org.apache.pig.impl.eval
Class GenerateSpec

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

public class GenerateSpec
extends EvalSpec

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.pig.impl.eval.EvalSpec
EvalSpec.UserComparator
 
Field Summary
protected  int driver
           
protected  List<EvalSpec> specs
           
 
Fields inherited from class org.apache.pig.impl.eval.EvalSpec
inner, properties
 
Constructor Summary
GenerateSpec(EvalSpec col)
           
GenerateSpec(List<EvalSpec> specs)
           
 
Method Summary
 List<String> getFuncs()
          Get the functions required by this spec
 GenerateSpec getGroupBySpec()
           
 List<EvalSpec> getSpecs()
           
 void instantiateFunc(FunctionInstantiator instantiaor)
           
 boolean isAsynchronous()
          Some specs may be asynchronous, i.e., they return before completing the processing fully.
protected  TupleSchema mapInputSchema(Schema input)
          Given an input schema, determine the output schema of this spec as it operates on input tuples with the input schema.
protected  DataCollector setupDefaultPipe(Properties properties, DataCollector endOfPipe)
          set up a default data processing pipe for processing by this spec This pipe does not include unflattening/flattening at the end
 String toString()
           
 void visit(EvalSpecVisitor v)
           
 
Methods inherited from class org.apache.pig.impl.eval.EvalSpec
addSpec, copy, finish, getCombiner, getComparator, getComparatorName, getLineage, getOutputSchemaForPipe, getProperties, 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

specs

protected List<EvalSpec> specs

driver

protected int driver
Constructor Detail

GenerateSpec

public GenerateSpec(List<EvalSpec> specs)

GenerateSpec

public GenerateSpec(EvalSpec col)
Method Detail

getGroupBySpec

public GenerateSpec getGroupBySpec()

setupDefaultPipe

protected DataCollector setupDefaultPipe(Properties properties,
                                         DataCollector endOfPipe)
Description copied from class: EvalSpec
set up a default data processing pipe for processing by this spec This pipe does not include unflattening/flattening at the end

Specified by:
setupDefaultPipe in class EvalSpec
Parameters:
properties - properties for the pipe
endOfPipe - The collector where output is desired
Returns:
The collector where input tuples should be put

toString

public String toString()
Overrides:
toString in class Object

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 TupleSchema mapInputSchema(Schema input)
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:

isAsynchronous

public boolean isAsynchronous()
Description copied from class: EvalSpec
Some specs may be asynchronous, i.e., they return before completing the processing fully. The default value is false, may be overridden to return true

Overrides:
isAsynchronous in class EvalSpec

instantiateFunc

public void instantiateFunc(FunctionInstantiator instantiaor)
                     throws IOException
Overrides:
instantiateFunc in class EvalSpec
Throws:
IOException

getSpecs

public List<EvalSpec> getSpecs()

visit

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


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