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https://issues.apache.org/jira/browse/LUCENE-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Preetam Rao updated LUCENE-1853:
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Remaining Estimate: (was: 336h)
Original Estimate: (was: 336h)
> SubPhraseQuery for matching and scoring sub phrase matches.
> -----------------------------------------------------------
>
> Key: LUCENE-1853
> URL: https://issues.apache.org/jira/browse/LUCENE-1853
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Environment: Lucene/Java
> Reporter: Preetam Rao
> Priority: Minor
> Attachments: LUCENE-1853.patch, LUCENE-1853.patch
>
>
> The goal is to give more control via configuration when searching using user
> entered queries against multiple fields where sub phrases have special
> significance.
> For a query like "homes in new york with swimming pool", if a document's
> field matches only "new york" it should get scored and it should get scored
> higher than two separate matches "new" and "york". Also, a 3 word sub phrase
> match must gets scored considerably higher than a 2 word sub phrase match.
> (boost factor should be configurable)
> Using shingles for this use case, means each field of each document needs to
> be indexed as shingles of all (1..N)-grams as well as the query. (Please
> correct me if I am wrong.)
> The query could also support
> - ignoring of idf and/or field norms, (so that factors outside the document
> don't influence scoring)
> - consider only the longest match (for example match on "new york" is scored
> and considered rather than "new" furniture and "york" city)
> - ignore duplicates ("new york" appearing twice or thrice does not make any
> difference)
> This kind of query could be combined with DisMax query. For example,
> something like solr's dismax request handler can be made to use this query
> where we run a user query as it is against all fields and configure each
> field with above configurations.
> I have also attached a patch with comments and test cases in case, my
> description is not clear enough. Would appreciate alternatives or feedback.
> Example Usage:
> <code>
> // sub phrase config
> SubPhraseQuery.SubPhraseConfig conf = new
> SubPhraseQuery.SubPhraseConfig();
> conf.ignoreIdf = true;
> conf.ignoreFieldNorms = true;
> conf.matchOnlyLongest = true;
> conf.ignoreDuplicates = true;
> conf.phraseBoost = 2;
> // phrase query as usual
> SubPhraseQuery pq = new SubPhraseQuery();
> pq.add(new Term("f", term));
> pq.add(new Term("f", term));
> pq.setSubPhraseConf(conf);
> Hits hits = searcher.search(pq);
> </code>
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