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

java.lang.Object
  org.apache.pig.EvalFunc<Double>
      org.apache.pig.piggybank.evaluation.math.DoubleMin

public class DoubleMin
extends EvalFunc<Double>

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

Parameters:

value - 2 int values.

Return Value:

int min value of two input

Return Schema:

min_inputSchema

Example:

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

Author:

ajay garg

See Also:

Math#min(double),

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

DoubleMin()

Method Summary

Double	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

DoubleMin

public DoubleMin()

Method Detail

exec

public Double exec(Tuple input)
            throws IOException

java level API

Specified by:

exec in class EvalFunc<Double>

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<Double>

Parameters:

input - Schema of the input

Returns:

Schema of the output