org.apache.datasketches.pig.sampling

Class GetVarOptSamples

java.lang.Object

org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>

org.apache.datasketches.pig.sampling.GetVarOptSamples

public class GetVarOptSamples
extends org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>

This UDF extracts samples from the binary image of a VarOpt<Tuple> sketch. Because the input is a binary object, this UDF is unable to automatically determine the data schema at query planning time, beyond knowing that the result will be a DataBag of (varOptWeight, (record)) tuples.

Author:

Jon Malkin

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
GetVarOptSamples()

Method Summary

Modifier and Type	Method and Description
org.apache.pig.data.DataBag	exec(org.apache.pig.data.Tuple inputTuple)
org.apache.pig.impl.logicalLayer.schema.Schema	outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema input)

Methods inherited from class org.apache.pig.EvalFunc

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

GetVarOptSamples

public GetVarOptSamples()

Method Detail

exec

public org.apache.pig.data.DataBag exec(org.apache.pig.data.Tuple inputTuple)
                                 throws IOException

Specified by:

exec in class org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>

Throws:

IOException

outputSchema

public org.apache.pig.impl.logicalLayer.schema.Schema outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema input)

Overrides:

outputSchema in class org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>