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https://issues.apache.org/jira/browse/SOLR-11662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16266393#comment-16266393
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ASF GitHub Bot commented on SOLR-11662:
---------------------------------------
Github user dsmiley commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/275#discussion_r153109462
--- Diff:
solr/core/src/java/org/apache/solr/parser/SolrQueryParserBase.java ---
@@ -330,6 +339,19 @@ public void setAllowSubQueryParsing(boolean
allowSubQueryParsing) {
this.allowSubQueryParsing = allowSubQueryParsing;
}
+ /**
+ * Set how overlapping query terms should be scored, as if they're the
same term,
--- End diff --
I think some reference to "synonyms" here would be helpful to people
understanding, even if this applies to cases that aren't necessarily synonyms
in the strict sense. For example after "overlapping query terms" add a
parenthetical: "(e.g. synonyms)"
Heck, maybe we should call this `SynonymQueryStyle`? After all, we're
overriding `newSynonymQuery` to do the work, thus Lucene has picked the name
for us.
> Make overlapping query term scoring configurable per field type
> ---------------------------------------------------------------
>
> Key: SOLR-11662
> URL: https://issues.apache.org/jira/browse/SOLR-11662
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Doug Turnbull
> Fix For: 7.2, master (8.0)
>
>
> This patch customizes the query-time behavior when query terms overlap
> positions. Right now the only option is SynonymQuery. This is a fantastic
> default & improvement on past versions. However, there are use cases where
> terms overlap positions but don't carry exact synonymy relationships. Often
> synonyms are actually used to model hypernym/hyponym relationships using
> synonyms (or other analyzers). So the individual term scores matter, with
> terms with higher specificity (hyponym) scoring higher than terms with lower
> specificity (hypernym).
> This patch adds the fieldType setting scoreOverlaps, as in:
> {code:java}
> <fieldType name="text_general" scoreOverlaps="pick_best"
> class="solr.TextField" positionIncrementGap="100" multiValued="true">
> {code}
> Valid values for scoreOverlaps are:
> *as_one_term*
> Default, most synonym use cases. Uses SynonymQuery
> Treats all terms as if they're exactly equivalent, with document frequency
> from underlying terms blended
> *pick_best*
> For a given document, score using the best scoring synonym (ie dismax over
> generated terms).
> Useful when synonyms not exactly equilevant. Instead they are used to model
> hypernym/hyponym relationships. Such as expanding to synonyms of where terms
> scores will reflect that quality
> IE this query time expansion
> tabby => tabby, cat, animal
> Searching "text", generates the dismax (text:tabby | text:cat | text:animal)
> *as_distinct_terms*
> (The pre 6.0 behavior.)
> Compromise between pick_best and as_oneSterm
> Appropriate when synonyms reflect a hypernym/hyponym relationship, but lets
> scores stack, so documents with more tabby, cat, or animal the better w/ a
> bias towards the term with highest specificity
> Terms are turned into a boolean OR query, with documen frequencies not blended
> IE this query time expansion
> tabby => tabby, cat, animal
> Searching "text", generates the boolean query (text:tabby text:cat
> text:animal)
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