Collapsing on a field works, but expand=true does nothing

[Andy Lester <an...@petdance.com>]

I’m working on the collapse/expand functionality. I query for books, and I want to collapse my search results on their tf1flrid, basically a family ID.  I also want to do an expand so I can see what titles were collapsed out.  I’m looking at the docs here: https://solr.apache.org/guide/8_11/collapse-and-expand-results.html <https://solr.apache.org/guide/8_11/collapse-and-expand-results.html>

Here’s a gist of my working query at https://gist.github.com/petdance/34259dee2944a455341748a0e2ef2092 <https://gist.github.com/petdance/34259dee2944a455341748a0e2ef2092>

I make the query, I get back 18 titles.  There are rows in the result that have duplicated tf1flrid fields. This is what I expect.

Then I try it again, 

curl "$URL" --silent --show-error \
    -X POST \
    -F "q=title_tracings_t:\"$Q\"" \
    -F 'fl=title,flrid,tf1flrid' \
    -F 'fq={!collapse field=tf1flrid nullPolicy=expand}' \
    -F 'expand=true' \
    -F 'rows=50' \
    -F 'sort=tf1flrid asc' \
    -F 'wt=json' \
    | jq -S .

and here’s the results: https://gist.github.com/petdance/f203c7c2bf0178e0d0c1596999801ae5 <https://gist.github.com/petdance/f203c7c2bf0178e0d0c1596999801ae5>

I get back 12 titles, and the rows with duplicated tf1flrid values that were duplicated in the first query (1638JX7 and 1638PQ3 ) have been collapsed. That’s also as I expect. However, I don’t have an “expand” section that shows what the collapsed fields were.  I don’t see any errors in my solr.log.

What am I doing wrong?  What do I need to do to get the expand section to be returned?

Thanks,
Andy

Re: Collapsing on a field works, but expand=true does nothing

[Andy Lester <an...@petdance.com>]

> Is it possible that the expand component isn't registered in your
> deployment? The expand component is a default component but have you
> overridden the defaults?

Yes, that’s exactly what happened.  Turns out that I had pulled out the unused handlers.

Thanks,
Andy 

Re: Collapsing on a field works, but expand=true does nothing

[Joel Bernstein <jo...@gmail.com>]

I just did a quick check on Solr 9 and expand / collapse was working. Here
is the output:

https://gist.github.com/joel-bernstein/6f7f3ee12d5375630f3311c5dbd693ee

Is it possible that the expand component isn't registered in your
deployment? The expand component is a default component but have you
overridden the defaults?

Joel Bernstein
http://joelsolr.blogspot.com/


On Tue, May 31, 2022 at 12:49 PM Andy Lester <an...@petdance.com> wrote:

> I’m working on the collapse/expand functionality. I query for books, and I
> want to collapse my search results on their tf1flrid, basically a family
> ID.  I also want to do an expand so I can see what titles were collapsed
> out.  I’m looking at the docs here:
> https://solr.apache.org/guide/8_11/collapse-and-expand-results.html <
> https://solr.apache.org/guide/8_11/collapse-and-expand-results.html>
>
> Here’s a gist of my working query at
> https://gist.github.com/petdance/34259dee2944a455341748a0e2ef2092 <
> https://gist.github.com/petdance/34259dee2944a455341748a0e2ef2092>
>
> I make the query, I get back 18 titles.  There are rows in the result that
> have duplicated tf1flrid fields. This is what I expect.
>
> Then I try it again,
>
> curl "$URL" --silent --show-error \
>     -X POST \
>     -F "q=title_tracings_t:\"$Q\"" \
>     -F 'fl=title,flrid,tf1flrid' \
>     -F 'fq={!collapse field=tf1flrid nullPolicy=expand}' \
>     -F 'expand=true' \
>     -F 'rows=50' \
>     -F 'sort=tf1flrid asc' \
>     -F 'wt=json' \
>     | jq -S .
>
> and here’s the results:
> https://gist.github.com/petdance/f203c7c2bf0178e0d0c1596999801ae5 <
> https://gist.github.com/petdance/f203c7c2bf0178e0d0c1596999801ae5>
>
> I get back 12 titles, and the rows with duplicated tf1flrid values that
> were duplicated in the first query (1638JX7 and 1638PQ3 ) have been
> collapsed. That’s also as I expect. However, I don’t have an “expand”
> section that shows what the collapsed fields were.  I don’t see any errors
> in my solr.log.
>
> What am I doing wrong?  What do I need to do to get the expand section to
> be returned?
>
> Thanks,
> Andy