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

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

public class FloatMax
extends EvalFunc<Float>

math.max implements a binding to the Java function Math.max(int,int) for computing the the max value of the arguments. The returned value will be an int which is the maximum of the inputs.

Parameters:
value - 2 int values.
Return Value:
int max value of two input
Return Schema:
max_inputSchema
Example:
register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.max(float1);

Author:
ajay garg
See Also:
Math#max(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
FloatMax()
           
 
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

FloatMax

public FloatMax()
Method Detail

exec

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

Specified by:
exec in class EvalFunc<Float>
Parameters:
input - expects a two numeric value
output - returns a single numeric value, which is the smaller of two inputs
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


Copyright © 2007-2012 The Apache Software Foundation