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https://issues.apache.org/jira/browse/SOLR-12243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668952#comment-16668952
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Uwe Schindler commented on SOLR-12243:
--------------------------------------
I agree with both of you that it's an issue for many synonyms. This was already
discussed in the Lucene issue. As long as span queries don't support the same
type of near matches (in order, out of order, with gaps) it's hard to apply the
optimization correctly. The fix would be to improve SpanNear to produce the
same query like PhraseQuery for certain slop values.
For now, Steve is right, the max clause count will protect users from
combinatoric explosion. I was suggesting to improve EDisMax to allow limiting
the number of expansions when producing bi and trigrams. As the query is very
fuzzy anyways, it might be OK to restrict the combinations (e.g., if trigrams
explode, just disable trigrams for the huge query and onyl create bigrams).
> Edismax missing phrase queries when phrases contain multiterm synonyms
> ----------------------------------------------------------------------
>
> Key: SOLR-12243
> URL: https://issues.apache.org/jira/browse/SOLR-12243
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query parsers
> Affects Versions: 7.1
> Environment: RHEL, MacOS X
> Do not believe this is environment-specific.
> Reporter: Elizabeth Haubert
> Assignee: Uwe Schindler
> Priority: Major
> Attachments: SOLR-12243.patch, SOLR-12243.patch, SOLR-12243.patch,
> SOLR-12243.patch, SOLR-12243.patch, SOLR-12243.patch, multiword-synonyms.txt,
> schema.xml, solrconfig.xml
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> synonyms.txt:
> {code}
> allergic, hypersensitive
> aspirin, acetylsalicylic acid
> dog, canine, canis familiris, k 9
> rat, rattus
> {code}
> request handler:
> {code:xml}
> <requestHandler name="/test_qparse_error" class="solr.SearchHandler">
> <lst name="defaults">
> <!-- Query settings -->
> <str name="defType">edismax</str>
> <str name="tie"> 0.4</str>
> <str name="qf">title^100</str>
> <str name="pf">title~20^5000</str>
> <str name="pf2">title~11</str>
> <str name="pf3">title~22^1000</str>
> <str name="df">text</str>
> <!-- mm If two or fewer clauses exist, they all must match.
> If three to five clauses exist, one can be missing. If six to eight clauses
> exist, all but three must match.
> If more than nine clauses exist, only require 30% to match.-->
> <str name="mm">3<-1 6<-3 9<30%</str>
> <str name="q.alt">*:*</str>
> <str name="rows">25</str>
> </lst>
> </requestHandler>
> {code}
> Phrase queries (pf, pf2, pf3) containing "dog" or "aspirin" against the
> above list will not be generated.
> "allergic reaction dog" will generate pf2: "allergic reaction", but not
> pf:"allergic reaction dog", pf2: "reaction dog", or pf3: "allergic reaction
> dog"
> "aspirin dose in rats" will generate pf3: "dose ? rats" but not pf2: "aspirin
> dose" or pf3:"aspirin dose ?"
>
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