org.apache.sysml.runtime.compress.cocode

Class PlanningCoCodingGroup

java.lang.Object

org.apache.sysml.runtime.compress.cocode.PlanningCoCodingGroup

public class PlanningCoCodingGroup
extends Object

Class to represent information about co-coding a group of columns.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PlanningCoCodingGroup.ColIndexes

Constructor Summary

Constructors

Constructor and Description
PlanningCoCodingGroup(int col, PlanningCoCoder.GroupableColInfo info) Constructor for a one-column group; i.e.
PlanningCoCodingGroup(PlanningCoCodingGroup grp1, PlanningCoCodingGroup grp2, CompressedSizeEstimator estim, int numRows) Constructor for merging two disjoint groups of columns

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object that)
double	getCardinalityRatio()
double	getChangeInSize()
int[]	getColIndices()
long	getEstSize() Obtain estimated compressed size of the grouped columns.
PlanningCoCodingGroup	getLeftGroup()
static int[]	getMergedIndexes(int[] indexes1, int[] indexes2)
PlanningCoCodingGroup	getRightGroup()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PlanningCoCodingGroup

public PlanningCoCodingGroup(int col,
                             PlanningCoCoder.GroupableColInfo info)

Constructor for a one-column group; i.e. do not co-code a given column.

Parameters:

col - column

info - groupable column info

PlanningCoCodingGroup

public PlanningCoCodingGroup(PlanningCoCodingGroup grp1,
                             PlanningCoCodingGroup grp2,
                             CompressedSizeEstimator estim,
                             int numRows)

Constructor for merging two disjoint groups of columns

Parameters:

grp1 - first column group to merge

grp2 - second column group to merge

estim - bitmap size estimator

numRows - number of rows

Method Detail

getColIndices

public int[] getColIndices()

getEstSize

public long getEstSize()

Obtain estimated compressed size of the grouped columns.

Returns:

estimated compressed size of the grouped columns

getChangeInSize

public double getChangeInSize()

getCardinalityRatio

public double getCardinalityRatio()

getLeftGroup

public PlanningCoCodingGroup getLeftGroup()

getRightGroup

public PlanningCoCodingGroup getRightGroup()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object that)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

getMergedIndexes

public static int[] getMergedIndexes(int[] indexes1,
                                     int[] indexes2)