Package org.apache.iotdb.tsfile.read.common.block.column

Class NullColumn

java.lang.Object

org.apache.iotdb.tsfile.read.common.block.column.NullColumn

All Implemented Interfaces:

Column

public class NullColumn
extends Object
implements Column

This column is used to represent columns that only contain null values. But its positionCount has to be consistent with corresponding valueColumn.

Constructor Summary

Constructors

Constructor	Description
NullColumn(int positionCount)

Method Summary

Modifier and Type	Method	Description
static Column	create(TSDataType dataType, int positionCount)
TSDataType	getDataType()
ColumnEncoding	getEncoding()
int	getInstanceSize()
int	getPositionCount()
Column	getRegion(int positionOffset, int length)
long	getRetainedSizeInBytes()
boolean[]	isNull()
boolean	isNull(int position)
boolean	mayHaveNull()
void	reverse()
Column	subColumn(int fromIndex)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.tsfile.read.common.block.column.Column

getBinaries, getBinary, getBoolean, getBooleans, getDouble, getDoubles, getFloat, getFloats, getInt, getInts, getLong, getLongs, getObject, getObjects, getTsPrimitiveType

Constructor Detail

NullColumn

public NullColumn(int positionCount)

Method Detail

getDataType

public TSDataType getDataType()

Specified by:

getDataType in interface Column

getEncoding

public ColumnEncoding getEncoding()

Specified by:

getEncoding in interface Column

mayHaveNull

public boolean mayHaveNull()

Specified by:

mayHaveNull in interface Column

isNull

public boolean isNull(int position)

Specified by:

isNull in interface Column

isNull

public boolean[] isNull()

Specified by:

isNull in interface Column

getPositionCount

public int getPositionCount()

Specified by:

getPositionCount in interface Column

getRetainedSizeInBytes

public long getRetainedSizeInBytes()

Specified by:

getRetainedSizeInBytes in interface Column

getRegion

public Column getRegion(int positionOffset,
                        int length)

Specified by:

getRegion in interface Column

subColumn

public Column subColumn(int fromIndex)

Specified by:

subColumn in interface Column

reverse

public void reverse()

Specified by:

reverse in interface Column

create

public static Column create(TSDataType dataType,
                            int positionCount)

getInstanceSize

public int getInstanceSize()

Specified by:

getInstanceSize in interface Column