Class FilteredQuery.RandomAccessFilterStrategy

A FilteredQuery.FilterStrategy that conditionally uses a random access filter if the given DocIdSet supports random access (returns a non-null value from Bits) and UseRandomAccess(IBits, Int32) returns

true

. Otherwise this strategy falls back to a "zig-zag join" (

LEAP_FROG_FILTER_FIRST_STRATEGY) strategy .

Inheritance

System.Object

FilteredQuery.FilterStrategy

FilteredQuery.RandomAccessFilterStrategy

Inherited Members

FilteredQuery.FilterStrategy.FilteredBulkScorer(AtomicReaderContext, Weight, Boolean, DocIdSet)

Namespace: Lucene.Net.Search

Assembly: Lucene.Net.dll

Syntax

public class RandomAccessFilterStrategy : FilteredQuery.FilterStrategy

Methods

FilteredScorer(AtomicReaderContext, Weight, DocIdSet)

Declaration

public override Scorer FilteredScorer(AtomicReaderContext context, Weight weight, DocIdSet docIdSet)

Parameters

Type	Name	Description
AtomicReaderContext	context
Weight	weight
DocIdSet	docIdSet

Returns

Type	Description
Scorer

Overrides

FilteredQuery.FilterStrategy.FilteredScorer(AtomicReaderContext, Weight, DocIdSet)

UseRandomAccess(IBits, Int32)

Expert: decides if a filter should be executed as "random-access" or not. Random-access means the filter "filters" in a similar way as deleted docs are filtered in Lucene. This is faster when the filter accepts many documents. However, when the filter is very sparse, it can be faster to execute the query+filter as a conjunction in some cases.

The default implementation returns true if the first document accepted by the filter is < 100.

This is a Lucene.NET INTERNAL API, use at your own risk

Declaration

protected virtual bool UseRandomAccess(IBits bits, int firstFilterDoc)

Parameters

Type	Name	Description
IBits	bits
System.Int32	firstFilterDoc

Returns

Type	Description
System.Boolean