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

java.lang.Object
  extended by org.apache.pig.newplan.Operator
      extended by org.apache.pig.newplan.logical.relational.LogicalRelationalOperator
          extended by 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)


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