org.apache.pig.piggybank.evaluation.math
Class SIGNUM
java.lang.Object
org.apache.pig.EvalFunc<Double>
org.apache.pig.piggybank.evaluation.math.SIGNUM
public class SIGNUM
- extends EvalFunc<Double>
math.SIGNUM implements a binding to the Java function
Math.signum(double)
.
Given a single data atom it Returns the signum function of the argument.
- Parameters:
value
- Double
.
- Return Value:
Double
- Return Schema:
- SIGNUM_inputSchema
- Example:
register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.SIGNUM(float1);
- Author:
- ajay garg
- See Also:
Math.signum(double)
,
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 |
SIGNUM
public SIGNUM()
exec
public Double exec(Tuple input)
throws IOException
- java level API
- Specified by:
exec
in class EvalFunc<Double>
- Parameters:
input
- expects a single numeric DataAtom valueoutput
- returns a single numeric DataAtom value,
signum function of the argument
- Returns:
- result, of type T.
- Throws:
IOException
outputSchema
public Schema outputSchema(Schema input)
- Overrides:
outputSchema
in class EvalFunc<Double>
- Parameters:
input
- Schema of the input
- Returns:
- Schema of the output
getArgToFuncMapping
public List<FuncSpec> getArgToFuncMapping()
throws FrontendException
- Overrides:
getArgToFuncMapping
in class EvalFunc<Double>
- 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