org.apache.druid.segment

Class ObjectColumnSelector<T>

java.lang.Object

org.apache.druid.segment.ObjectColumnSelector<T>

All Implemented Interfaces:

HotLoopCallee, BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseLongColumnValueSelector, BaseNullableColumnValueSelector, BaseObjectColumnValueSelector<T>, ColumnValueSelector<T>

Direct Known Subclasses:

ObjectAggregateCombiner, SettableObjectColumnValueSelector

public abstract class ObjectColumnSelector<T>
extends Object
implements ColumnValueSelector<T>

This class is convenient for implementation of "object-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseObjectColumnValueSelector.getObject() and BaseObjectColumnValueSelector.classOfObject(). This class should appear ONLY in "extends" clause or anonymous class creation, but NOT in "user" code, where BaseObjectColumnValueSelector must be used instead. This is a class rather than an interface unlike LongColumnSelector, FloatColumnSelector and DoubleColumnSelector solely in order to make isNull() method final.

Field Summary

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor and Description
ObjectColumnSelector()

Method Summary

Modifier and Type	Method and Description
double	getDouble() Deprecated. This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on ColumnValueSelector objects.
float	getFloat() Deprecated. This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on ColumnValueSelector objects.
long	getLong() Deprecated. This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on ColumnValueSelector objects.
boolean	isNull() Deprecated. This method is marked as deprecated in ObjectColumnSelector since it always returns false. There is no need to call this method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.monomorphicprocessing.HotLoopCallee

inspectRuntimeShape

Methods inherited from interface org.apache.druid.segment.BaseObjectColumnValueSelector

classOfObject, getObject

Constructor Detail

ObjectColumnSelector

public ObjectColumnSelector()

Method Detail

getFloat

@Deprecated
public float getFloat()

Deprecated. This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on ColumnValueSelector objects.

Specified by:

getFloat in interface BaseFloatColumnValueSelector

getDouble

@Deprecated
public double getDouble()

Deprecated. This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on ColumnValueSelector objects.

Specified by:

getDouble in interface BaseDoubleColumnValueSelector

getLong

@Deprecated
public long getLong()

Deprecated. This method is marked as deprecated in ObjectColumnSelector to minimize the probability of accidental calling. "Polymorphism" of ObjectColumnSelector should be used only when operating on ColumnValueSelector objects.

Specified by:

getLong in interface BaseLongColumnValueSelector

isNull

@Deprecated
public final boolean isNull()

Deprecated. This method is marked as deprecated in ObjectColumnSelector since it always returns false. There is no need to call this method.

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