Package org.apache.druid.segment.shim

Class ShimObjectColumnValueSelector

java.lang.Object

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

org.apache.druid.segment.shim.ShimObjectColumnValueSelector

All Implemented Interfaces:

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

public class ShimObjectColumnValueSelector
extends ObjectColumnSelector<Object>

Shim from VectorObjectSelector to ColumnValueSelector for a ShimCursor.

Field Summary

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
ShimObjectColumnValueSelector(ShimCursor cursor, VectorObjectSelector vectorSelector)

Method Summary

Modifier and Type	Method	Description
Class<?>	classOfObject()	Most-specific class of object returned by BaseObjectColumnValueSelector.getObject(), if known in advance.
Object	getObject()	Returns the currently-selected object.
void	inspectRuntimeShape(RuntimeShapeInspector inspector)	Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1.

Methods inherited from class org.apache.druid.segment.ObjectColumnSelector

getDouble, getFloat, getLong, isNull

Methods inherited from class java.lang.Object

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

Constructor Details

ShimObjectColumnValueSelector

public ShimObjectColumnValueSelector(ShimCursor cursor,
 VectorObjectSelector vectorSelector)

Method Details

getObject

@Nullable
public Object getObject()

Description copied from interface: BaseObjectColumnValueSelector

Returns the currently-selected object. The behavior of this method depends on the type of selector, which can be determined by calling ColumnSelectorFactory.getColumnCapabilities(String) on the same ColumnSelectorFactory that you got this selector from. If the capabilties are nonnull, the selector type is given by TypeSignature.getType(). String selectors, where type is ColumnType.STRING, may return any type of object from this method, especially in cases where the selector is casting objects to string at selection time. Callers are encouraged to avoid the need to deal with various objects by using ColumnSelectorFactory.makeDimensionSelector(org.apache.druid.query.dimension.DimensionSpec) instead. Numeric selectors, where TypeSignature.isNumeric(), may return any type of Number. Callers that wish to deal with more specific types should treat the original ColumnValueSelector as a BaseLongColumnValueSelector, BaseDoubleColumnValueSelector, or BaseFloatColumnValueSelector instead. Array selectors, where TypeSignature.isArray(), must return Object[]. The array may contain null elements, and the array itself may also be null. Selectors of unknown type, where ColumnSelectorFactory.getColumnCapabilities(String) returns null, may return any type of object. Callers must be prepared for a wide variety of possible input objects. This case is common during ingestion, where selectors are built on top of external data.

classOfObject

public Class<?> classOfObject()

Description copied from interface: BaseObjectColumnValueSelector

Most-specific class of object returned by BaseObjectColumnValueSelector.getObject(), if known in advance. This method returns Object when selectors do not know in advance what class of object they may return.

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.