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From "Paul Elschot (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-7615) SpanSynonymQuery
Date Mon, 02 Jan 2017 13:04:58 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-7615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paul Elschot updated LUCENE-7615:
---------------------------------
    Attachment: LUCENE-7615.patch

Patch of 2 Jan 2017.

This can be used as proximity subquery whenever SynonymQuery is used now, i.e. for synonym
terms.

I think this improves span scoring somewhat, see the tests and the test output when uncommenting
showQueryResults for the test cases with two terms.

Implementation:
SynonymQuery exposes new methods getField() and SynonymWeight.getSimScorer() for use in SpanSynonymQuery.

Improved use of o.a.l.index.Terms and TermsEnum in SynonymQuery, at most a single TermsEnum
will be used.
Aside: how about renaming Terms to FieldTerms?

This takes DisjunctionSpans out of SpanOrQuery.
This adds SynonymSpans as (an almost empty) subclass of DisjunctionSpans, for later further
scoring improvement.

PHRASE_TO_SPAN_TERM_POSITIONS_COST is used from SpanTermQuery and made package private there.


> SpanSynonymQuery
> ----------------
>
>                 Key: LUCENE-7615
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7615
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>    Affects Versions: master (7.0)
>            Reporter: Paul Elschot
>            Priority: Minor
>         Attachments: LUCENE-7615.patch
>
>
> A SpanQuery that tries to score as SynonymQuery.



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