Package org.apache.sysds.runtime.compress.colgroup

Class ColGroupDeltaDDC

java.lang.Object

org.apache.sysds.runtime.compress.colgroup.AColGroup

org.apache.sysds.runtime.compress.colgroup.AColGroupCompressed

org.apache.sysds.runtime.compress.colgroup.AColGroupValue

org.apache.sysds.runtime.compress.colgroup.APreAgg

org.apache.sysds.runtime.compress.colgroup.ColGroupDDC

org.apache.sysds.runtime.compress.colgroup.ColGroupDeltaDDC

All Implemented Interfaces:

Serializable, Cloneable

public class ColGroupDeltaDDC
extends ColGroupDDC

Class to encapsulate information about a column group that is first delta encoded then encoded with dense dictionary encoding (DeltaDDC).

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup

AColGroup.CompressionType

Method Summary

Modifier and Type	Method	Description
static AColGroup	create(int[] colIndices, int numRows, ADictionary dict, AMapToData data, int[] cachedCounts)
AColGroup.CompressionType	getCompType()	Obtain the compression type.
AColGroup	scalarOperation(ScalarOperator op)	Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.ColGroupDDC

binaryRowOpLeft, binaryRowOpRight, estimateInMemorySize, getColGroupType, getCost, getCounts, getExactSizeOnDisk, getIdx, leftMultByMatrixNoPreAgg, preAggregateDense, preAggregateSparse, preAggregateThatDDCStructure, preAggregateThatSDCSingleZerosStructure, preAggregateThatSDCZerosStructure, readFields, sameIndexStructure, toString, unaryOperation, write

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.APreAgg

getPreAggregateSize, leftMultByAColGroup, mmWithDictionary, preAggregate, preAggregateThatIndexStructure, tsmmAColGroup

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupValue

centralMoment, computeColSums, containsValue, copy, decompressToDenseBlock, decompressToSparseBlock, forceMatrixBlockDictionary, getCachedCounts, getCounts, getDictionary, getNumberNonZeros, getNumValues, replace, rexpandCols, rightMultByMatrix

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupCompressed

getMax, getMin, preAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup

colSum, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getNumCols, shiftColIndices, sliceColumn, sliceColumns

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

create

public static AColGroup create(int[] colIndices,
                               int numRows,
                               ADictionary dict,
                               AMapToData data,
                               int[] cachedCounts)

getCompType

public AColGroup.CompressionType getCompType()

Description copied from class: AColGroup

Obtain the compression type.

Overrides:

getCompType in class ColGroupDDC

Returns:

How the elements of the column group are compressed.

scalarOperation

public AColGroup scalarOperation(ScalarOperator op)

Description copied from class: AColGroup

Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.

Overrides:

scalarOperation in class ColGroupDDC

Parameters:

op - operation to perform

Returns:

version of this column group with the operation applied