Solr - 如何按特定字段上的值的頻率進行排序？

Question

我在Eclipse上使用Java和SolrJ。如何將SolrQuery的結果按特定字段上的值的發生次序排序？例如，當我搜索特定作者的前n篇文章（docType = 0）時，我想按照字段（String類型）中的值的頻率對查詢結果進行排序。

如果某個作者X寫道：

• 2篇文章（A0，A1）在名爲J0
• 3篇文章（A2，A3，A4）在名爲J1雜誌
• 雜誌1條（A5）在名爲J2

訂購該雜誌必須是A2，A3，A4，A0，A1，A5和我要顯示在下面的方式結果

<doc> 
<arr name="author"> 
    <str>X</str> 
</arr> 
<str name="title">a2</str> 
<str name="journal">J1</str> 
</doc> 
<doc> 
<arr name="author"> 
    <str>X</str> 
</arr> 
<str name="title">a3</str> 
<str name="journal">J1</str> 
</doc> 
<doc> 
<arr name="author"> 
    <str>X</str> 
</arr> 
<str name="title">a4</str> 
<str name="journal">J1</str> 
</doc> 
<doc> 
<arr name="author"> 
    <str>X</str> 
</arr> 
<str name="title">a0</str> 
<str name="journal">J0</str> 
</doc> 
<doc> 
<arr name="author"> 
    <str>X</str> 
</arr> 
<str name="title">a1</str> 
<str name="journal">J0</str> 
</doc> 
<doc> 
<arr name="author"> 
    <str>X</str> 
</arr> 
<str name="title">a5</str> 
<str name="journal">J2</str> 
</doc> 

我的查詢是

SolrServer solrServer = new HttpSolrServer(urlString); 
SolrQuery query = new SolrQuery(); 
query.set("q", "docType:0); 
query.set("fq", "author:X"); 
query.set("fl", "author, title, journal"); 
query.setRows(n); 
... 
QueryResponse response = solrServer.query(query); 
SolrDocumentList results = response.getResults(); 

，在我的Solr schema.xml中有以下字段和類型

<types> 
    ... 
    <fieldType name="text_title" class="solr.TextField" 
     positionIncrementGap="100"> 
     <analyzer type="index"> 
      <tokenizer class="solr.WhitespaceTokenizerFactory" /> 
      <charFilter class="solr.HTMLStripCharFilterFactory" /> 
      <filter class="solr.ASCIIFoldingFilterFactory" /> 
      <filter class="solr.WordDelimiterFilterFactory" 
       generateWordParts="1" generateNumberParts="1" catenateWords="1" 
       catenateNumbers="1" catenateAll="1" splitOnCaseChange="1" 
       stemEnglishPossessive="1" preserveOriginal="1" /> 
      <filter class="solr.LowerCaseFilterFactory" /> 
      <filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15" side="front"/> 
      <filter class="solr.KStemFilterFactory" /> 
      <filter class="solr.RemoveDuplicatesTokenFilterFactory" /> 
     </analyzer> 
     <analyzer type="query"> 
      <tokenizer class="solr.WhitespaceTokenizerFactory" /> 
      <filter class="solr.ASCIIFoldingFilterFactory" /> 
      <filter class="solr.WordDelimiterFilterFactory" 
       generateWordParts="1" generateNumberParts="1" catenateWords="0" 
       catenateNumbers="0" catenateAll="0" splitOnCaseChange="1" 
       stemEnglishPossessive="1" preserveOriginal="1" /> 
      <filter class="solr.LowerCaseFilterFactory" /> 
      <filter class="solr.KStemFilterFactory" /> 
      <filter class="solr.RemoveDuplicatesTokenFilterFactory" /> 
     </analyzer> 
    </fieldType> 

    <fieldType name="text_name" class="solr.TextField" 
     positionIncrementGap="100"> 
     <analyzer type="index"> 
      <tokenizer class="solr.WhitespaceTokenizerFactory" /> 
      <charFilter class="solr.HTMLStripCharFilterFactory" /> 
      <filter class="solr.ASCIIFoldingFilterFactory" /> 
      <filter class="solr.WordDelimiterFilterFactory" 
       generateWordParts="1" generateNumberParts="1" catenateWords="1" 
       catenateNumbers="1" catenateAll="1" splitOnCaseChange="1" /> 
      <filter class="solr.LowerCaseFilterFactory" /> 
      <!-- n-grams utile per la ricerca per prefisso" --> 
      <filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15" side="front"/> 
      <!-- <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> --> 
     </analyzer> 
     <analyzer type="query"> 
      <tokenizer class="solr.WhitespaceTokenizerFactory" /> 
      <filter class="solr.ASCIIFoldingFilterFactory" /> 
      <filter class="solr.WordDelimiterFilterFactory" 
       generateWordParts="1" generateNumberParts="1" catenateWords="0" 
       catenateNumbers="0" catenateAll="0" splitOnCaseChange="1" /> 
      <filter class="solr.LowerCaseFilterFactory" /> 
      <!-- <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> --> 
     </analyzer> 
    </fieldType> 
</types> 
<fields> 
    <field name="docType" type="tint" indexed="true" stored="true" 
     multiValued="false" required="true" /> 
    <field name="key" type="string" indexed="true" stored="true" 
     multiValued="false" required="true" /> 
    <field name="mdate" type="date" indexed="true" stored="true" 
     multiValued="false" required="true" /> 
    ... 
    <field name="author" type="text_name" indexed="true" stored="true" 
     multiValued="true" /> 
    ... 
    <field name="journal" type="text_title" indexed="true" stored="true" 
     multiValued="false" /> 
    <field name="title" type="text_title" indexed="true" stored="true" 
     multiValued="false" /> 
    ... 
    <field name="journal_facet" type="string" indexed="true" stored="true" 
     multiValued="false" /> 
    ... 
    <copyField dest="journal_facet" source="journal" /> 
    ... 
</fields> 

非常感謝你的幫助。

Answer 1

有關編寫自定義功能的查詢，並通過它排序什麼：

http://localhost:8983/solr/select?q=*:*&sort=dist(2, point1, point2) desc 

參考

• Solr: Sort_by Function

Answer 2

如果小面的結果，只需用facet.sort獲得通過頻率排序方面：

https://wiki.apache.org/solr/SimpleFacetParameters#facet.sort