Hi,
I'm trying to get the terms that match a certain RegexpQuery. My (naive)
approach:
1. Create a RegexpQuery from the queryString (e.g. "abc.*"):
Query q = new RegexpQuery(new Term("text", queryString));
2. Rewrite the Query using the IndexReader reader:
q = q.rewrite(reader);
3. Write the terms into a previously initialized empty set terms:
Set<Term> terms = new HashSet<>();
q.extractTerms(terms);
However, this results in an empty set. I believe this is due to the fact
that the rewritten query is a ConstantScoreQuery object;
q.extractTerms(terms) does not yield any terms anyway. q.getQuery()
returns null however; according to the documentation, this should happen
when it wraps a filter which it does not, supposedly.
This is Lucene 4.0. Any hints?
Thanks!
Carsten
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