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Date: Mon, 11 Feb 2008 09:54:33 -0500
Subject: RE: QueryParser vs own QueryBuilder
Thread-Topic: QueryParser vs own QueryBuilder
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From: "Granroth, Neal V." <neal.granroth@thermofisher.com>

Martin,

It is important to remember that Search(...) does not work from the text re=
presentation of the Query object that you see when you use the ToString() m=
ethod.  Instead it works from the type of objects of which the Query object=
 is composed and the clauses that join them together.

It is entirely possible that there is a bug or operational quirk in ToStrin=
g(), which makes your two Query objects look identical even when they are n=
ot.  (For example, maybe your QueryBuilder is inserting a null Term that ca=
uses the search to fail, but that ToString() does not list since it is null=
, meaningless, term.)

Another possibility to look at is your "internalSearcher" object.  Are you =
absolutely sure that it is being constructed in exactly the same way for bo=
th searches?

-- Neal

-----Original Message-----
From: Martin Nilsson [mailto:mffmartin@gmail.com]
Sent: Sunday, February 10, 2008 12:42 PM
To: lucene-net-user@incubator.apache.org
Subject: QueryParser vs own QueryBuilder

Hi,

I'm struggling with a problem I can't solve. I create my Query object from
my own implemented query builder. However, I don't get any results back but
if I do a query.ToString and send it to the QueryParser I get result. Let m=
e
show you some code.

//this doesn't return any results
//query.ToString() =3D "+category:general +product_type:1763 +title:\"shirt
brewality\" +country:2 +whitelabel:5 +price_type:1"
ISearchResult<ITinyItem> searchResult2 =3D searcher.Search(query);

//this returns 4 results
//query.Clone().ToString() =3D "+category:general +product_type:1763
+title:\"shirt brewality\" +country:2 +whitelabel:5 +price_type:1"
ISearchResult<ITinyItem> searchResult =3D searcher.Search(query.Clone
().ToString());

//this is called from query.Clone().ToString() above
public ISearchResult<T> Search(string searchTerms)
{
  if (string.IsNullOrEmpty(searchTerms)) throw new
ArgumentNullException("searchTerms");

  QueryParser parser =3D new QueryParser(defaultField, analyzer);
  parser.SetFuzzyMinSim(fuzzyMinSimilarity);
  Query query =3D parser.Parse(searchTerms);
  //the one that doesn't return any results calls below (Search(Query))
directly.
  //So the only, what I can see, difference is the code above in this
function
  return Search(query);
}

//and both are calling this
public ISearchResult<T> Search(Query query)
{
  //query.ToString() returns below result for BOTH, the one that returns 0
and the one that returns 4 result, queries
  //"+category:general +product_type:1763 +title:\"shirt brewality\"
+country:2 +whitelabel:5 +price_type:1"
  Hits hits =3D internalSearcher.Search(query);
  //code to create result
  ...
}

I have looked at the types of the underlying query and they are also the
same. BooleanQuery with 6 clauses where 5 are term queries and one, title,
is a phrase query. Looks the same both for my query and the one that
QueryParser.Parse creates.

I'm sooo confused! Please help!

Br,
Martin