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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