在solr中添加自定义字段类型

Question

In solr schema.xml many field types are defined. for example

<fieldType name="int" class="solr.TrieIntField" precisionStep="0" positionIncrementGap="0"/>

is a definition for an integer field.

How we define custom field types inside solr?

Is it possible to add java types such as BigInteger, BigDecimal, Map and other types as field type in solr?

Answer 1

You can define new custom fields in solr by adding them to the schema.xml in the <fields> element:

<fields>
...
<field name="newfieldname" type="text_general" indexed="true" stored="true" multiValued="true"/>
...
</fields>

To have an overview on the supported types (used to define the <fieldType> in Solr, which then are used to define the field elements), take a look to this link: https://cwiki.apache.org/confluence/display/solr/Field+Types+Included+with+Solr . For example, the type "text_general" is defined in schema.xml as:

<fieldType name="text_general" class="solr.TextField" positionIncrementGap="100">
  <analyzer type="index">
    <tokenizer class="solr.StandardTokenizerFactory"/>
    <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" />
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.StandardTokenizerFactory"/>
    <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" />
    <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/>
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
</fieldType>

You can see it uses the class="solr.TextField" as its basic field type. The Solr schema already has several types defined by default... but you can define more, not sure if you can defined the ones you are asking for.

Answer 2

You can define new fieldType by extending the FieldType class where you can define your own analyzer for the field and also add other attributes. For example the TextField is a subclass of the FieldType.