org.apache.pig.impl.builtin

Class IsFirstReduceOfKey

java.lang.Object

org.apache.pig.EvalFunc<Boolean>

org.apache.pig.impl.builtin.IsFirstReduceOfKey

Direct Known Subclasses:

IsFirstReduceOfKeyTez

public class IsFirstReduceOfKey
extends EvalFunc<Boolean>

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

EvalFunc.SchemaType

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<Object,Pair<Integer,Integer>>	reducerMap
protected static TupleFactory	tf

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
IsFirstReduceOfKey()

Method Summary

Methods

Modifier and Type	Method and Description
Boolean	exec(Tuple input) This callback method must be implemented by all subclasses.
protected void	init()

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, outputSchema, progress, setEndOfAllInput, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tf

protected static final TupleFactory tf

reducerMap

protected Map<Object,Pair<Integer,Integer>> reducerMap

Constructor Detail

IsFirstReduceOfKey

public IsFirstReduceOfKey()

Method Detail

init

protected void init()

exec

public Boolean exec(Tuple input)
             throws IOException

Description copied from class: EvalFunc

This callback method must be implemented by all subclasses. This is the method that will be invoked on every Tuple of a given dataset. Since the dataset may be divided up in a variety of ways the programmer should not make assumptions about state that is maintained between invocations of this method.

Specified by:

exec in class EvalFunc<Boolean>

Parameters:

input - the Tuple to be processed.

Returns:

result, of type T.

Throws:

IOException