Hi,
I have been playing around with the MoreLikeThis-query handler in
Solr/Lucene. I am in a situation where I think that I can improve the
quality of the LikeThis-documents significantly by restricting the
MoreLikeThis-query to documents where one field has its term in a
specified range. That is, I would like to add a RangeQuery to the
default MoreLikeThis query.
The default behaviour of the MoreLikeThis-method in Lucene, is to
construct the query by adding terms like:
BooleanQuery query = new BooleanQuery();
tq = new TermQuery(new Term("field", "word");
query.add(tq, BooleanClause.Occur.SHOULD);
I would like to also add a range restriction as,
rq = new
ConstantScoreRangeQuery("time",startTimeString,endTimeString,true,true);
query.add(rq, BooleanClause.Occur.MUST);
This is all made in
contrib/queries/src/java/org/apache/lucene/search/similar/MoreLikeThis.java
However, this does not work at all when running from Solr (no MLT
suggestions are returned). I suspect that the problem is that the
MoreLikeThisHandler in
src/java/org/apache/solr/handler/MoreLikeThisHandler.java
does not perform a standard query, but a getDocList:
results.docList = searcher.getDocList(mltQuery, filters, null,
start, rows, flags);
and that this type of query does not handle a RangeQuery. Is this
correct, or what is the problem with adding a RangeQuery? Should it be
added in the "filters" part? How can I modify this in order to
restrict the suggested documents to documents in the specified range?
All hints are appreciated.
/Clas
Frisim.com
