On Thu, Feb 21, 2013 at 8:23 AM, Ramprakash Ramamoorthy
<[email protected]> wrote:
>> Can you give an example of what you mean by multi-level grouping?
>
> Say for instance, I have indexed a library, with the following fields.
> published_year, language, genre, author and title.
>
> Now my objective would be group by published_year and then by language and
> then by genre.
>
> The result would be,
>
> 2013
> English
> Thriller
> Thriller A
> Thriller B
> Thriller C
> Romance
> Romance A
> Romance B
> Spanish
> Thriller
> Thriller A
> Comedy
> Comedy A
> Comedy B
> 2012
> .....
> .....
> ....
> ....
>
>
> and so on.
>
> Hope I am clear? Thanks.
OK that makes sense, thanks.
Lucene's grouping module can't do this today, I believe, but there are
some discussions here:
https://issues.apache.org/jira/browse/SOLR-2526
about how one might go about doing so. Basically you'd need to make a
tuple value of (published_year, language, genre) and have that be your
group key.
Mike McCandless
http://blog.mikemccandless.com
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