Package org.apache.druid.segment.virtual

Class SingleLongInputCachingExpressionColumnValueSelector

java.lang.Object

org.apache.druid.segment.virtual.BaseExpressionColumnValueSelector

org.apache.druid.segment.virtual.SingleLongInputCachingExpressionColumnValueSelector

All Implemented Interfaces:

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

public class SingleLongInputCachingExpressionColumnValueSelector
extends BaseExpressionColumnValueSelector

Like ExpressionColumnValueSelector, but caches the most recently computed value and re-uses it in the case of runs in the underlying column. This is especially useful for the __time column, where we expect runs.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	SingleLongInputCachingExpressionColumnValueSelector.LruEvalCache

Field Summary

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
SingleLongInputCachingExpressionColumnValueSelector(ColumnValueSelector selector, Expr expression, boolean useLruCache, 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

SingleLongInputCachingExpressionColumnValueSelector

public SingleLongInputCachingExpressionColumnValueSelector(ColumnValueSelector selector,
                                                           Expr expression,
                                                           boolean useLruCache,
                                                           @Nullable
                                                           RowIdSupplier rowIdSupplier)

Method Detail

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

eval

@Nonnull
protected ExprEval<?> eval()

Description copied from class: BaseExpressionColumnValueSelector

Implementations override this.

Specified by:

eval in class BaseExpressionColumnValueSelector