Solr 中过滤器查询的 docValues 与索引字段类型

Question

I need to add a field to Solr that would only be used for filtering.

ie /query?q=*&fq=department:HR

Which of these two definitions would work better and why?

<field name="department" type="string" indexed="true" docValues="false" />

<field name="department" type="string" indexed="false" docValues="true" />

Answer 1

The below implementation is good for querying:

<field name="department" type="string" indexed="true" docValues="false" />

Reason:

docValues="true" is required when you want to do faceting and sorting . It will be the ideal and optimized case in that situation. Since you only want querying docValues="false" is good.

indexed="true" is good and it will query your results faster as it will store the field in the indexed form which is faster than normal field . So you'll be able to retrieve the results faster.