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From "Jens Wille (JIRA)" <>
Subject [jira] [Commented] (SOLR-7143) MoreLikeThis Query Parser does not handle multiple field names
Date Thu, 02 Apr 2015 13:29:59 GMT


Jens Wille commented on SOLR-7143:

First of all, thanks to Vitaliy for providing patches and to Anshum for picking up this issue.

Now I'm wondering what needs to happen to move this forward. I'm new here and don't really
know what's expected of me. I have verified that the latest patch works for this particular
issue and I, too, would like to see the query parser functionality brought on par with the
handler functionality (parameters and defaults, including an {{mlt.match.include}} equivalent).

However, there's still a problem with the current approach (multiple {{qf}} parameters: yes,
comma-separated list: no): Only the latter would work properly with parameter dereferencing:

curl 'http://localhost:8983/solr/techproducts/select?q=%7B!mlt+qf=$mlt.fl%7DMA147LL/A&mlt.fl=name,features'

Sets {{qf=name,features}}, which is not split into {{name}} and {{features}} with the latest

curl 'http://localhost:8983/solr/techproducts/select?q=%7B!mlt+qf=$mlt.fl%7DMA147LL/A&mlt.fl=name&mlt.fl=features'

Sets {{qf=name}}, ignores subsequent {{mlt.fl}} parameters.

Please let me know if I can do anything.

> MoreLikeThis Query Parser does not handle multiple field names
> --------------------------------------------------------------
>                 Key: SOLR-7143
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>          Components: query parsers
>    Affects Versions: 5.0
>            Reporter: Jens Wille
>            Assignee: Anshum Gupta
>         Attachments: SOLR-7143.patch, SOLR-7143.patch
> The newly introduced MoreLikeThis Query Parser (SOLR-6248) does not return any results
when supplied with multiple fields in the {{qf}} parameter.
> To reproduce within the techproducts example, compare:
> {code}
> curl 'http://localhost:8983/solr/techproducts/select?q=%7B!mlt+qf=name%7DMA147LL/A'
> curl 'http://localhost:8983/solr/techproducts/select?q=%7B!mlt+qf=features%7DMA147LL/A'
> curl 'http://localhost:8983/solr/techproducts/select?q=%7B!mlt+qf=name,features%7DMA147LL/A'
> {code}
> The first two queries return 8 and 5 results, respectively. The third query doesn't return
any results (not even the matched document).
> In contrast, the MoreLikeThis Handler works as expected (accounting for the default {{mintf}}
and {{mindf}} values in SimpleMLTQParser):
> {code}
> curl 'http://localhost:8983/solr/techproducts/mlt?q=id:MA147LL/A&mlt.fl=name&mlt.mintf=1&mlt.mindf=1'
> curl 'http://localhost:8983/solr/techproducts/mlt?q=id:MA147LL/A&mlt.fl=features&mlt.mintf=1&mlt.mindf=1'
> curl 'http://localhost:8983/solr/techproducts/mlt?q=id:MA147LL/A&mlt.fl=name,features&mlt.mintf=1&mlt.mindf=1'
> {code}
> After adding the following line to {{example/techproducts/solr/techproducts/conf/solrconfig.xml}}:
> {code:language=XML}
> <requestHandler name="/mlt" class="solr.MoreLikeThisHandler" />
> {code}
> The first two queries return 7 and 4 results, respectively (excluding the matched document).
The third query returns 7 results, as one would expect.

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