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From Chris Lamprecht <clampre...@gmail.com>
Subject Re: Finding minimum and maximum value of a field?
Date Tue, 31 May 2005 18:42:12 GMT
Lucene rewrites RangeQueries into a BooleanQuery containing a bunch of
OR'd terms.  If you have too many terms (dates in your case), you will
run into a TooManyClauses exception.  I think the default is about
1024; you can set it with BooleanQuery.setMaxClauseCount().

On 5/31/05, Kevin Burton <burton@rojo.com> wrote:
> Andrew Boyd wrote:
> 
> >How about using range query?
> >
> >private Term begin, end;
> >
> >begin = new Term("dateField",  DateTools.dateToString(Date.valueOf(<"backInTimeStringDate">)));
> >end = new Term("dateField",  DateTools.dateToString(Date.valueOf(<"farFutureStringDate">)));
> >
> >RangeQuery query = new RangeQuery(begin, end, true);
> >
> >IndexSearcher searcher = new IndexSearcher(directory);
> >
> >Hits hits = searcher.search(query);
> >
> >Document minDoc = hits.doc(0);
> >Document maxDoc = hits.doc(hits.length()-1);
> >
> >String minDateString = minDoc.get("dateField");
> >String maxDateString = maxDoc.get("dateField");
> >
> >
> >
> This certainly is an interesting solution.  How would lucene score this
> result set?  The first and last will depend on the score...
> 
> I  guess I can build up a quick test........
> 
> Kevin
> 
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