org.apache.pig.piggybank.evaluation.math
Class FloatUlp

java.lang.Object
  org.apache.pig.EvalFunc<Float>
      org.apache.pig.piggybank.evaluation.math.FloatUlp

public class FloatUlp
extends EvalFunc<Float>

math.ULP implements a binding to the Java function Math.ulp(float). Given a single data atom it Returns the size of an ulp of the argument.

Parameters:

value - Float.

Return Value:

Float

Return Schema:

ULP_inputSchema

Example:

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

Author:

ajay garg

See Also:

Math.ulp(float),

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

FloatUlp()

Method Summary

Float	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

finish, getArgToFuncMapping, getCacheFiles, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, isAsynchronous, progress, setPigLogger, setReporter, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

FloatUlp

public FloatUlp()

Method Detail

exec

public Float exec(Tuple input)
           throws IOException

java level API

Specified by:

exec in class EvalFunc<Float>

Parameters:

input - expects a single numeric value

output - returns a single numeric value, the size of an ulp of the 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.

Overrides:

outputSchema in class EvalFunc<Float>

Parameters:

input - Schema of the input

Returns:

Schema of the output