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

java.lang.Object
  org.apache.pig.EvalFunc<Integer>
      org.apache.pig.piggybank.evaluation.math.DoubleGetExponent

public class DoubleGetExponent
extends EvalFunc<Integer>

math.getExponent implements a binding to the Java function Math.getExponent(double). Given a single data atom it returns the unbiased exponent used in the representation of a double

Parameters:

value - double.

Return Value:

int

Return Schema:

getExponent_inputSchema

Example:

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

Author:

ajay garg

See Also:

Math.getExponent(double),

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

DoubleGetExponent()

Method Summary

Integer	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

DoubleGetExponent

public DoubleGetExponent()

Method Detail

exec

public Integer exec(Tuple input)
             throws IOException

java level API

Specified by:

exec in class EvalFunc<Integer>

Parameters:

input - expects a single numeric value

output - returns a single numeric value, unbiased exponent used in the representation of a double

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<Integer>

Parameters:

input - Schema of the input

Returns:

Schema of the output