org.apache.pig.piggybank.evaluation.math
Class SCALB
java.lang.Object
org.apache.pig.EvalFunc<Double>
org.apache.pig.piggybank.evaluation.math.SCALB
public class SCALB
- extends EvalFunc<Double>
math.SCALB implements a binding to the Java function
Math.scalb(double,int)
.
Given a tuple with two data atom x and y ,it Return x pow(2,y)
rounded as if performed by a single correctly rounded
floating-point multiply to a member of the double value set.
- Parameters:
value
- Tuple containing two numeric values [Double, Integer]
.
- Return Value:
Double
- Return Schema:
- SCALB_inputSchema
- Example:
register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.SCALB(float1);
- Author:
- ajay garg
- See Also:
Math.scalb(double,int)
,
Constructor Summary |
SCALB()
|
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 |
SCALB
public SCALB()
exec
public Double exec(Tuple input)
throws IOException
- java level API
- Specified by:
exec
in class EvalFunc<Double>
- Parameters:
input
- expects a tuple containing two numeric DataAtom valueoutput
- returns a single numeric DataAtom value, which is
fistArgument pow(2,secondArgument) rounded as if performed by a
single correctly rounded floating-point multiply to a member of
the double value set.
- 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