Package org.apache.druid.segment

Class NilColumnValueSelector

java.lang.Object

org.apache.druid.segment.NilColumnValueSelector

All Implemented Interfaces:

HotLoopCallee, BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseLongColumnValueSelector, BaseNullableColumnValueSelector, BaseObjectColumnValueSelector, ColumnValueSelector

public class NilColumnValueSelector
extends Object
implements ColumnValueSelector

Represents "absent" column.

Field Summary

Fields inherited from interface org.apache.druid.segment.ColumnValueSelector

EMPTY_ARRAY

Method Summary

Modifier and Type	Method	Description
Class	classOfObject()	Returns Object.class.
double	getDouble()	always throws an exception, all values in this column are null
float	getFloat()	always throws an exception, all values in this column are null
long	getLong()	always throws an exception, all values in this column are null
Object	getObject()	Always returns null.
void	inspectRuntimeShape(RuntimeShapeInspector inspector)	Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1.
static NilColumnValueSelector	instance()
boolean	isNull()	Returns true if the primitive long, double, or float value returned by this selector should be treated as null.

Methods inherited from class java.lang.Object

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

Method Details

instance

public static NilColumnValueSelector instance()

getDouble

public double getDouble()

always throws an exception, all values in this column are null

Specified by:

getDouble in interface BaseDoubleColumnValueSelector

getFloat

public float getFloat()

always throws an exception, all values in this column are null

Specified by:

getFloat in interface BaseFloatColumnValueSelector

getLong

public long getLong()

always throws an exception, all values in this column are null

Specified by:

getLong in interface BaseLongColumnValueSelector

getObject

@Nullable
public Object getObject()

Always returns null.

Specified by:

getObject in interface BaseObjectColumnValueSelector

classOfObject

public Class classOfObject()

Returns Object.class.

Specified by:

classOfObject in interface BaseObjectColumnValueSelector

isNull

public boolean isNull()

Description copied from interface: BaseNullableColumnValueSelector

Returns true if the primitive long, double, or float value returned by this selector should be treated as null. Users of BaseLongColumnValueSelector.getLong(), BaseDoubleColumnValueSelector.getDouble() and BaseFloatColumnValueSelector.getFloat() must check this method first, or else they may improperly use placeholder values returned by the primitive get methods. Users of BaseObjectColumnValueSelector.getObject() should not call this method. Instead, call "getObject" and check if it is null.

Specified by:

isNull in interface BaseNullableColumnValueSelector

inspectRuntimeShape

public void inspectRuntimeShape(RuntimeShapeInspector inspector)

Description copied from interface: HotLoopCallee

Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1. They are used in methods of this class, annotated with CalledFromHotLoop 2. They are either: a. Nullable objects b. Instances of HotLoopCallee c. Objects, which don't always have a specific class in runtime. For example, a field of type Set could be HashSet or TreeSet in runtime, depending on how this instance (the instance on which inspectRuntimeShape() is called) is configured. d. ByteBuffer or similar objects, where byte order matters e. boolean flags, affecting branch taking f. Arrays of objects, meeting any of conditions a-e.

Specified by:

inspectRuntimeShape in interface HotLoopCallee