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| <h1 id="faceted-search">faceted search</h1> |
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| <p> This module provides multiple methods for computing facet counts and value aggregations: * Taxonomy-based methods rely on a separate taxonomy index to map hierarchical facet paths to global int ordinals for fast counting at search time; these methods can compute counts ((<a class="xref" href="Lucene.Net.Facet.Taxonomy.FastTaxonomyFacetCounts.html">FastTaxonomyFacetCounts</a>, <a class="xref" href="Lucene.Net.Facet.Taxonomy.TaxonomyFacetCounts.html">TaxonomyFacetCounts</a>) aggregate long or double values <xref:Lucene.Net.Facet.Taxonomy.TaxonomyFacetSumIntAssociations>, <xref:Lucene.Net.Facet.Taxonomy.TaxonomyFacetSumFloatAssociations>, <a class="xref" href="Lucene.Net.Facet.Taxonomy.TaxonomyFacetSumValueSource.html">TaxonomyFacetSumValueSource</a>. Add <a class="xref" href="Lucene.Net.Facet.FacetField.html">FacetField</a> or <a class="xref" href="Lucene.Net.Facet.Taxonomy.AssociationFacetField.html">AssociationFacetField</a> to your documents at index time to use taxonomy-based methods. * Sorted-set doc values method does not require a separate taxonomy index, and computes counts based on sorted set doc values fields (<xref:Lucene.Net.Facet.Sortedset.SortedSetDocValuesFacetCounts>). Add <xref:Lucene.Net.Facet.Sortedset.SortedSetDocValuesFacetField> to your documents at index time to use sorted set facet counts. * Range faceting <xref:Lucene.Net.Facet.Range.LongRangeFacetCounts>, <a class="xref" href="Lucene.Net.Facet.Range.DoubleRangeFacetCounts.html">DoubleRangeFacetCounts</a> compute counts for a dynamic numeric range from a provided <xref:Lucene.Net.Queries.Function.ValueSource> (previously indexed numeric field, or a dynamic expression such as distance). </p> |
| <p> At search time you first run your search, but pass a <a class="xref" href="Lucene.Net.Facet.FacetsCollector.html">FacetsCollector</a> to gather all hits (and optionally, scores for each hit). Then, instantiate whichever facet methods you'd like to use to compute aggregates. Finally, all methods implement a common <a class="xref" href="Lucene.Net.Facet.Facets.html">Facets</a> base API that you use to obtain specific facet counts. </p> |
| <p> The various <a class="xref" href="Lucene.Net.Facet.FacetsCollector.html">#search</a> utility methods are useful for doing an "ordinary" search (sorting by score, or by a specified Sort) but also collecting into a <a class="xref" href="Lucene.Net.Facet.FacetsCollector.html">FacetsCollector</a> for subsequent faceting. </p> |
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