public class TOP extends AccumulatorEvalFunc<DataBag> implements Algebraic
| Modifier and Type | Class and Description |
|---|---|
static class |
TOP.Final |
static class |
TOP.Initial |
static class |
TOP.Intermed |
EvalFunc.SchemaTypepigLogger, reporter, returnType| Modifier and Type | Method and Description |
|---|---|
void |
accumulate(Tuple tuple)
Pass tuples to the UDF.
|
void |
cleanup()
Called after getValue() to prepare processing for next key.
|
List<FuncSpec> |
getArgToFuncMapping()
Allow a UDF to specify type specific implementations of itself.
|
String |
getFinal()
Get the final function.
|
String |
getInitial()
Get the initial function.
|
String |
getIntermed()
Get the intermediate function.
|
DataBag |
getValue()
Called when all tuples from current key have been passed to accumulate.
|
Schema |
outputSchema(Schema input)
Report the schema of the output of this UDF.
|
protected static void |
updateTop(PriorityQueue<Tuple> store,
int limit,
DataBag inputBag) |
execallowCompileTimeCalculation, finish, getCacheFiles, getInputSchema, getLoadCaster, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, progress, setEndOfAllInput, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warnpublic TOP()
public TOP(String arg)
public void accumulate(Tuple tuple) throws IOException
Accumulatoraccumulate in interface Accumulator<DataBag>accumulate in class AccumulatorEvalFunc<DataBag>tuple - A tuple containing a single field, which is a bag. The bag will contain the set
of tuples being passed to the UDF in this iteration.IOExceptionpublic DataBag getValue()
AccumulatorgetValue in interface Accumulator<DataBag>getValue in class AccumulatorEvalFunc<DataBag>public void cleanup()
Accumulatorcleanup in interface Accumulator<DataBag>cleanup in class AccumulatorEvalFunc<DataBag>protected static void updateTop(PriorityQueue<Tuple> store, int limit, DataBag inputBag)
public List<FuncSpec> getArgToFuncMapping() throws FrontendException
EvalFuncgetArgToFuncMapping in class EvalFunc<DataBag>FrontendExceptionpublic Schema outputSchema(Schema input)
EvalFunc
The default implementation interprets the OutputSchema annotation,
if one is present. Otherwise, it returns null (no known output schema).
outputSchema in class EvalFunc<DataBag>input - Schema of the inputpublic String getInitial()
AlgebraicgetInitial in interface Algebraicpublic String getIntermed()
AlgebraicgetIntermed in interface AlgebraicCopyright © 2007-2017 The Apache Software Foundation