org.apache.datasketches.pig.kll

Class GetQuantile

java.lang.Object

org.apache.pig.EvalFunc<Float>

org.apache.datasketches.pig.kll.GetQuantile

public class GetQuantile
extends org.apache.pig.EvalFunc<Float>

This UDF is to get a quantile value from a given sketch. A single value for a given fraction is returned. The fraction represents a normalized rank and must be from 0 to 1 inclusive. For example, the fraction of 0.5 corresponds to 50th percentile, which is the median value of the distribution (the number separating the higher half of the probability distribution from the lower half).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

org.apache.pig.EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
GetQuantile()

Method Summary

Modifier and Type	Method and Description
Float	exec(org.apache.pig.data.Tuple input)

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLoadCaster, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, outputSchema, progress, setEndOfAllInput, 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

GetQuantile

public GetQuantile()

Method Detail

exec

public Float exec(org.apache.pig.data.Tuple input)
           throws IOException

Specified by:

exec in class org.apache.pig.EvalFunc<Float>

Throws:

IOException