Package org.apache.druid.segment.virtual

Class ExpressionColumnValueSelector

java.lang.Object

org.apache.druid.segment.virtual.BaseExpressionColumnValueSelector

org.apache.druid.segment.virtual.ExpressionColumnValueSelector

All Implemented Interfaces:

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

public class ExpressionColumnValueSelector
extends BaseExpressionColumnValueSelector

Basic expression ColumnValueSelector. Evaluates Expr into ExprEval against Expr.ObjectBinding which are backed by the underlying expression input ColumnValueSelectors

Field Summary

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
ExpressionColumnValueSelector(Expr expression, Expr.ObjectBinding bindings, RowIdSupplier rowIdSupplier)

Method Summary

Modifier and Type	Method	Description
protected ExprEval<?>	eval()	Implementations override this.
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.virtual.BaseExpressionColumnValueSelector

classOfObject, getDouble, getFloat, getLong, getObject, isNull

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionColumnValueSelector

public ExpressionColumnValueSelector(Expr expression,
                                     Expr.ObjectBinding bindings,
                                     @Nullable
                                     RowIdSupplier rowIdSupplier)

Method Detail

eval

protected ExprEval<?> eval()

Description copied from class: BaseExpressionColumnValueSelector

Implementations override this.

Specified by:

eval in class BaseExpressionColumnValueSelector

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

Overrides:

inspectRuntimeShape in class BaseExpressionColumnValueSelector