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| Apache Lucene.NET 4.8.0-beta00010 Documentation </title>
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<article class="content wrap" id="_content" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery">
<h1 id="Lucene_Net_Join_ToParentBlockJoinQuery" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery" class="text-break">Class ToParentBlockJoinQuery
</h1>
<div class="markdown level0 summary"><p>This query requires that you index
children and parent docs as a single block, using the
<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. In each block, the
child documents must appear first, ending with the parent
document. At search time you provide a <span class="xref">Lucene.Net.Search.Filter</span>
identifying the parents, however this <span class="xref">Lucene.Net.Search.Filter</span> must provide
an <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.FixedBitSet.html">FixedBitSet</a> per sub-reader.</p>
<p>Once the block index is built, use this query to wrap
any sub-query matching only child docs and join matches in that
child document space up to the parent document space.
You can then use this <span class="xref">Lucene.Net.Search.Query</span> as a clause with
other queries in the parent document space.</p>
<p>See <a class="xref" href="Lucene.Net.Join.ToChildBlockJoinQuery.html">ToChildBlockJoinQuery</a> if you need to join
in the reverse order.</p>
<p>The child documents must be orthogonal to the parent
documents: the wrapped child query must never
return a parent document.</p>
<p>If you&apos;d like to retrieve <span class="xref">Lucene.Net.Search.Grouping.ITopGroups&lt;TGroupValue&gt;</span> for the
resulting query, use the <a class="xref" href="Lucene.Net.Join.ToParentBlockJoinCollector.html">ToParentBlockJoinCollector</a>.
Note that this is not necessary, ie, if you simply want
to collect the parent documents and don&apos;t need to see
which child documents matched under that parent, then
you can use any collector.</p>
<p><strong>NOTE</strong>: If the overall query contains parent-only
matches, for example you OR a parent-only query with a
joined child-only query, then the resulting collected documents
will be correct, however the <span class="xref">Lucene.Net.Search.Grouping.ITopGroups&lt;TGroupValue&gt;</span> you get
from <a class="xref" href="Lucene.Net.Join.ToParentBlockJoinCollector.html">ToParentBlockJoinCollector</a> will not contain every
child for parents that had matched.</p>
<p>See <a href="http://lucene.apache.org/core/4_8_0/join/">http://lucene.apache.org/core/4_8_0/join/</a> for an
overview. </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">Lucene.Net.Search.Query</span></div>
<div class="level2"><span class="xref">ToParentBlockJoinQuery</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">Lucene.Net.Search.Query.Boost</span>
</div>
<div>
<span class="xref">Lucene.Net.Search.Query.ToString()</span>
</div>
<div>
<span class="xref">Lucene.Net.Search.Query.Clone()</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</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>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Join.html">Lucene.Net.Join</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Join.dll</h6>
<h5 id="Lucene_Net_Join_ToParentBlockJoinQuery_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class ToParentBlockJoinQuery : Query</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Join_ToParentBlockJoinQuery__ctor_Lucene_Net_Search_Query_Lucene_Net_Search_Filter_Lucene_Net_Join_ScoreMode_.md&amp;value=---%0Auid%3A%20Lucene.Net.Join.ToParentBlockJoinQuery.%23ctor(Lucene.Net.Search.Query%2CLucene.Net.Search.Filter%2CLucene.Net.Join.ScoreMode)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Join_ToParentBlockJoinQuery__ctor_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.#ctor*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery__ctor_Lucene_Net_Search_Query_Lucene_Net_Search_Filter_Lucene_Net_Join_ScoreMode_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.#ctor(Lucene.Net.Search.Query,Lucene.Net.Search.Filter,Lucene.Net.Join.ScoreMode)">ToParentBlockJoinQuery(Query, Filter, ScoreMode)</h4>
<div class="markdown level1 summary"><p>Create a <a class="xref" href="Lucene.Net.Join.ToParentBlockJoinQuery.html">ToParentBlockJoinQuery</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public ToParentBlockJoinQuery(Query childQuery, Filter parentsFilter, ScoreMode scoreMode)</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.Query</span></td>
<td><span class="parametername">childQuery</span></td>
<td><p><span class="xref">Lucene.Net.Search.Query</span> matching child documents. </p>
</td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Filter</span></td>
<td><span class="parametername">parentsFilter</span></td>
<td><p><span class="xref">Lucene.Net.Search.Filter</span> (must produce <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.FixedBitSet.html">FixedBitSet</a>
per-segment, like <a class="xref" href="Lucene.Net.Join.FixedBitSetCachingWrapperFilter.html">FixedBitSetCachingWrapperFilter</a>)
identifying the parent documents. </p>
</td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Join.ScoreMode.html">ScoreMode</a></td>
<td><span class="parametername">scoreMode</span></td>
<td><p>How to aggregate multiple child scores
into a single parent score.</p>
</td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Join_ToParentBlockJoinQuery_CreateWeight_Lucene_Net_Search_IndexSearcher_.md&amp;value=---%0Auid%3A%20Lucene.Net.Join.ToParentBlockJoinQuery.CreateWeight(Lucene.Net.Search.IndexSearcher)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Join_ToParentBlockJoinQuery_CreateWeight_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.CreateWeight*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery_CreateWeight_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.CreateWeight(Lucene.Net.Search.IndexSearcher)">CreateWeight(IndexSearcher)</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 override Weight CreateWeight(IndexSearcher searcher)</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.IndexSearcher</span></td>
<td><span class="parametername">searcher</span></td>
<td></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><span class="xref">Lucene.Net.Search.Weight</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Search.Query.CreateWeight(Lucene.Net.Search.IndexSearcher)</span></div>
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</span>
<a id="Lucene_Net_Join_ToParentBlockJoinQuery_Equals_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.Equals*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery_Equals_System_Object_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.Equals(System.Object)">Equals(Object)</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 override bool Equals(object obj)</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.Object</span></td>
<td><span class="parametername">obj</span></td>
<td></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><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_Equals_System_Object_">Query.Equals(Object)</a></div>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Join_ToParentBlockJoinQuery_ExtractTerms_System_Collections_Generic_ISet_Lucene_Net_Index_Term__.md&amp;value=---%0Auid%3A%20Lucene.Net.Join.ToParentBlockJoinQuery.ExtractTerms(System.Collections.Generic.ISet%7BLucene.Net.Index.Term%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Join_ToParentBlockJoinQuery_ExtractTerms_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.ExtractTerms*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery_ExtractTerms_System_Collections_Generic_ISet_Lucene_Net_Index_Term__" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.ExtractTerms(System.Collections.Generic.ISet{Lucene.Net.Index.Term})">ExtractTerms(ISet&lt;Term&gt;)</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 override void ExtractTerms(ISet&lt;Term&gt; terms)</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.Collections.Generic.ISet</span>&lt;<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.Term.html">Term</a>&gt;</td>
<td><span class="parametername">terms</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_ExtractTerms_System_Collections_Generic_ISet_Lucene_Net_Index_Term__">Query.ExtractTerms(ISet&lt;Term&gt;)</a></div>
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</span>
<a id="Lucene_Net_Join_ToParentBlockJoinQuery_GetHashCode_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.GetHashCode*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery_GetHashCode" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.GetHashCode">GetHashCode()</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 override int GetHashCode()</code></pre>
</div>
<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><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Search.Query.GetHashCode()</span></div>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Join_ToParentBlockJoinQuery_Rewrite_Lucene_Net_Index_IndexReader_.md&amp;value=---%0Auid%3A%20Lucene.Net.Join.ToParentBlockJoinQuery.Rewrite(Lucene.Net.Index.IndexReader)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Join_ToParentBlockJoinQuery_Rewrite_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.Rewrite*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery_Rewrite_Lucene_Net_Index_IndexReader_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.Rewrite(Lucene.Net.Index.IndexReader)">Rewrite(IndexReader)</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 override Query Rewrite(IndexReader reader)</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.Index.IndexReader</span></td>
<td><span class="parametername">reader</span></td>
<td></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><span class="xref">Lucene.Net.Search.Query</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Search.Query.Rewrite(Lucene.Net.Index.IndexReader)</span></div>
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<a id="Lucene_Net_Join_ToParentBlockJoinQuery_ToString_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.ToString*"></a>
<h4 id="Lucene_Net_Join_ToParentBlockJoinQuery_ToString_System_String_" data-uid="Lucene.Net.Join.ToParentBlockJoinQuery.ToString(System.String)">ToString(String)</h4>
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<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override string ToString(string field)</code></pre>
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<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.String</span></td>
<td><span class="parametername">field</span></td>
<td></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><span class="xref">System.String</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_ToString_System_String_">Query.ToString(String)</a></div>
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