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

java.lang.Object
  extended by org.apache.pig.EvalFunc<Long>
      extended by org.apache.pig.piggybank.evaluation.math.LongMax

public class LongMax
extends EvalFunc<Long>

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

Parameters:
value - 2 long values.
Return Value:
long 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),

Field Summary
 
Fields inherited from class org.apache.pig.EvalFunc
log, pigLogger, reporter, returnType
 
Constructor Summary
LongMax()
           
 
Method Summary
 Long 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

LongMax

public LongMax()
Method Detail

exec

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

Specified by:
exec in class EvalFunc<Long>
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.

Overrides:
outputSchema in class EvalFunc<Long>
Parameters:
input - Schema of the input
Returns:
Schema of the output


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