ObjectColumnSelector (druid-processing 32.0.0 API)

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>
```
Restricts selector usage to only allow BaseObjectColumnValueSelector.getObject(). This class is convenient for implementation of "object-sourcing" ColumnValueSelectors. This class should appear ONLY in "extends" clause or anonymous class creation, but NOT in "user" code, where BaseObjectColumnValueSelector must be used instead.

Field Summary
- Fields inherited from interface org.apache.druid.segment.ColumnValueSelector
  EMPTY_ARRAY

Constructor Summary

Constructors
Constructor Description

ObjectColumnSelector()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getDouble()`
`float`	`getFloat()`
`long`	`getLong()`
`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

Methods inherited from interface org.apache.druid.segment.BaseObjectColumnValueSelector
classOfObject, getObject

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

- Constructor Detail
  - ObjectColumnSelector
```
public ObjectColumnSelector()
```
- Method Detail
  - getFloat
```
public final float getFloat()
```
    Specified by:
    
    getFloat in interface BaseFloatColumnValueSelector
  - getDouble
```
public final double getDouble()
```
    Specified by:
    
    getDouble in interface BaseDoubleColumnValueSelector
  - getLong
```
public final long getLong()
```
    Specified by:
    
    getLong in interface BaseLongColumnValueSelector
  - isNull
```
public final 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