Re: How to know the matched field?

[Paul Libbrecht]

Here's my first approach but I note that, typically, I have fields (which are not stored) which may be the matching field but still not be the one I want to return. Typically, I have a field "names in all languages along the standard- analyzer" which is not the one I want to "see as matched".

        query = query.rewrite(this.getReader());
        QueryScorer scorer = new QueryScorer(query);
        String found = null;
        float maxScore = 0;
        for(Field f: (List<Field>) doc.getFields()) {
            String text = f.stringValue();

            TokenStream tok = analyzer
                    .tokenStream(f.name(),new StringReader(text));

            Token t=new Token();
            while(tok!=null && (t=tok.next(t))!=null) {
                float s = scorer.getTokenScore(t);
            }

            float score = scorer.getFragmentScore();
            if(score > maxScore) {
                maxScore = score;
                found = text;
            }
        }




paul


Le 23-mars-09 à 11:35, Paul Libbrecht a écrit :

scorer.startFragment(new TextFragment(new StringBuffer(text),0,text.length())); System.out.println("Field: " + f + ":: " +f.name() + ": " + f.stringValue()); I still don't grasp why there's TextFragment(stringbuffer) and the pass through the tokenizers but removing any of them breaks my unit- test. I guess this is the whole idead behind LUCENE-1522 which I would up-take later.

Thanks Erick,

I browsed but no full answer yet.







paul

Le 22-mars-09 à 22:22, Erick Erickson a écrit :

The closest seems to be the explain method with which I could find the exact term-query or prefix-query that matched it, so I would be able to find the name of the field. I am still left with iterating through the (stored) fields and try to find the individual fields that matched. I could also make a token-stream with all fields' contents and find the field (the fragment) which gets the best score with QueryScorer(query)? (provided query is "rewritten" so that no prefixquery appears anymore, right?) Sounds doable but please confirm this is a correct usage of QueryScorer, I am feeling a bit unsafe here.

Try searching the mail archives, the searchable archive is linked to

the solutions...

off the Wiki. This topic has been discussed multiple times but I forget On Sun, Mar 22, 2009 at 4:30 PM, Paul Libbrecht <p...@activemath.org> wrote:

in an auto-completion task, I would like to show to the user the field

that's been matched against the query in the found document.


that?


exact field found.

thanks in advance

paul

Typically, my documents have multiple fields for each field-name and I would like the index's findings to give me the field used. How can I do It seems to me a task of the highlighter (or of the QueryScorer?) but I am actually not interested into extracting the fragment found just to know the

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