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

java.lang.Object
  extended by org.apache.pig.EvalFunc<Integer>
      extended by org.apache.pig.piggybank.evaluation.math.getExponent

public class getExponent
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
getExponent()
           
 
Method Summary
 Integer exec(Tuple input)
          java level API
 List<FuncSpec> getArgToFuncMapping()
           
 Schema outputSchema(Schema input)
           
 
Methods inherited from class org.apache.pig.EvalFunc
finish, 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

getExponent

public getExponent()
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)
Overrides:
outputSchema in class EvalFunc<Integer>
Parameters:
input - Schema of the input
Returns:
Schema of the output

getArgToFuncMapping

public List<FuncSpec> getArgToFuncMapping()
                                   throws FrontendException
Overrides:
getArgToFuncMapping in class EvalFunc<Integer>
Returns:
A List containing FuncSpec objects representing the Function class which can handle the inputs corresponding to the schema in the objects
Throws:
FrontendException


Copyright © ${year} The Apache Software Foundation