[SOLR-7143] MoreLikeThis Query Parser does not handle multiple field names

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.0
• Fix Version/s: 5.3
• Component/s: query parsers
• Assignee: Anshum Gupta
• Reporter: Jens Wille
• Created: 23/Feb/15 16:37
• Updated: 26/Aug/15 13:05
• Resolved: 07/Jul/15 17:51

Description

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:

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'

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):

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'

After adding the following line to example/techproducts/solr/techproducts/conf/solrconfig.xml:

<requestHandler name="/mlt" class="solr.MoreLikeThisHandler" />

The first two queries return 7 and 4 results, respectively (excluding the matched document). The third query returns 7 results, as one would expect.

Issue Links

• is related to: SOLR-2798 Local Param parsing does not support multivalued params