搜索 – Solr 1.4和EdgeNGrams的奇怪结果 – 一些子串匹配,有些则不匹配

2019年8月3日 226次阅读

编辑3：我现在使用的解决方法是从我的查询和索引字段中删除除字母,数字和空格之外的任何内容.这产生了理想的行为,但这是一个解决方法,而不是一个真正的解决方案,我仍然想了解为什么Solr正在做它正在做的事情……所以仍然对答案感兴趣,如果有人有.结束编辑3

我有一个名为“TT-14B”的文件,索引是Solr 1.4(通过Django / Haystack).当我在content_auto字段中查询“tt-1”或“tt 14”或“tt 14b”时,我得到了文件;当我查询“tt-14”或“tt-14b”时,我没有得到任何结果.我编辑了Haystack生成的Solr架构,试图解决这个问题,但无济于事.使用analyze.jsp,在我看来,我应该得到“tt-14”的匹配;我当然应该为“tt-14b”获得一个. (编辑：哦,将默认运算符从AND更改为OR无效.)

有人能帮助我理解为什么这不起作用？谢谢.

…

结果

QUERY  | WORKS
=======|======
tt     | yes
tt-    | yes
tt-1   | yes
tt-14  | no
tt-14b | no
tt 14  | yes
tt 14b | yes

编辑2

得到了一些比较奇怪的结果,可能有助于调试问题.在这种情况下,测试文件是“abc’def”.

QUERY   | WORKS
========|======
abc     | yes
abc'd   | yes
abc'de  | no
abc'def | no

显然,相同的模式,但我不明白是什么导致它.

结束编辑2

schema.xml相关部分(下面的完整文件)

<fieldType name="edge_ngram" class="solr.TextField" positionIncrementGap="1">
  <analyzer type="index">
    <tokenizer class="solr.WhitespaceTokenizerFactory" />
    <filter class="solr.LowerCaseFilterFactory" />
    <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnNumerics="0" preserveOriginal="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="1"/>
    <filter class="solr.EdgeNGramFilterFactory" minGramSize="1" maxGramSize="15" side="front" />
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.WhitespaceTokenizerFactory" />
    <filter class="solr.LowerCaseFilterFactory" />
    <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnNumerics="0" preserveOriginal="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="1"/>
  </analyzer>
</fieldType>

schema.xml(完整)

<?xml version="1.0" ?>
<!--
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->

<schema name="default" version="1.1">
  <types>
    <fieldtype name="string"  class="solr.StrField" sortMissingLast="true" omitNorms="true"/>
    <fieldType name="boolean" class="solr.BoolField" sortMissingLast="true" omitNorms="true"/>

    <!-- Numeric field types that manipulate the value into
         a string value that isn't human-readable in its internal form,
         but with a lexicographic ordering the same as the numeric ordering,
         so that range queries work correctly. -->
    <fieldType name="sint" class="solr.SortableIntField" sortMissingLast="true" omitNorms="true"/>
    <fieldType name="slong" class="solr.SortableLongField" sortMissingLast="true" omitNorms="true"/>
    <fieldType name="sfloat" class="solr.SortableFloatField" sortMissingLast="true" omitNorms="true"/>
    <fieldType name="sdouble" class="solr.SortableDoubleField" sortMissingLast="true" omitNorms="true"/>

    <fieldType name="date" class="solr.DateField" sortMissingLast="true" omitNorms="true"/>

    <fieldType name="text" class="solr.TextField" positionIncrementGap="100">
      <analyzer type="index">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <!-- in this example, we will only use synonyms at query time
        <filter class="solr.SynonymFilterFactory" synonyms="index_synonyms.txt" ignoreCase="true" expand="false"/>
        -->
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt"/>
        <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnNumerics="0" preserveOriginal="1" catenateWords="1" catenateNumbers="1" catenateAll="1"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.EnglishPorterFilterFactory" protected="protwords.txt"/>
        <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/>
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt"/>
        <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnNumerics="0" preserveOriginal="1" catenateWords="0" catenateNumbers="0" catenateAll="1"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.EnglishPorterFilterFactory" protected="protwords.txt"/>
        <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
      </analyzer>
    </fieldType>

    <fieldType name="text_ws" class="solr.TextField" positionIncrementGap="100">
      <analyzer>
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
      </analyzer>
    </fieldType>

    <fieldType name="ngram" class="solr.TextField" >
      <analyzer type="index">
        <tokenizer class="solr.KeywordTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.NGramFilterFactory" minGramSize="2" maxGramSize="15" />
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.KeywordTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
      </analyzer>
    </fieldType>

    <fieldType name="edge_ngram" class="solr.TextField" positionIncrementGap="1">
      <analyzer type="index">
        <tokenizer class="solr.WhitespaceTokenizerFactory" />
        <filter class="solr.LowerCaseFilterFactory" />
        <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnNumerics="0" preserveOriginal="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="1"/>
        <filter class="solr.EdgeNGramFilterFactory" minGramSize="1" maxGramSize="15" side="front" />
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.WhitespaceTokenizerFactory" />
        <filter class="solr.LowerCaseFilterFactory" />
        <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnNumerics="0" preserveOriginal="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="1"/>
      </analyzer>
    </fieldType>
  </types>

  <fields>   
    <!-- general -->
    <field name="id" type="string" indexed="true" stored="true" multiValued="false" required="true"/>
    <field name="django_ct" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="django_id" type="string" indexed="true" stored="true" multiValued="false" />

    <dynamicField name="*_i"  type="sint"    indexed="true"  stored="true"/>
    <dynamicField name="*_s"  type="string"  indexed="true"  stored="true"/>
    <dynamicField name="*_l"  type="slong"   indexed="true"  stored="true"/>
    <dynamicField name="*_t"  type="text"    indexed="true"  stored="true"/>
    <dynamicField name="*_b"  type="boolean" indexed="true"  stored="true"/>
    <dynamicField name="*_f"  type="sfloat"  indexed="true"  stored="true"/>
    <dynamicField name="*_d"  type="sdouble" indexed="true"  stored="true"/>
    <dynamicField name="*_dt" type="date"    indexed="true"  stored="true"/>


    <field name="modelname_exact" type="string" indexed="true" stored="true" multiValued="false" />

    <field name="modelname" type="text" indexed="true" stored="true" multiValued="false" />

    <field name="name" type="text" indexed="true" stored="true" multiValued="false" />

    <field name="text" type="text" indexed="true" stored="true" multiValued="false" />

    <field name="name_exact" type="string" indexed="true" stored="true" multiValued="false" />

    <field name="content_auto" type="edge_ngram" indexed="true" stored="true" multiValued="true" />

  </fields>

  <!-- field to use to determine and enforce document uniqueness. -->
  <uniqueKey>id</uniqueKey>

  <!-- field for the QueryParser to use when an explicit fieldname is absent -->
  <defaultSearchField>text</defaultSearchField>

  <!-- SolrQueryParser configuration: defaultOperator="AND|OR" -->
  <solrQueryParser defaultOperator="AND" />
</schema>

最佳答案每个案例的/admin/analysis.jsp的屏幕截图都很有趣.

有没有理由,为什么positionIncrementGap =“1”设置为1？

由于whitspace标记器,tt-14b和tt 14b处理不同.
这意味着：tt-14b是一个术语,只要WordDelimiterFilterFactory没有被触发,而tt 14b从一开始就是2个术语.
positionIncrementGap使您可以将不同的术语视为一个短语,即使没有邻居,也可以在下一个“n”位置.所以尝试提升positionIncrementGap.

顺便说一句：我在schema.xml上注意到的第一个是查询时缺少的“EdgeNGramFilterFactory”.哪个应该没问题.但也有可以理解的原因,为什么“查询和索引时间相同的过滤器”作为最佳实践处理.
这取决于每种特殊情况,但在查询时激活此过滤器将是一次尝试.