org.apache.datasketches.pig.cpc

Class AlgebraicInitial

java.lang.Object

org.apache.pig.EvalFunc<org.apache.pig.data.Tuple>

org.apache.datasketches.pig.cpc.AlgebraicInitial

public class AlgebraicInitial
extends org.apache.pig.EvalFunc<org.apache.pig.data.Tuple>

Class used to calculate the initial pass of an Algebraic sketch operation.

The Initial class simply passes through all records unchanged so that they can be processed by the intermediate processor instead.

Author:

Alexander Saydakov

Nested Class Summary

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

org.apache.pig.EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
AlgebraicInitial() Default constructor for the initial pass of an Algebraic function.
AlgebraicInitial(String lgK) Constructor for the initial pass of an Algebraic function.
AlgebraicInitial(String lgK, String seed) Constructor for the initial pass of an Algebraic function.

Method Summary

Modifier and Type	Method and Description
org.apache.pig.data.Tuple	exec(org.apache.pig.data.Tuple inputTuple)

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLoadCaster, 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

Constructor Detail

AlgebraicInitial

public AlgebraicInitial()

Default constructor for the initial pass of an Algebraic function.

AlgebraicInitial

public AlgebraicInitial(String lgK)

Constructor for the initial pass of an Algebraic function. Pig will call this and pass the same constructor arguments as the original UDF. In this case the arguments are ignored.

Parameters:

lgK - in a form of a String

AlgebraicInitial

public AlgebraicInitial(String lgK,
                        String seed)

Constructor for the initial pass of an Algebraic function. Pig will call this and pass the same constructor arguments as the original UDF. In this case the arguments are ignored.

Parameters:

lgK - in a form of a String

seed - in a form of a String

Method Detail

exec

public org.apache.pig.data.Tuple exec(org.apache.pig.data.Tuple inputTuple)
                               throws IOException

Specified by:

exec in class org.apache.pig.EvalFunc<org.apache.pig.data.Tuple>

Throws:

IOException