James,
I haven't used RangeQueries, but what you describe does sound confusing
to me. I'll enter it as a bug, just so this information doesn't get
lost, because I am not certain that this is really a bug, even though
it sounds like one to me.
Thanks,
Otis
--- James Ricci [EMAIL PROTECTED] wrote:
I'm replying to my own message because I think I now understand the
problem,
and part of it is, in my opinion, a bad implementation of
RangedQuery.
When you create a ranged query and omit the lower term, my
expectation would
be that I would find everything less than the upper term. Now if I
pass
false for the inclusive term, then I would expect that I would find
all
terms less than the upper term excluding the upper term itself.
What is happening in the case of lower_term=null, upper_term=x,
inclusive=false is that empty strings are being excluded because
inclusive
is set false, and the implementation of RangedQuery creates a default
lower
term of Term(fieldName, ). Since it's not inclusive, it excludes
. This
isn't what I intended, and I don't think it's what most people would
imagine
RangedQuery would do in the case I've mentioned.
I equate lower=null, upper=x, inclusive=false to Field x.
lower=null,
upper=x, inclusive=true would be Field = x. In both cases, the only
difference should be whether or not Field = x is true for the query.
I'm still quite new to Lucene, so maybe I'm wrong about all this
because I
just don't understand it well enough. If so, could someone tell me
where
I've gone astray?
Thanks much,
James
PS: The rest of the problems I had below I was able to fix by
changing how
the fields were tokenized and indexed.
-Original Message-
From: James Ricci
Sent: Thursday, June 06, 2002 11:16 AM
To: '[EMAIL PROTECTED]'
Subject:Question about RangeQuery and strings...
Hi all,
I've been having some problems using RangeQuery. I have a simple
Query
which is essentially document.field AB. Field values are:
// Empty string
A SPACE
A123456
ABC
Now I expected to find the first three of the four values (and I do
with
another commercial search engine product I've worked with). With
Lucene I
get nothing. Part of the problem I think is that there are some
issues
with case here. Changing my query to document.field ab returns:
A123456
Now I would have expected A SPACE to get returned, and I was
really
surprised that wasn't returned. I'm guessing that wasn't
returned
because no term in the field passed the query criteria, and empty
string
is not considered a term.
How should I go about getting what I expect? What is going on here?
Thanks much,
James
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