org.apache.pig.piggybank.evaluation.math

Class DoubleNextAfter

java.lang.Object

org.apache.pig.EvalFunc<Double>

org.apache.pig.piggybank.evaluation.math.DoubleNextAfter

public class DoubleNextAfter
extends EvalFunc<Double>

math.nextAfter implements a binding to the Java function Math.nextAfter(double,double). Given a tuple with two data atom it Returns the floating-point number adjacent to the first argument in the direction of the second argument.

Parameters:

value - Tuple containing two double.

Return Value:

double

Return Schema:

nextAfter_inputSchema

Example:

register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.nextAfter(float1);

Author:

ajay garg

See Also:

Math.nextAfter(double,double),

Nested Class Summary

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

EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
DoubleNextAfter()

Method Summary

Methods

Modifier and Type	Method and Description
Double	exec(Tuple input) java level API
Schema	outputSchema(Schema input) Report the schema of the output of this UDF.

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, 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

DoubleNextAfter

public DoubleNextAfter()

Method Detail

exec

public Double exec(Tuple input)
            throws IOException

java level API

Specified by:

exec in class EvalFunc<Double>

Parameters:

input - expects a tuple containing two numeric DataAtom value

output - returns a single numeric DataAtom value, which is the floating-point number adjacent to the first argument in the direction of the second argument.

Returns:

result, of type T.

Throws:

IOException

outputSchema

public Schema outputSchema(Schema input)

Description copied from class: EvalFunc

Report the schema of the output of this UDF. Pig will make use of this in error checking, optimization, and planning. The schema of input data to this UDF is provided.

The default implementation interprets the OutputSchema annotation, if one is present. Otherwise, it returns null (no known output schema).

Overrides:

outputSchema in class EvalFunc<Double>

Parameters:

input - Schema of the input

Returns:

Schema of the output