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

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

public class LOUnion
extends LogicalRelationalOperator

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

LOUnion(OperatorPlan plan)

LOUnion(OperatorPlan plan, boolean onSchema)

Method Summary

void	accept(PlanVisitor v) Accept a visitor at this node in the graph.
List<Operator>	getInputs()
List<Operator>	getInputs(LogicalPlan plan)
Set<Long>	getInputUids(long uid)
LogicalSchema	getSchema() Get the schema for the output of this relational operator.
boolean	isEqual(Operator other) This is like a shallow equals comparison.
boolean	isOnSchema()
void	resetUid() Erase all cached uid, regenerate uid when we regenerating schema.
void	setUnionOnSchema(boolean flag)

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

checkEquality, getAlias, getCustomPartitioner, getLineNumber, getRequestedParallelisam, isPinnedOption, neverUseForRealSetSchema, pinOption, resetSchema, 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

LOUnion

public LOUnion(OperatorPlan plan)

LOUnion

public LOUnion(OperatorPlan plan,
               boolean onSchema)

Method Detail

isOnSchema

public boolean isOnSchema()

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

getInputUids

public Set<Long> getInputUids(long uid)

resetUid

public void resetUid()

Description copied from class: LogicalRelationalOperator

Erase all cached uid, regenerate uid when we regenerating schema. This process currently only used in ImplicitSplitInsert, which will insert split and invalidate some uids in plan

Overrides:

resetUid in class LogicalRelationalOperator

getInputs

public List<Operator> getInputs()

getInputs

public List<Operator> getInputs(LogicalPlan plan)

setUnionOnSchema

public void setUnionOnSchema(boolean flag)