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

java.lang.Object
  extended by org.apache.pig.EvalFunc<Float>
      extended by org.apache.pig.piggybank.evaluation.math.FloatCopySign

public class FloatCopySign
extends EvalFunc<Float>

math.copySign implements a binding to the Java function Math.copySign(float,float). Given a tuple with two data atom Returns the first floating-point argument with the sign of the second floating-point argument.

Parameters:
value - Tuple containing two float.
Return Value:
float
Return Schema:
copySign_inputSchema
Example:
register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.copySign(float1);

Author:
ajay garg
See Also:
Math.copySign(float,float),

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
FloatCopySign()
           
 
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, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, isAsynchronous, progress, 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

FloatCopySign

public FloatCopySign()
Method Detail

exec

public Float exec(Tuple input)
           throws IOException
java level API

Specified by:
exec in class EvalFunc<Float>
Parameters:
input - expects a tuple containing two numeric DataAtom value
output - returns a single numeric DataAtom value, which is first floating-point argument with the sign of the second floating-point 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<Float>
Parameters:
input - Schema of the input
Returns:
Schema of the output


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