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

Class AColGroupOffset

java.lang.Object

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

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

org.apache.sysds.runtime.compress.colgroup.ADictBasedColGroup

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

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

org.apache.sysds.runtime.compress.colgroup.AColGroupOffset

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ColGroupOLE, ColGroupRLE

public abstract class AColGroupOffset
extends APreAgg

Base class for column groups encoded with various types of bitmap encoding. NOTES: * OLE: separate storage segment length and bitmaps led to a 30% improvement but not applied because more difficult to support both data layouts at the same time (distributed/local as well as w/ and w/o low-level opt)

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
boolean	containZerosTuples()
long	estimateInMemorySize()	Get the upper bound estimate of in memory allocation for the column group.
long	getExactSizeOnDisk()	Returns the exact serialized size of column group.
static char[]	readData(DataInput in)
static int[]	readPointers(DataInput in)
void	write(DataOutput out)

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

getPreAggregateSize, leftMultByAColGroup, mmWithDictionary, preAggregate, preAggregateDense, preAggregateSparse, preAggregateThatIndexStructure, tsmmAColGroup

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

centralMoment, computeColSums, getCounts, getNumberNonZeros, getNumValues, replace, rexpandCols, toString

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

decompressToDenseBlock, decompressToSparseBlock, getDictionary, rightMultByMatrix

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

getMax, getMin, getSum, isEmpty, preAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations

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

append, appendN, binaryRowOpLeft, binaryRowOpRight, colSum, containsValue, decompressToDenseBlock, decompressToSparseBlock, get, getColIndices, getCompressionScheme, getCompType, getCost, getIdx, getNumCols, leftMultByMatrixNoPreAgg, rightMultByMatrix, scalarOperation, shiftColIndices, sliceColumn, sliceColumns, sliceRows, unaryOperation

Methods inherited from class java.lang.Object

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

Method Detail

estimateInMemorySize

public long estimateInMemorySize()

Description copied from class: AColGroup

Get the upper bound estimate of in memory allocation for the column group.

Overrides:

estimateInMemorySize in class AColGroupValue

Returns:

an upper bound on the number of bytes used to store this ColGroup in memory.

readPointers

public static int[] readPointers(DataInput in)
                          throws IOException

Throws:

IOException

readData

public static char[] readData(DataInput in)
                       throws IOException

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Overrides:

write in class ADictBasedColGroup

Throws:

IOException

getExactSizeOnDisk

public long getExactSizeOnDisk()

Description copied from class: AColGroup

Returns the exact serialized size of column group. This can be used for example for buffer preallocation.

Overrides:

getExactSizeOnDisk in class ADictBasedColGroup

Returns:

exact serialized size for column group

containZerosTuples

public boolean containZerosTuples()