJoinType()
LogicalSchema	getSchema() Get the schema for the output of this relational operator.
boolean	isEqual(Operator other) This is like a shallow equals comparison.
boolean	isInner(int inputIndex)
void	resetJoinType()
void	setInnerFlags(boolean[] isInner)
void	setJoinPlans(MultiMap<Integer,LogicalExpressionPlan> joinPlans)
void	setJoinType(LOJoin.JOINTYPE jt)

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

checkEquality, getAlias, getCustomPartitioner, getLineNumber, getRequestedParallelisam, 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

Field Detail

OPTION_JOIN

public static final Integer OPTION_JOIN

static constant to refer to the option of selecting a join type

Constructor Detail

LOJoin

public LOJoin(LogicalPlan plan)

LOJoin

public LOJoin(LogicalPlan plan,
              MultiMap<Integer,LogicalExpressionPlan> joinPlans,
              LOJoin.JOINTYPE jt,
              boolean[] isInner)

Method Detail

setJoinPlans

public void setJoinPlans(MultiMap<Integer,LogicalExpressionPlan> joinPlans)

setInnerFlags

public void setInnerFlags(boolean[] isInner)

setJoinType

public void setJoinType(LOJoin.JOINTYPE jt)

isInner

public boolean isInner(int inputIndex)

getInnerFlags

public boolean[] getInnerFlags()

getJoinType

public LOJoin.JOINTYPE getJoinType()

resetJoinType

public void resetJoinType()

getJoinPlan

public Collection<LogicalExpressionPlan> getJoinPlan(int inputIndex)

getExpressionPlans

public MultiMap<Integer,LogicalExpressionPlan> getExpressionPlans()

Get all of the expressions plans that are in this join.

Returns:

collection of all expression plans.

getExpressionPlanValues

public Collection<LogicalExpressionPlan> getExpressionPlanValues()

getSchema

public LogicalSchema getSchema()
                        throws FrontendException

Description copied from class: LogicalRelationalOperator

Get the schema for the output of this relational operator. This does not merely return the schema variable. If schema is not yet set, this will attempt to construct it. Therefore it is abstract since each operator will need to construct its schema differently.

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

getInputs

public List<Operator> getInputs(LogicalPlan plan)