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javasolrsolrj

Solr query how to read grouped values?

I'm trying to group my documents but I don't understand how to make a combined query. Example:

<doc1>
<id>1</id>
<myid>1</myid>
<name>test</name>
</doc1>

<doc2>
<id>2</id>
<myid>1</myid>
<name>test2</name>
</doc2>

When I group on myid I get only 1 group result which is excepted. But I wonder how I could get a list of the names with that group.

something like:

<Response>
<doc>
<id>1,2</id>
<myid>1</myid>
<name>test1,test2</name>   //this
</doc>

The query I'm using:

        SolrQuery sq = new SolrQuery();
        sq.setQuery("*:*");
        sq.setStart(0);
        sq.setRows(100);
        sq.setParam("group", true);
        sq.setParam("group.field","myid");

I don't know how to read the groupresponse to get the name values for that grouped item?

I noticed there's an option to set group.limit and group.offset which allow me to get multiple results. But I'm still wondering if its possible to get a list of the 'name' fields. I think I need to facet name on the group results but I don't know how.

Solution

  • If you have Solr source code Refer to the QueryResponseTest.java JUnit and testGroupResponse() method

    SOLR-2637 is applied 3.4 onwards.

    Check out the patch SOLR-2637.patch also.