org.apache.lucene.facet

Class DrillSideways

java.lang.Object

org.apache.lucene.facet.DrillSideways

public class DrillSideways
extends Object

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 DrillSideways.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.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DrillSideways.ConcurrentDrillSidewaysResult<R> Result of a concurrent drill sideways search, including the Facets and TopDocs.
static class	DrillSideways.DrillSidewaysResult Result of a drill sideways search, including the Facets and TopDocs.

Field Summary

Fields

Modifier and Type	Field and Description
protected FacetsConfig	config FacetsConfig passed to constructor.
protected IndexSearcher	searcher IndexSearcher passed to constructor.
protected SortedSetDocValuesReaderState	state SortedSetDocValuesReaderState passed to constructor; can be null.
protected TaxonomyReader	taxoReader TaxonomyReader passed to constructor.

Constructor Summary

Constructors

Constructor and Description
DrillSideways(IndexSearcher searcher, FacetsConfig config, SortedSetDocValuesReaderState state) Create a new DrillSideways instance, assuming the categories were indexed with SortedSetDocValuesFacetField.
DrillSideways(IndexSearcher searcher, FacetsConfig config, TaxonomyReader taxoReader) Create a new DrillSideways instance.
DrillSideways(IndexSearcher searcher, FacetsConfig config, TaxonomyReader taxoReader, SortedSetDocValuesReaderState state) Create a new DrillSideways instance, where some dimensions were indexed with SortedSetDocValuesFacetField and others were indexed with FacetField.
DrillSideways(IndexSearcher searcher, FacetsConfig config, TaxonomyReader taxoReader, SortedSetDocValuesReaderState state, ExecutorService executor) Create a new DrillSideways instance, where some dimensions were indexed with SortedSetDocValuesFacetField and others were indexed with FacetField.

Method Summary

Modifier and Type	Method and Description
protected Facets	buildFacetsResult(FacetsCollector drillDowns, FacetsCollector[] drillSideways, String[] drillSidewaysDims) Subclass can override to customize per-dim Facets impl.
protected boolean	scoreSubDocsAtOnce() Override this and return true if your collector (e.g., ToParentBlockJoinCollector) expects all sub-scorers to be positioned on the document being collected.
DrillSideways.DrillSidewaysResult	search(DrillDownQuery query, Collector hitCollector) Search, collecting hits with a Collector, and computing drill down and sideways counts.
<R> DrillSideways.ConcurrentDrillSidewaysResult<R>	search(DrillDownQuery query, CollectorManager<?,R> hitCollectorManager) Runs a search, using a CollectorManager to gather and merge search results
DrillSideways.DrillSidewaysResult	search(DrillDownQuery query, int topN) Search, sorting by score, and computing drill down and sideways counts.
DrillSideways.DrillSidewaysResult	search(DrillDownQuery query, Query filter, FieldDoc after, int topN, Sort sort, boolean doDocScores) Search, sorting by Sort, and computing drill down and sideways counts.
DrillSideways.DrillSidewaysResult	search(ScoreDoc after, DrillDownQuery query, int topN) Search, sorting by score, and computing drill down and sideways counts.

Methods inherited from class java.lang.Object

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

Field Detail

searcher

protected final IndexSearcher searcher

IndexSearcher passed to constructor.

taxoReader

protected final TaxonomyReader taxoReader

TaxonomyReader passed to constructor.

state

protected final SortedSetDocValuesReaderState state

SortedSetDocValuesReaderState passed to constructor; can be null.

config

protected final FacetsConfig config

FacetsConfig passed to constructor.

Constructor Detail

DrillSideways

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

Create a new DrillSideways instance.

DrillSideways

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

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

DrillSideways

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

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

DrillSideways

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

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

Use this constructor to use the concurrent implementation and/or the CollectorManager

Method Detail

buildFacetsResult

protected Facets buildFacetsResult(FacetsCollector drillDowns,
                                   FacetsCollector[] drillSideways,
                                   String[] drillSidewaysDims)
                            throws IOException

Subclass can override to customize per-dim Facets impl.

Throws:

IOException

search

public DrillSideways.DrillSidewaysResult search(DrillDownQuery query,
                                                Collector hitCollector)
                                         throws IOException

Search, collecting hits with a Collector, and computing drill down and sideways counts.

Throws:

IOException

search

public DrillSideways.DrillSidewaysResult search(DrillDownQuery query,
                                                Query filter,
                                                FieldDoc after,
                                                int topN,
                                                Sort sort,
                                                boolean doDocScores)
                                         throws IOException

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

Throws:

IOException

search

public DrillSideways.DrillSidewaysResult search(DrillDownQuery query,
                                                int topN)
                                         throws IOException

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

Throws:

IOException

search

public DrillSideways.DrillSidewaysResult search(ScoreDoc after,
                                                DrillDownQuery query,
                                                int topN)
                                         throws IOException

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

Throws:

IOException

scoreSubDocsAtOnce

protected boolean scoreSubDocsAtOnce()

Override this and return true if your collector (e.g., ToParentBlockJoinCollector) expects all sub-scorers to be positioned on the document being collected. This will cause some performance loss; default is false.

search

public <R> DrillSideways.ConcurrentDrillSidewaysResult<R> search(DrillDownQuery query,
                                                                 CollectorManager<?,R> hitCollectorManager)
                                                          throws IOException

Runs a search, using a CollectorManager to gather and merge search results

Throws:

IOException