Package org.apache.druid.segment.virtual

Class SingleStringInputCachingExpressionColumnValueSelector

java.lang.Object

org.apache.druid.segment.virtual.BaseExpressionColumnValueSelector

org.apache.druid.segment.virtual.SingleStringInputCachingExpressionColumnValueSelector

All Implemented Interfaces:

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

public class SingleStringInputCachingExpressionColumnValueSelector
extends BaseExpressionColumnValueSelector

Like ExpressionColumnValueSelector, but caches results for the first CACHE_SIZE dictionary IDs of a string column. Must only be used on selectors with dictionaries.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SingleStringInputCachingExpressionColumnValueSelector.LruEvalCache

Field Summary

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
SingleStringInputCachingExpressionColumnValueSelector(DimensionSelector selector, Expr expression, 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.
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 org.apache.druid.segment.virtual.BaseExpressionColumnValueSelector

classOfObject, getDouble, getFloat, getLong, getObject

Methods inherited from class java.lang.Object

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

Constructor Detail

SingleStringInputCachingExpressionColumnValueSelector

public SingleStringInputCachingExpressionColumnValueSelector(DimensionSelector selector,
                                                             Expr expression,
                                                             @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

protected ExprEval<?> eval()

Description copied from class: BaseExpressionColumnValueSelector

Implementations override this.

Specified by:

eval in class BaseExpressionColumnValueSelector

isNull

public 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

Overrides:

isNull in class BaseExpressionColumnValueSelector