org.apache.pig.impl.logicalLayer
Class LOMapLookup

java.lang.Object
  extended by org.apache.pig.impl.plan.Operator<LOVisitor>
      extended by org.apache.pig.impl.logicalLayer.LogicalOperator
          extended by org.apache.pig.impl.logicalLayer.ExpressionOperator
              extended by org.apache.pig.impl.logicalLayer.LOMapLookup
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>

public class LOMapLookup
extends ExpressionOperator

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.apache.pig.impl.logicalLayer.ExpressionOperator
mFieldSchema, mIsFieldSchemaComputed
 
Fields inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator
mAlias, mIsProjectionMapComputed, mIsSchemaComputed, mPlan, mProjectionMap, mRequestedParallelism, mSchema, mType
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
LOMapLookup(LogicalPlan plan, OperatorKey key, String mapKey, byte valueType, Schema valueSchema)
           
 
Method Summary
protected  Object clone()
           
 Schema.FieldSchema getFieldSchema()
           
 String getLookUpKey()
           
 ExpressionOperator getMap()
           
 Schema getSchema()
          Get a copy of the schema for the output of this operator.
 byte getValueType()
           
 String name()
           
 boolean supportsMultipleInputs()
          Indicates whether this operator supports multiple inputs.
 void visit(LOVisitor v)
          Visit this node with the provided visitor.
 
Methods inherited from class org.apache.pig.impl.logicalLayer.ExpressionOperator
getType, regenerateFieldSchema, setFieldSchema, supportsMultipleOutputs, unsetFieldSchema
 
Methods inherited from class org.apache.pig.impl.logicalLayer.LogicalOperator
forceSchema, getAlias, getOperatorKey, getPlan, getRequestedParallelism, reconcileSchema, regenerateSchema, setAlias, setCanonicalNames, setPlan, setRequestedParallelism, setSchema, setSchemaComputed, setType, toString, unsetSchema
 
Methods inherited from class org.apache.pig.impl.plan.Operator
compareTo, equals, getProjectionMap, hashCode, regenerateProjectionMap, rewire, unsetProjectionMap
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

LOMapLookup

public LOMapLookup(LogicalPlan plan,
                   OperatorKey key,
                   String mapKey,
                   byte valueType,
                   Schema valueSchema)
            throws org.apache.pig.impl.logicalLayer.parser.ParseException
Parameters:
plan - Logical plan this operator is a part of.
key - Operator key to assign to this node.
mapKey - key to look up in the map. The key is of atomic type
valueType - type of the value corresponding to the key
valueSchema - schema of the value if the type is tuple
Throws:
org.apache.pig.impl.logicalLayer.parser.ParseException
Method Detail

getMap

public ExpressionOperator getMap()

getLookUpKey

public String getLookUpKey()

getValueType

public byte getValueType()

name

public String name()
Specified by:
name in class Operator<LOVisitor>

supportsMultipleInputs

public boolean supportsMultipleInputs()
Description copied from class: Operator
Indicates whether this operator supports multiple inputs.

Specified by:
supportsMultipleInputs in class Operator<LOVisitor>
Returns:
true if it does, otherwise false.

getSchema

public Schema getSchema()
Description copied from class: LogicalOperator
Get a copy of the schema for the output of this operator.

Overrides:
getSchema in class ExpressionOperator

getFieldSchema

public Schema.FieldSchema getFieldSchema()
                                  throws FrontendException
Overrides:
getFieldSchema in class ExpressionOperator
Throws:
FrontendException

visit

public void visit(LOVisitor v)
           throws VisitorException
Description copied from class: LogicalOperator
Visit this node with the provided visitor. This should only be called by the visitor class itself, never directly.

Specified by:
visit in class LogicalOperator
Parameters:
v - Visitor to visit with.
Throws:
VisitorException - if the visitor has a problem.

clone

protected Object clone()
                throws CloneNotSupportedException
Overrides:
clone in class ExpressionOperator
Throws:
CloneNotSupportedException
See Also:
Do not use the clone method directly. Operators are cloned when logical plans are cloned using {@link LogicalPlanCloner}


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