Am 11.03.2013 12:08, schrieb Uwe Schindler:
> This works for this query, but in general you have to rewrite until it is
> completely rewritten: A while loop that exits when the result of the rewrite
> is identical to the original query. IndexSearcher.rewrite() does this for
> you.
>
>> 3. Write the terms into a previously initialized empty set terms:
>> Set<Term> terms = new HashSet<>();
>> q.extractTerms(terms);
>
> Set the rewrite method to e.g. SCORING_BOOLEAN_QUERY_REWRITE, then this
> should work (after rewrite your query is a BooleanQuery, which supports
> extractTerms()).
This does work for my case, thank you! For the matter of completeness,
the full solution (for my specific case) is as follows:
Set<Term> terms = new HashSet<>();
MultiTermQuery query = new RegexpQuery(new Term("text", query));
query.setRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
BooleanQuery bq = (BooleanQuery) query.rewrite(reader);
bq.extractTerms(terms);
Regarding the application of IndexSearcher.rewrite(Query) instead: I
don't see a way to set the rewrite method there because the Query's
rewrite method does not seem to apply to IndexSearcher.rewrite().
Best,
Carsten
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