Package org.apache.druid.segment.virtual

Class FeaturelessSelectableColumn

java.lang.Object

org.apache.druid.segment.virtual.FeaturelessSelectableColumn

All Implemented Interfaces:

SelectableColumn

public class FeaturelessSelectableColumn
extends Object
implements SelectableColumn

Selectable column that does not support anything. Its as(Class) method always returns null.

Field Summary

Fields

Modifier and Type	Field	Description
static final FeaturelessSelectableColumn	INSTANCE

Method Summary

Modifier and Type	Method	Description
<T> T	as(Class<T> clazz)	Request an implementation of a particular interface.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final FeaturelessSelectableColumn INSTANCE

Method Details

as

@Nullable
public <T> T as(Class<T> clazz)

Description copied from interface: SelectableColumn

Request an implementation of a particular interface. Physical nested columns, and virtual columns that act as a nested column, should implement:

• NestedColumnTypeInspector, required.
• NestedColumnSelectorFactory, required.
• NestedVectorColumnSelectorFactory, required.
• NestedColumnIndexSupplier, if the column has indexes.

Specified by:

as in interface SelectableColumn

Type Parameters:

T - desired interface

Parameters:

clazz - desired interface

Returns:

instance of clazz, or null if the interface is not supported by this segment