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
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Search
Assembly: Lucene.Net.dll
Syntax
public class RandomAccessFilterStrategy : FilteredQuery.FilterStrategy

Methods

| Improve this Doc View Source

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
| Improve this Doc View Source

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.

Note

This API is for internal purposes only and might change in incompatible ways in the next release.

Declaration
protected virtual bool UseRandomAccess(IBits bits, int firstFilterDoc)
Parameters
Type Name Description
IBits bits
System.Int32 firstFilterDoc
Returns
Type Description
System.Boolean