com.yahoo.bullet.querying.aggregations.sketches

Class KMVSketch

java.lang.Object

com.yahoo.bullet.querying.aggregations.sketches.Sketch

com.yahoo.bullet.querying.aggregations.sketches.DualSketch

com.yahoo.bullet.querying.aggregations.sketches.KMVSketch

Direct Known Subclasses:

ThetaSketch, TupleSketch

public abstract class KMVSketch
extends DualSketch

This class wraps some common metadata information for KMV Sketches - Theta and Tuple.

Field Summary

Fields

Modifier and Type	Field and Description
static String	META_STD_DEV_1
static String	META_STD_DEV_2
static String	META_STD_DEV_3
static String	META_STD_DEV_LB
static String	META_STD_DEV_UB

Fields inherited from class com.yahoo.bullet.querying.aggregations.sketches.Sketch

provider

Constructor Summary

Constructors

Constructor and Description
KMVSketch()

Method Summary

Modifier and Type	Method and Description
protected Map<String,Object>	addMetadata(Map<String,String> conceptKeys) Adds the common metadata for this Sketch to Map.
protected abstract Double	getLowerBound(int standardDeviation) Gets the lower bound at this standard deviation after the last createResult.
protected abstract Double	getTheta() Gets the theta value for this sketch after the last createResult.
protected abstract Double	getUpperBound(int standardDeviation) Gets the uppper bound at this standard deviation after the last createResult.

Methods inherited from class com.yahoo.bullet.querying.aggregations.sketches.DualSketch

merge, mergeBothSketches, mergeUnionSketch, mergeUpdateSketch, reset, union, unionedExistingResults, update

Methods inherited from class com.yahoo.bullet.querying.aggregations.sketches.Sketch

getFamily, getMetadata, getRecords, getResult, getSize, isEstimationMode, serialize, union

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

META_STD_DEV_1

public static final String META_STD_DEV_1

See Also:

Constant Field Values

META_STD_DEV_2

public static final String META_STD_DEV_2

See Also:

Constant Field Values

META_STD_DEV_3

public static final String META_STD_DEV_3

See Also:

Constant Field Values

META_STD_DEV_UB

public static final String META_STD_DEV_UB

See Also:

Constant Field Values

META_STD_DEV_LB

public static final String META_STD_DEV_LB

See Also:

Constant Field Values

Constructor Detail

KMVSketch

public KMVSketch()

Method Detail

getTheta

protected abstract Double getTheta()

Gets the theta value for this sketch after the last createResult. Only applicable after DualSketch.merge().

Returns:

A Double value that is the theta for this sketch.

getLowerBound

protected abstract Double getLowerBound(int standardDeviation)

Gets the lower bound at this standard deviation after the last createResult. Only applicable after DualSketch.merge().

Parameters:

standardDeviation - The standard deviation.

Returns:

A Double representing the maximum value at this standard deviation.

getUpperBound

protected abstract Double getUpperBound(int standardDeviation)

Gets the uppper bound at this standard deviation after the last createResult. Only applicable after DualSketch.merge().

Parameters:

standardDeviation - The standard deviation.

Returns:

A Double representing the minimum value at this standard deviation.

addMetadata

protected Map<String,Object> addMetadata(Map<String,String> conceptKeys)

Description copied from class: Sketch

Adds the common metadata for this Sketch to Map.

Overrides:

addMetadata in class Sketch

Parameters:

conceptKeys - The Map of Meta.Concept names to their keys.

Returns:

The created Map of sketch metadata.