dismax 1.4.1 and pure negative queries
Should 1.4.1 dismax query parser be able to handle pure negative queries like: q=-foo q=-foo -bar It kind of seems to me trying it out that it can NOT. Can anyone else verify? The documentation I can find doesn't say one way or another. Which is odd because the documentation for straight solr-lucene query parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that straight solr-lucene query parser_can_ handle pure negative. That seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm misinterpreting or misunderstanding my experimental results.
Re: dismax 1.4.1 and pure negative queries
Hi, It works just as expected, but not in a phrase query. Get rid of your quotes and you'll be fine. Cheers, Should 1.4.1 dismax query parser be able to handle pure negative queries like: q=-foo q=-foo -bar It kind of seems to me trying it out that it can NOT. Can anyone else verify? The documentation I can find doesn't say one way or another. Which is odd because the documentation for straight solr-lucene query parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that straight solr-lucene query parser_can_ handle pure negative. That seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm misinterpreting or misunderstanding my experimental results.
Re: dismax 1.4.1 and pure negative queries
My fault for putting in the quotes in the email, I actually don't have tests in my quotes, just tried again to make sure. And I always get 0 results on a pure negative Solr 1.4.1 dismax query. I think it does not actually work? On 3/17/2011 3:52 PM, Markus Jelsma wrote: Hi, It works just as expected, but not in a phrase query. Get rid of your quotes and you'll be fine. Cheers, Should 1.4.1 dismax query parser be able to handle pure negative queries like: q=-foo q=-foo -bar It kind of seems to me trying it out that it can NOT. Can anyone else verify? The documentation I can find doesn't say one way or another. Which is odd because the documentation for straight solr-lucene query parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that straight solr-lucene query parser_can_ handle pure negative. That seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm misinterpreting or misunderstanding my experimental results.
Re: dismax 1.4.1 and pure negative queries
Oh i see, i overlooked your first query. A query with one term that is negated will yield zero results, it doesn't return all documents because nothing matches. It's, if i remember correctly, the same as when you're looking for a field that doesn't have a value: q=-field:[* TO *]. My fault for putting in the quotes in the email, I actually don't have tests in my quotes, just tried again to make sure. And I always get 0 results on a pure negative Solr 1.4.1 dismax query. I think it does not actually work? On 3/17/2011 3:52 PM, Markus Jelsma wrote: Hi, It works just as expected, but not in a phrase query. Get rid of your quotes and you'll be fine. Cheers, Should 1.4.1 dismax query parser be able to handle pure negative queries like: q=-foo q=-foo -bar It kind of seems to me trying it out that it can NOT. Can anyone else verify? The documentation I can find doesn't say one way or another. Which is odd because the documentation for straight solr-lucene query parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that straight solr-lucene query parser_can_ handle pure negative. That seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm misinterpreting or misunderstanding my experimental results.
Re: dismax 1.4.1 and pure negative queries
purely negative queries work with Solr's default (lucene) query parser. But
don't with dismax. Or so that seems with my experience testing this out just
now, on trunk.
In chatting with Jonathan further off-list we discussed having the best of both
worlds
q={!lucene}*:* AND NOT _query_:{!dismax ...}inverse of original negative
query
But this of course requires detecting that a query is all negative. edismax
can handle purely negative, FWIW, -ipod = +(-DisjunctionMaxQuery((text:ipod))
+MatchAllDocsQuery(*:*))
Erik
On Mar 17, 2011, at 16:45 , Markus Jelsma wrote:
Oh i see, i overlooked your first query. A query with one term that is
negated
will yield zero results, it doesn't return all documents because nothing
matches. It's, if i remember correctly, the same as when you're looking for a
field that doesn't have a value: q=-field:[* TO *].
My fault for putting in the quotes in the email, I actually don't have
tests in my quotes, just tried again to make sure.
And I always get 0 results on a pure negative Solr 1.4.1 dismax query. I
think it does not actually work?
On 3/17/2011 3:52 PM, Markus Jelsma wrote:
Hi,
It works just as expected, but not in a phrase query. Get rid of your
quotes and you'll be fine.
Cheers,
Should 1.4.1 dismax query parser be able to handle pure negative queries
like:
q=-foo
q=-foo -bar
It kind of seems to me trying it out that it can NOT. Can anyone else
verify? The documentation I can find doesn't say one way or another.
Which is odd because the documentation for straight solr-lucene query
parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that
straight solr-lucene query parser_can_ handle pure negative. That
seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm
misinterpreting or misunderstanding my experimental results.
Re: dismax 1.4.1 and pure negative queries
Yeah, looks to me like two or more negated terms does the same thing,
not just one.
q=-foo -bar -baz
Also always returns zero hits. For the same reason. I understand why
(sort of), although at the same time there is a logical answer to this
question -foo -bar -baz, and oddly, 1.4.1 _lucene_ query parser _can_
handle it.
Erik Hatcher in IRC gave me one transformation of this query that still
uses dismax as a unit, but can get you a solution. (I want to use
dismax in this case for it's convenient aggregation of multiple fields
in qf, not so much for actual disjunction-maximum behavior).
defType=lucene
q=*:* AND NOT _query_:{!dismax} foo bar baz
I might be able to work with that in my situation. But it also seems
like something that dismax could take care of for you in such a
situation. It looks from the documentation like the newer (not in 1.4.1)
edismax does in at least some cases, where the pure negative query is
inside grouping/subquery parens, it's not clear to me if it does it in
general or not.
On 3/17/2011 4:45 PM, Markus Jelsma wrote:
Oh i see, i overlooked your first query. A query with one term that is negated
will yield zero results, it doesn't return all documents because nothing
matches. It's, if i remember correctly, the same as when you're looking for a
field that doesn't have a value: q=-field:[* TO *].
My fault for putting in the quotes in the email, I actually don't have
tests in my quotes, just tried again to make sure.
And I always get 0 results on a pure negative Solr 1.4.1 dismax query. I
think it does not actually work?
On 3/17/2011 3:52 PM, Markus Jelsma wrote:
Hi,
It works just as expected, but not in a phrase query. Get rid of your
quotes and you'll be fine.
Cheers,
Should 1.4.1 dismax query parser be able to handle pure negative queries
like:
q=-foo
q=-foo -bar
It kind of seems to me trying it out that it can NOT. Can anyone else
verify? The documentation I can find doesn't say one way or another.
Which is odd because the documentation for straight solr-lucene query
parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that
straight solr-lucene query parser_can_ handle pure negative. That
seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm
misinterpreting or misunderstanding my experimental results.
Re: dismax 1.4.1 and pure negative queries
On 3/17/2011 5:02 PM, Jonathan Rochkind wrote:
defType=lucene
q=*:* AND NOT _query_:{!dismax} foo bar baz
Oops, forgot a part, for anyone reading this and wanting to use it as a
solution.
You can transform:
$defType=dismax
q=-foo -bar -baz
To:
defType=lucene
q=*:* AND NOT _query_:{!dismax mm=1}foo bar baz
And have basically equivalent semantics to what you meant but which
dismax won't do. The mm=1 is important, left that out before.
Jonathan
I might be able to work with that in my situation. But it also seems
like something that dismax could take care of for you in such a
situation. It looks from the documentation like the newer (not in 1.4.1)
edismax does in at least some cases, where the pure negative query is
inside grouping/subquery parens, it's not clear to me if it does it in
general or not.
On 3/17/2011 4:45 PM, Markus Jelsma wrote:
Oh i see, i overlooked your first query. A query with one term that is negated
will yield zero results, it doesn't return all documents because nothing
matches. It's, if i remember correctly, the same as when you're looking for a
field that doesn't have a value: q=-field:[* TO *].
My fault for putting in the quotes in the email, I actually don't have
tests in my quotes, just tried again to make sure.
And I always get 0 results on a pure negative Solr 1.4.1 dismax query. I
think it does not actually work?
On 3/17/2011 3:52 PM, Markus Jelsma wrote:
Hi,
It works just as expected, but not in a phrase query. Get rid of your
quotes and you'll be fine.
Cheers,
Should 1.4.1 dismax query parser be able to handle pure negative queries
like:
q=-foo
q=-foo -bar
It kind of seems to me trying it out that it can NOT. Can anyone else
verify? The documentation I can find doesn't say one way or another.
Which is odd because the documentation for straight solr-lucene query
parser athttp://wiki.apache.org/solr/SolrQuerySyntax suggests that
straight solr-lucene query parser_can_ handle pure negative. That
seems odd that solr-lucene Q.P. can, but dismax can't? Maybe I'm
misinterpreting or misunderstanding my experimental results.
