org.apache.sysml.runtime.compress

Class PlanningCoCodingGroup

java.lang.Object

org.apache.sysml.runtime.compress.PlanningCoCodingGroup

public class PlanningCoCodingGroup
extends Object

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

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 bitmapSizeEstimator, float numRowsWeight) Constructor for merging two disjoint groups of columns

Method Summary

Modifier and Type	Method and Description
float	getCardinalityRatio()
int[]	getColIndices()
long	getEstSize() Obtain estimated compressed size of the grouped columns.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, 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 bitmapSizeEstimator,
                             float numRowsWeight)

Constructor for merging two disjoint groups of columns

Parameters:

grp1 - first group of columns to merge

grp2 - second group to merge

bitmapSizeEstimator - bitmap size estimator

numRowsWeight - numRows x sparsity

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

getCardinalityRatio

public float getCardinalityRatio()

toString

public String toString()

Overrides:

toString in class Object