Have you tried it without the rewrite, marked as "expert" in the javadocs?
I'm not a lucene expert but I am an experienced user and in several
years of usage I don't think I've ever had cause to call
Query.rewrite().
--
Ian.
On Wed, Jan 21, 2009 at 7:44 PM, <rolaren...@earthlink.net> wrote:
> R2.4
>
> There is much about Lucene that I do not understand, so it may be that there
> is some simple or obvious mistake I am making. I build an index, get hits
> (documents) back from it, with various non-zero scores. Now I call this code:
>
> Explanation expl = _searcher.explain(rewrite, docIndex); // always
> null!
>
> And the return value is *ALWAYS* null. The javadocs on explain() do not even
> mention that possibility. When I debug through the call, I find the
> "explanation" in this code inside class MarkupContainsQuery (which is the
> code that gets called):
>
> /**
> * @see Weight#explain(IndexReader, int)
> */
> public Explanation explain(IndexReader reader, int doc)
> throws IOException {
> if (reader == null) {
> throw new IOException("Empty reader in explain
> method");
> }
> // TODO SY - implement
>>>>>>>>>> return null;
> }
>
> This seems, um, bad, esp. as I did nothing to *decide* the type of my query,
> but merely created it from the user-entered string like this:
>
> Query query = _parser.parse(queryString);
> Query rewrite = query.rewrite(_reader);
>
> And the field _parser was created like this:
>
> Analyzer analyzer = new StandardAnalyzer();
> QueryParser parser = new QueryParser("contents", analyzer);
> _parser XMLFragmentParser(parser);
>
> So -- what's the right thing to do?
>
> thanks,
> Paul
>
>
>
>
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