Class DrillSideways

Computes drill down and sideways counts for the provided DrillDownQuery. Drill sideways counts include alternative values/aggregates for the drill-down dimensions so that a dimension does not disappear after the user drills down into it.

Use one of the static search methods to do the search, and then get the hits and facet results from the returned DrillSidewaysResult.

NOTE: this allocates one FacetsCollector for each drill-down, plus one. If your index has high number of facet labels then this will multiply your memory usage. @lucene.experimental

Inheritance

System.Object

DrillSideways

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.Facet

Assembly: Lucene.Net.Facet.dll

Syntax

public class DrillSideways

Constructors

DrillSideways(IndexSearcher, FacetsConfig, SortedSetDocValuesReaderState)

Create a new DrillSideways instance, assuming the categories were indexed with SortedSetDocValuesFacetField.

Declaration

public DrillSideways(IndexSearcher searcher, FacetsConfig config, SortedSetDocValuesReaderState state)

Parameters

Type	Name	Description
Lucene.Net.Search.IndexSearcher	searcher
FacetsConfig	config
SortedSetDocValuesReaderState	state

DrillSideways(IndexSearcher, FacetsConfig, TaxonomyReader)

Create a new DrillSideways instance.

Declaration

public DrillSideways(IndexSearcher searcher, FacetsConfig config, TaxonomyReader taxoReader)

Parameters

Type	Name	Description
Lucene.Net.Search.IndexSearcher	searcher
FacetsConfig	config
TaxonomyReader	taxoReader

DrillSideways(IndexSearcher, FacetsConfig, TaxonomyReader, SortedSetDocValuesReaderState)

Create a new DrillSideways instance, where some dimensions were indexed with SortedSetDocValuesFacetField and others were indexed with FacetField.

Declaration

public DrillSideways(IndexSearcher searcher, FacetsConfig config, TaxonomyReader taxoReader, SortedSetDocValuesReaderState state)

Parameters

Type	Name	Description
Lucene.Net.Search.IndexSearcher	searcher
FacetsConfig	config
TaxonomyReader	taxoReader
SortedSetDocValuesReaderState	state

Fields

m_config

FacetsConfig passed to constructor.

Declaration

protected readonly FacetsConfig m_config

Field Value

Type	Description
FacetsConfig

m_searcher

Lucene.Net.Search.IndexSearcher passed to constructor.

Declaration

protected readonly IndexSearcher m_searcher

Field Value

Type	Description
Lucene.Net.Search.IndexSearcher

m_state

SortedSetDocValuesReaderState passed to constructor; can be null.

Declaration

protected readonly SortedSetDocValuesReaderState m_state

Field Value

Type	Description
SortedSetDocValuesReaderState

m_taxoReader

TaxonomyReader passed to constructor.

Declaration

protected readonly TaxonomyReader m_taxoReader

Field Value

Type	Description
TaxonomyReader

Properties

ScoreSubDocsAtOnce

Override this and return true if your collector (e.g., Lucene.Net.Join.ToParentBlockJoinCollector) expects all sub-scorers to be positioned on the document being collected. This will cause some performance loss; default is false. Note that if you return true from this method (in a subclass) be sure your collector also returns false from Lucene.Net.Search.ICollector.AcceptsDocsOutOfOrder: this will trick BooleanQuery into also scoring all subDocs at once.

Declaration

protected virtual bool ScoreSubDocsAtOnce { get; }

Property Value

Type	Description
System.Boolean

Methods

BuildFacetsResult(FacetsCollector, FacetsCollector[], String[])

Subclass can override to customize per-dim Facets impl.

Declaration

protected virtual Facets BuildFacetsResult(FacetsCollector drillDowns, FacetsCollector[] drillSideways, string[] drillSidewaysDims)

Parameters

Type	Name	Description
FacetsCollector	drillDowns
FacetsCollector[]	drillSideways
System.String[]	drillSidewaysDims

Returns

Type	Description
Facets

Search(DrillDownQuery, Filter, FieldDoc, Int32, Sort, Boolean, Boolean)

Search, sorting by Lucene.Net.Search.Sort, and computing drill down and sideways counts.

Declaration

public virtual DrillSidewaysResult Search(DrillDownQuery query, Filter filter, FieldDoc after, int topN, Sort sort, bool doDocScores, bool doMaxScore)

Parameters

Type	Name	Description
DrillDownQuery	query
Lucene.Net.Search.Filter	filter
Lucene.Net.Search.FieldDoc	after
System.Int32	topN
Lucene.Net.Search.Sort	sort
System.Boolean	doDocScores
System.Boolean	doMaxScore

Returns

Type	Description
DrillSidewaysResult

Search(DrillDownQuery, ICollector)

Search, collecting hits with a Lucene.Net.Search.ICollector, and computing drill down and sideways counts.

Declaration

public virtual DrillSidewaysResult Search(DrillDownQuery query, ICollector hitCollector)

Parameters

Type	Name	Description
DrillDownQuery	query
Lucene.Net.Search.ICollector	hitCollector

Returns

Type	Description
DrillSidewaysResult

Search(DrillDownQuery, Int32)

Search, sorting by score, and computing drill down and sideways counts.

Declaration

public virtual DrillSidewaysResult Search(DrillDownQuery query, int topN)

Parameters

Type	Name	Description
DrillDownQuery	query
System.Int32	topN

Returns

Type	Description
DrillSidewaysResult

Search(ScoreDoc, DrillDownQuery, Int32)

Search, sorting by score, and computing drill down and sideways counts.

Declaration

public virtual DrillSidewaysResult Search(ScoreDoc after, DrillDownQuery query, int topN)

Parameters

Type	Name	Description
Lucene.Net.Search.ScoreDoc	after
DrillDownQuery	query
System.Int32	topN

Returns

Type	Description
DrillSidewaysResult