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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector">
<h1 id="Lucene_Net_Search_Grouping_BlockGroupingCollector" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector" class="text-break">Class BlockGroupingCollector
</h1>
<div class="markdown level0 summary"><p>BlockGroupingCollector performs grouping with a
single pass collector, as long as you are grouping by a
doc block field, ie all documents sharing a given group
value were indexed as a doc block using the atomic
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexWriter.html#Lucene_Net_Index_IndexWriter_AddDocuments_System_Collections_Generic_IEnumerable_System_Collections_Generic_IEnumerable_Lucene_Net_Index_IIndexableField___Lucene_Net_Analysis_Analyzer_">AddDocuments(IEnumerable&lt;IEnumerable&lt;IIndexableField&gt;&gt;, Analyzer)</a> or
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexWriter.html#Lucene_Net_Index_IndexWriter_UpdateDocuments_Lucene_Net_Index_Term_System_Collections_Generic_IEnumerable_System_Collections_Generic_IEnumerable_Lucene_Net_Index_IIndexableField___Lucene_Net_Analysis_Analyzer_">UpdateDocuments(Term, IEnumerable&lt;IEnumerable&lt;IIndexableField&gt;&gt;, Analyzer)</a>
API.</p>
<p><p>
This results in faster performance (~25% faster QPS)
than the two-pass grouping collectors, with the tradeoff
being that the documents in each group must always be
indexed as a block. This collector also fills in
TopGroups.totalGroupCount without requiring the separate
<a class="xref" href="Lucene.Net.Search.Grouping.Terms.TermAllGroupsCollector.html">TermAllGroupsCollector</a>. However, this collector does
not fill in the groupValue of each group; this field
will always be null.
</p>
<p>
<code>NOTE</code>: this collector makes no effort to verify
the docs were in fact indexed as a block, so it&apos;s up to
you to ensure this was the case.
</p>
<p>
See <a href="https://github.com/apache/lucene-solr/blob/releases/lucene-solr/4.8.0/lucene/grouping/src/java/org/apache/lucene/search/grouping/package.html">org.apache.lucene.search.grouping</a> for more
details including a full code example.
</p></p>
<div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><span class="xref">BlockGroupingCollector</span></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><span class="xref">Lucene.Net.Search.ICollector</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.Grouping.html">Lucene.Net.Search.Grouping</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Grouping.dll</h6>
<h5 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class BlockGroupingCollector : ICollector</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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</span>
<a id="Lucene_Net_Search_Grouping_BlockGroupingCollector__ctor_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.#ctor*"></a>
<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector__ctor_Lucene_Net_Search_Sort_System_Int32_System_Boolean_Lucene_Net_Search_Filter_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.#ctor(Lucene.Net.Search.Sort,System.Int32,System.Boolean,Lucene.Net.Search.Filter)">BlockGroupingCollector(Sort, Int32, Boolean, Filter)</h4>
<div class="markdown level1 summary"><p>Create the single pass collector.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public BlockGroupingCollector(Sort groupSort, int topNGroups, bool needsScores, Filter lastDocPerGroup)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Sort</span></td>
<td><span class="parametername">groupSort</span></td>
<td><p>The <span class="xref">Lucene.Net.Search.Sort</span> used to sort the
groups. The top sorted document within each group
according to groupSort, determines how that group
sorts against other groups. This must be non-null,
ie, if you want to groupSort by relevance use
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Search.Sort.html#Lucene_Net_Search_Sort_RELEVANCE">RELEVANCE</a>.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">topNGroups</span></td>
<td><p>How many top groups to keep.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">needsScores</span></td>
<td><p>true if the collected documents
require scores, either because relevance is included
in the withinGroupSort or because you plan to pass true
for either GetScores or GetMaxScores to <a class="xref" href="Lucene.Net.Search.Grouping.BlockGroupingCollector.html#Lucene_Net_Search_Grouping_BlockGroupingCollector_GetTopGroups_Lucene_Net_Search_Sort_System_Int32_System_Int32_System_Int32_System_Boolean_">GetTopGroups(Sort, Int32, Int32, Int32, Boolean)</a></p>
</td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Filter</span></td>
<td><span class="parametername">lastDocPerGroup</span></td>
<td><p>a <span class="xref">Lucene.Net.Search.Filter</span> that marks the
last document in each group.</p>
</td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
<span class="small pull-right mobile-hide">
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</span>
<a id="Lucene_Net_Search_Grouping_BlockGroupingCollector_AcceptsDocsOutOfOrder_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.AcceptsDocsOutOfOrder*"></a>
<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_AcceptsDocsOutOfOrder" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.AcceptsDocsOutOfOrder">AcceptsDocsOutOfOrder</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual bool AcceptsDocsOutOfOrder { get; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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</span>
<a id="Lucene_Net_Search_Grouping_BlockGroupingCollector_Collect_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.Collect*"></a>
<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_Collect_System_Int32_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.Collect(System.Int32)">Collect(Int32)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual void Collect(int doc)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">doc</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Search_Grouping_BlockGroupingCollector_GetTopGroups_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.GetTopGroups*"></a>
<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_GetTopGroups_Lucene_Net_Search_Sort_System_Int32_System_Int32_System_Int32_System_Boolean_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.GetTopGroups(Lucene.Net.Search.Sort,System.Int32,System.Int32,System.Int32,System.Boolean)">GetTopGroups(Sort, Int32, Int32, Int32, Boolean)</h4>
<div class="markdown level1 summary"><p>Returns the grouped results. Returns null if the
number of groups collected is &lt;= groupOffset.</p>
<p>
<strong>NOTE</strong>: This collector is unable to compute
the groupValue per group so it will always be null.
This is normally not a problem, as you can obtain the
value just like you obtain other values for each
matching document (eg, via stored fields, via
FieldCache, etc.)
</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual ITopGroups&lt;object&gt; GetTopGroups(Sort withinGroupSort, int groupOffset, int withinGroupOffset, int maxDocsPerGroup, bool fillSortFields)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Sort</span></td>
<td><span class="parametername">withinGroupSort</span></td>
<td><p>The <span class="xref">Lucene.Net.Search.Sort</span> used to sort
documents within each group. Passing null is
allowed, to sort by relevance.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">groupOffset</span></td>
<td><p>Which group to start from</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">withinGroupOffset</span></td>
<td><p>Which document to start from within each group</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">maxDocsPerGroup</span></td>
<td><p>How many top documents to keep within each group.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">fillSortFields</span></td>
<td><p>If true then the Comparable values for the sort fields will be set</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="Lucene.Net.Search.Grouping.ITopGroups-1.html">ITopGroups</a>&lt;<span class="xref">System.Object</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Search_Grouping_BlockGroupingCollector_GetTopGroups_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.GetTopGroups*"></a>
<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_GetTopGroups__1_Lucene_Net_Search_Sort_System_Int32_System_Int32_System_Int32_System_Boolean_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.GetTopGroups``1(Lucene.Net.Search.Sort,System.Int32,System.Int32,System.Int32,System.Boolean)">GetTopGroups&lt;TGroupValue&gt;(Sort, Int32, Int32, Int32, Boolean)</h4>
<div class="markdown level1 summary"><p>Returns the grouped results. Returns null if the
number of groups collected is &lt;= groupOffset.</p>
<p>
<strong>NOTE</strong>: This collector is unable to compute
the groupValue per group so it will always be null.
This is normally not a problem, as you can obtain the
value just like you obtain other values for each
matching document (eg, via stored fields, via
FieldCache, etc.)
</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual ITopGroups&lt;TGroupValue&gt; GetTopGroups&lt;TGroupValue&gt;(Sort withinGroupSort, int groupOffset, int withinGroupOffset, int maxDocsPerGroup, bool fillSortFields)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Sort</span></td>
<td><span class="parametername">withinGroupSort</span></td>
<td><p>The <span class="xref">Lucene.Net.Search.Sort</span> used to sort
documents within each group. Passing null is
allowed, to sort by relevance.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">groupOffset</span></td>
<td><p>Which group to start from</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">withinGroupOffset</span></td>
<td><p>Which document to start from within each group</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">maxDocsPerGroup</span></td>
<td><p>How many top documents to keep within each group.</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">fillSortFields</span></td>
<td><p>If true then the Comparable values for the sort fields will be set</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="Lucene.Net.Search.Grouping.ITopGroups-1.html">ITopGroups</a>&lt;TGroupValue&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">TGroupValue</span></td>
<td><p>The expected return type for group value</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_SetNextReader_Lucene_Net_Index_AtomicReaderContext_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.SetNextReader(Lucene.Net.Index.AtomicReaderContext)">SetNextReader(AtomicReaderContext)</h4>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">public virtual void SetNextReader(AtomicReaderContext context)</code></pre>
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<h5 class="parameters">Parameters</h5>
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<th>Description</th>
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<td><span class="xref">Lucene.Net.Index.AtomicReaderContext</span></td>
<td><span class="parametername">context</span></td>
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<h4 id="Lucene_Net_Search_Grouping_BlockGroupingCollector_SetScorer_Lucene_Net_Search_Scorer_" data-uid="Lucene.Net.Search.Grouping.BlockGroupingCollector.SetScorer(Lucene.Net.Search.Scorer)">SetScorer(Scorer)</h4>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">public virtual void SetScorer(Scorer scorer)</code></pre>
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<h5 class="parameters">Parameters</h5>
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<th>Type</th>
<th>Name</th>
<th>Description</th>
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<td><span class="xref">Lucene.Net.Search.Scorer</span></td>
<td><span class="parametername">scorer</span></td>
<td></td>
</tr>
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<h3 id="implements">Implements</h3>
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<span class="xref">Lucene.Net.Search.ICollector</span>
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