Package org.apache.druid.query.filter

Class AbstractOptimizableDimFilter

java.lang.Object

org.apache.druid.query.filter.AbstractOptimizableDimFilter

All Implemented Interfaces:

Cacheable, DimFilter

Direct Known Subclasses:

AndDimFilter, ArrayContainsElementFilter, BoundDimFilter, ColumnComparisonDimFilter, EqualityFilter, ExpressionDimFilter, ExtractionDimFilter, FalseDimFilter, InDimFilter, IntervalDimFilter, IsBooleanDimFilter, JavaScriptDimFilter, LikeDimFilter, NotDimFilter, NullFilter, OrDimFilter, RangeFilter, RegexDimFilter, SearchQueryDimFilter, SelectorDimFilter, SpatialDimFilter, TrueDimFilter, TypedInFilter

public abstract class AbstractOptimizableDimFilter
extends Object
implements DimFilter

Base class for most DimFilter. This abstract class provides a default implementation of toOptimizedFilter(boolean) that uses a memoized supplier relying on optimize(boolean) and DimFilter.toFilter(). This fulfils the expectation that toOptimizedFilter(boolean) returns the same instance when called multiple times.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.druid.query.filter.DimFilter

DimFilter.DimFilterToStringBuilder

Constructor Summary

Constructors

Constructor	Description
AbstractOptimizableDimFilter()

Method Summary

Modifier and Type	Method	Description
DimFilter	optimize(boolean mayIncludeUnknown)	Returns an optimized version of this filter.
final Filter	toOptimizedFilter(boolean mayIncludeUnknown)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.java.util.common.Cacheable

getCacheKey

Methods inherited from interface org.apache.druid.query.filter.DimFilter

getDimensionRangeSet, getRequiredColumns, toFilter

Constructor Details

AbstractOptimizableDimFilter

public AbstractOptimizableDimFilter()

Method Details

optimize

public DimFilter optimize(boolean mayIncludeUnknown)

Description copied from interface: DimFilter

Returns an optimized version of this filter.

Specified by:

optimize in interface DimFilter

Parameters:

mayIncludeUnknown - whether the optimized filter may need to operate in "includeUnknown" mode.

toOptimizedFilter

public final Filter toOptimizedFilter(boolean mayIncludeUnknown)

Specified by:

toOptimizedFilter in interface DimFilter

Parameters:

mayIncludeUnknown - whether the optimized filter may need to operate in "includeUnknown" mode.

Returns:

Return a Filter that implements this DimFilter, after applying optimizations to this DimFilter. A typical implementation will return the result of `optimize().toFilter()` See abstract base class AbstractOptimizableDimFilter for a common implementation shared by current DimFilters. The Filter returned by this method across multiple calls must be the same object: parts of the query stack compare Filters, and returning the same object allows these checks to avoid deep comparisons. (see HashJoinSegmentCursorFactory.makeCursorHolder(CursorBuildSpec) for an example}