[Solrj 4.0] No group response

[Roman Slavík <sl...@gmail.com>]

Hi guys,

I have problem with grouping in Solr 4.0 using Solrj api. I need this: 
search some documents limited with solr query, group them by one field 
and return total count of groups.
There is param 'group.ngroups' for adding groups count into group 
response. Sounds easy, so I wrote something like this:

         SolrQuery query = new SolrQuery().setQuery(queryString);
         query.addField("score");

         query.setParam(GroupParams.GROUP, true);
         query.setParam(GroupParams.GROUP_MAIN, true);
         query.setParam(GroupParams.GROUP_FIELD, "group_field");
         query.setParam(GroupParams.GROUP_LIMIT, "1");
         query.setParam(GroupParams.GROUP_TOTAL_COUNT, true);

         QueryResponse response = 
solrServer.query(query);                         // contains found docs
         GroupResponse groupResponse = response.getGroupResponse(); // null

Search result is ok, QueryResponse contains docs I searched for. But 
group response is always null. Did I miss something, some magic 
parameter for enabling group response?

Thanks for any advice

Roman

Re: [Solrj 4.0] No group response

[Roman Slavik <sl...@gmail.com>]

Thanks! When I switched GroupParams.GROUP_MAIN to false it works.



--
View this message in context: http://lucene.472066.n3.nabble.com/Solrj-4-0-No-group-response-tp4023439p4023940.html
Sent from the Solr - User mailing list archive at Nabble.com.

Re: [Solrj 4.0] No group response

[Chris Hostetter <ho...@fucit.org>]

:         query.setParam(GroupParams.GROUP_MAIN, true);
	...
:         GroupResponse groupResponse = response.getGroupResponse(); // null
: 
: Search result is ok, QueryResponse contains docs I searched for. But group
: response is always null. Did I miss something, some magic parameter for
: enabling group response?

By using GROUP_MAIN = true, you've told the grouping code you wnat it to 
flatten the grouping results and return them in the format of a single 
DocList result -- so there is no GroupResponse included...

https://wiki.apache.org/solr/FieldCollapsing

"We can optionally use the results of a group command as the "main" result 
(i.e. a single flat document list that would normally be produced by a 
non-grouped query request) by adding the parameter group.main=true. 
Although this result format does not have as much information, it may be 
easier for existing solr clients to parse."

If you want the "rich" grouping response, you need to use 
GROUP_MAIN=false.


-Hoss

Re: [Solrj 4.0] No group response

[Kissue Kissue <ki...@gmail.com>]

Here is how i have previously used grouping. Note i am using Solr 3.5:

SolrQuery query = new SolrQuery("");
query.setRows(GROUPING_LIMIT);
query.setParam("group", Boolean.TRUE);
query.setParam("group.field", "GROUP_FIELD");

This seems to work for me.



On Fri, Nov 30, 2012 at 1:17 PM, Roman Slavík <sl...@gmail.com> wrote:

> Hi guys,
>
> I have problem with grouping in Solr 4.0 using Solrj api. I need this:
> search some documents limited with solr query, group them by one field and
> return total count of groups.
> There is param 'group.ngroups' for adding groups count into group
> response. Sounds easy, so I wrote something like this:
>
>         SolrQuery query = new SolrQuery().setQuery(**queryString);
>         query.addField("score");
>
>         query.setParam(GroupParams.**GROUP, true);
>         query.setParam(GroupParams.**GROUP_MAIN, true);
>         query.setParam(GroupParams.**GROUP_FIELD, "group_field");
>         query.setParam(GroupParams.**GROUP_LIMIT, "1");
>         query.setParam(GroupParams.**GROUP_TOTAL_COUNT, true);
>
>         QueryResponse response = solrServer.query(query);
>         // contains found docs
>         GroupResponse groupResponse = response.getGroupResponse(); // null
>
> Search result is ok, QueryResponse contains docs I searched for. But group
> response is always null. Did I miss something, some magic parameter for
> enabling group response?
>
> Thanks for any advice
>
> Roman
>