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

Interface Column

All Known Implementing Classes:

BinaryColumn, BooleanColumn, DoubleColumn, FloatColumn, IntColumn, LongColumn, RunLengthEncodedColumn, TimeColumn

public interface Column

Method Summary

Modifier and Type	Method and Description
default Binary	getBinary(int position) Gets a Binary at position.
default boolean	getBoolean(int position) Gets a boolean at position.
TSDataType	getDataType() Get the data type.
default double	getDouble(int position) Gets a double at position.
ColumnEncoding	getEncoding() Get the encoding for this column.
default float	getFloat(int position) Gets a float at position.
default int	getInt(int position) Gets a little endian int at position.
default long	getLong(int position) Gets a little endian long at position.
default Object	getObject(int position) Gets an Object at position.
int	getPositionCount() Returns the number of positions in this block.
Column	getRegion(int positionOffset, int length) Returns a column starting at the specified position and extends for the specified length.
long	getRetainedSizeInBytes() Returns the retained size of this column in memory, including over-allocations.
default TsPrimitiveType	getTsPrimitiveType(int position) Gets a TsPrimitiveType at position.
boolean	isNull(int position) Is the specified position null?
boolean	mayHaveNull() Is it possible the column may have a null value? If false, the column cannot contain a null, but if true, the column may or may not have a null.
void	reverse() reverse the column
Column	subColumn(int fromIndex) This method will create a temporary view of origin column, which will reuse the array of column but with different array offset.

Method Detail

getDataType

TSDataType getDataType()

Get the data type.

getEncoding

ColumnEncoding getEncoding()

Get the encoding for this column.

getBoolean

default boolean getBoolean(int position)

Gets a boolean at position.

getInt

default int getInt(int position)

Gets a little endian int at position.

getLong

default long getLong(int position)

Gets a little endian long at position.

getFloat

default float getFloat(int position)

Gets a float at position.

getDouble

default double getDouble(int position)

Gets a double at position.

getBinary

default Binary getBinary(int position)

Gets a Binary at position.

getObject

default Object getObject(int position)

Gets an Object at position.

getTsPrimitiveType

default TsPrimitiveType getTsPrimitiveType(int position)

Gets a TsPrimitiveType at position.

mayHaveNull

boolean mayHaveNull()

Is it possible the column may have a null value? If false, the column cannot contain a null, but if true, the column may or may not have a null.

isNull

boolean isNull(int position)

Is the specified position null?

Throws:

IllegalArgumentException - if this position is not valid. The method may return false without throwing exception when there are no nulls in the block, even if the position is invalid

getPositionCount

int getPositionCount()

Returns the number of positions in this block.

getRetainedSizeInBytes

long getRetainedSizeInBytes()

Returns the retained size of this column in memory, including over-allocations. This method is called from the inner most execution loop and must be fast.

getRegion

Column getRegion(int positionOffset,
                 int length)

Returns a column starting at the specified position and extends for the specified length. The specified region must be entirely contained within this column.

The region can be a view over this column. If this column is released, the region column may also be released. If the region column is released, this block may also be released.

subColumn

Column subColumn(int fromIndex)

This method will create a temporary view of origin column, which will reuse the array of column but with different array offset.

reverse

void reverse()

reverse the column