org.apache.pig.piggybank.evaluation.stats

Class COV

java.lang.Object

org.apache.pig.EvalFunc<DataBag>

org.apache.pig.piggybank.evaluation.stats.COV

All Implemented Interfaces:

Serializable, Algebraic

Deprecated.

Use COV

@Deprecated
public class COV
extends EvalFunc<DataBag>
implements Algebraic, Serializable

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	COV.Final Deprecated.
static class	COV.Initial Deprecated.
static class	COV.Intermed Deprecated.

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

EvalFunc.SchemaType

Field Summary

Fields

Modifier and Type	Field and Description
protected Vector<String>	schemaName Deprecated.

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
COV() Deprecated.
COV(String... schemaName) Deprecated.

Method Summary

Modifier and Type	Method and Description
protected static Tuple	combine(DataBag values) Deprecated. combine results of different data chunk
protected static Tuple	computeAll(DataBag first, DataBag second) Deprecated. compute sum(XY), sum(X), sum(Y) from given data sets
DataBag	exec(Tuple input) Deprecated. Function to compute covariance between data sets.
String	getFinal() Deprecated. Get the final function.
String	getInitial() Deprecated. Get the initial function.
String	getIntermed() Deprecated. Get the intermediate function.
Schema	outputSchema(Schema input) Deprecated. Report the schema of the output of this UDF.
String	toString() Deprecated. Function to return argument of constructor as string.

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, wait, wait, wait

Field Detail

schemaName

protected Vector<String> schemaName

Deprecated.

Constructor Detail

COV

public COV()

Deprecated.

COV

public COV(String... schemaName)

Deprecated.

Method Detail

exec

public DataBag exec(Tuple input)
             throws IOException

Deprecated.

Function to compute covariance between data sets.

Specified by:

exec in class EvalFunc<DataBag>

Parameters:

input - input tuple which contains data sets.

output - output dataBag which contain covariance between each pair of data sets.

Returns:

result, of type T.

Throws:

IOException

toString

public String toString()

Deprecated.

Function to return argument of constructor as string. It append ( and ) at starting and end or argument respectively. If default constructor is called is returns empty string.

Overrides:

toString in class Object

Returns:

argument of constructor

getInitial

public String getInitial()

Deprecated.

Description copied from interface: Algebraic

Get the initial function.

Specified by:

getInitial in interface Algebraic

Returns:

A function name of f_init. f_init should be an eval func. The return type of f_init.exec() has to be Tuple

getIntermed

public String getIntermed()

Deprecated.

Description copied from interface: Algebraic

Get the intermediate function.

Specified by:

getIntermed in interface Algebraic

Returns:

A function name of f_intermed. f_intermed should be an eval func. The return type of f_intermed.exec() has to be Tuple

getFinal

public String getFinal()

Deprecated.

Description copied from interface: Algebraic

Get the final function.

Specified by:

getFinal in interface Algebraic

Returns:

A function name of f_final. f_final should be an eval func parametrized by the same datum as the eval func implementing this interface.

combine

protected static Tuple combine(DataBag values)
                        throws IOException

Deprecated.

combine results of different data chunk

Parameters:

values - DataBag containing partial results computed on different data chunks

output - Tuple containing combined data

Throws:

IOException

computeAll

protected static Tuple computeAll(DataBag first,
                                  DataBag second)
                           throws IOException

Deprecated.

compute sum(XY), sum(X), sum(Y) from given data sets

Parameters:

first - DataBag containing first data set

second - DataBag containing second data set

Returns:

tuple containing sum(XY), sum(X), sum(Y)

Throws:

IOException

outputSchema

public Schema outputSchema(Schema input)

Deprecated.

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.

The default implementation interprets the OutputSchema annotation, if one is present. Otherwise, it returns null (no known output schema).

Overrides:

outputSchema in class EvalFunc<DataBag>

Parameters:

input - Schema of the input

Returns:

Schema of the output