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Editorial Team
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Asked: 2026-05-14T07:27:09+00:00

I need to run a JOIN query on a solr index. I’ve got two

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I need to run a JOIN query on a solr index. I’ve got two xmls that I have indexed, person.xml and subject.xml.

Person:

<doc>
<field name="id">P39126</field>
<field name="family">Smith</field>
<field name="given">John</field>
<field name="subject">S1276</field>
<field name="subject">S1312</field>
</doc>

Subject:

<doc>
<field name="id">S1276</field>
<field name="topic">Abnormalities, Human</field>
</doc>

I need to only display information from the person doc but each query should match fields in both person and subject. In the case the query matches only the subject doc I need to display all docs from the person that have a matching id. Is this possible to do without running two seperate queries? Something like a JOIN query would do the job.

Any help?

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1 Answer

  1. Editorial Team

    I do not think it is possible to do what you are asking with a single query using your schema.

    One thing that you should keep in mind is to always think of Solr indexes as single denormalized tables. This is sometimes a challenge and there may be times where you must be forced to use different indexes for each kind of data.

    For your problem, maybe having a schema like this one might help:

    <doc>
 <field name="id">P39126</field>
 <field name="family">Smith</field>
 <field name="given">John</field>
 <field name="topic">Abnormalities, Human</field> <!-- subject S1276 -->
 <field name="topic">some, other, topics</field> <!-- subject S1312 -->
</doc>

    Running a query for some topics with this schema would return all person having those topics.

    Some links that might interest you:

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