[SOLR-13009] ExtendedSolrQueryParser cannot handle with KeywordRepeat, Synonyms and minShouldMatch

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 7.5
• Fix Version/s: 8.2
• Component/s: query parsers
• Assignee: Unassigned
• Reporter: Markus Jelsma
• Created: 22/Nov/18 14:35
• Updated: 12/May/22 00:31

Description

As described on the mailing list [1].

Consider this example synonym set [bier,brouw] where bier means beer and brouw is the stemmed version of brouwsel (brewage, concoction), and consider these parameters on /select:

qf=content_nl&defType=edismax&mm=2<-1 5<-2 6<90%25

The queries q=bier and q=brouw both give the desired results. However, for q=brouwsel something (partially) unexpected happens:

+(((content_nl:brouwsel Synonym(content_nl:bier content_nl:brouw))~2))

This results in a BooleanQuery where, due to mm=2, both clauses need to match, giving very few matches. Removing KeywordRepeat or setting mm=1 of course fixes the problem, but that is not what we want.

Will shortly attatch a patch containing a unit test proving the problem is real.

[1] http://lucene.472066.n3.nabble.com/KeywordRepeat-stemming-single-term-synonyms-and-minimum-should-match-edismax-td4413690.html