org.apache.pig.impl.eval
Class MapLookupSpec

java.lang.Object
  extended by org.apache.pig.impl.eval.EvalSpec
      extended by org.apache.pig.impl.eval.SimpleEvalSpec
          extended by org.apache.pig.impl.eval.MapLookupSpec
All Implemented Interfaces:
Serializable

public class MapLookupSpec
extends SimpleEvalSpec

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.pig.impl.eval.EvalSpec
EvalSpec.UserComparator
 
Field Summary
protected  String keyToLookup
           
 
Fields inherited from class org.apache.pig.impl.eval.EvalSpec
inner, properties
 
Constructor Summary
MapLookupSpec(String keyToLookup)
           
 
Method Summary
protected  Datum eval(Datum d)
           
 List<String> getFuncs()
          Get the functions required by this spec
 String key()
           
protected  Schema mapInputSchema(Schema schema)
          Given an input schema, determine the output schema of this spec as it operates on input tuples with the input schema.
 String toString()
           
 void visit(EvalSpecVisitor v)
           
 
Methods inherited from class org.apache.pig.impl.eval.SimpleEvalSpec
setupDefaultPipe
 
Methods inherited from class org.apache.pig.impl.eval.EvalSpec
addSpec, copy, finish, getCombiner, getComparator, getComparatorName, getLineage, getOutputSchemaForPipe, getProperties, instantiateFunc, isAsynchronous, isFlattened, isInner, setComparatorName, setFlatten, setInner, setLineageTracer, setSchema, setupPipe, simpleEval
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

keyToLookup

protected String keyToLookup
Constructor Detail

MapLookupSpec

public MapLookupSpec(String keyToLookup)
Method Detail

eval

protected Datum eval(Datum d)
Specified by:
eval in class SimpleEvalSpec

getFuncs

public List<String> getFuncs()
Description copied from class: EvalSpec
Get the functions required by this spec

Specified by:
getFuncs in class EvalSpec
Returns:

mapInputSchema

protected Schema mapInputSchema(Schema schema)
Description copied from class: EvalSpec
Given an input schema, determine the output schema of this spec as it operates on input tuples with the input schema.

Specified by:
mapInputSchema in class EvalSpec
Returns:

toString

public String toString()
Overrides:
toString in class Object

visit

public void visit(EvalSpecVisitor v)
Specified by:
visit in class EvalSpec

key

public String key()


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