Hmmm, maybe I'm wrong and it does support AND. Looking at the code I
don't see why it wouldn't, actually. Though I believe I've seen it
documented that it isn't supported (or at least not advertised to
support). Ok, from the dismax wiki page it says: "This query handler
supports an extremely simplified subset of the Lucene QueryParser
syntax. Quotes can be used to group phrases, and +/- can be used to
denote mandatory and optional clauses". Only special single
characters are escaped. So AND/OR must work. Learn something new
every day!
Erik
On Jun 17, 2010, at 8:28 PM, Tommy Chheng wrote:
Thanks, Erik. that does work. I misunderstood the documentation, i
thought "clause" meant "field" rather than the terms in the query.
If dismax doesn't support the operator AND, why would the query
"solr/select?q=fuel+cell" and "solr/select?q=fuel+AND+cell" get
parsed differently(it adds the + for the AND query) and have
different result count?
@tommychheng
Programmer and UC Irvine Graduate Student
Find a great grad school based on research interests: http://gradschoolnow.com
On 6/17/10 5:17 PM, Erik Hatcher wrote:
dismax does not support the operator AND. It uses +/- only.
set mm=100% (not 1), as Hoss said, and try your query again.
Erik
On Jun 17, 2010, at 8:08 PM, Tommy Chheng wrote:
I don't think setting the mm helps.
I have mm to 1 which means the query terms should be in at least
one field. Both query strings satisfy this condition.
The query "solr/select?q=fuel+cell" is parsed as
"querystring":"fuel cell",
"parsedquery":"+((DisjunctionMaxQuery((text:fuel |
organization_name_ws_lc:fuel^5.0)) DisjunctionMaxQuery((text:cell
| organization_name_ws_lc:cell^5.0)))~1) ()",
"parsedquery_toString":"+(((text:fuel |
organization_name_ws_lc:fuel^5.0) (text:cell |
organization_name_ws_lc:cell^5.0))~1) ()",
returns ~900 results
The query "solr/select?q=fuel+AND+cell" is parsed as
"querystring":"fuel AND cell",
"parsedquery":"+(+DisjunctionMaxQuery((text:fuel |
organization_name_ws_lc:fuel^5.0)) +DisjunctionMaxQuery((text:cell
| organization_name_ws_lc:cell^5.0))) ()",
"parsedquery_toString":"+(+(text:fuel |
organization_name_ws_lc:fuel^5.0) +(text:cell |
organization_name_ws_lc:cell^5.0)) ()",
returns ~80 results
(this is the behavior i want for query "fuel cell" because it adds
the extra +). I want to do this without adding the AND for every
query.
@tommychheng
Programmer and UC Irvine Graduate Student
Find a great grad school based on research interests: http://gradschoolnow.com
On 6/17/10 4:19 PM, Chris Hostetter wrote:
: I'm using the dismax request handler and want to set the
default operator to
: AND.
: Using the standard handler, i could just use the q.op or
defaultOperator in
: the schema, but this doesn't work using the dismax request
handler.
:
: For example, if I call "solr/select/?q=fuel+cell", I want solr
to handle it as
: a "solr/select/?q=fuel+AND+cell"
Please consult the dismax docs...
http://wiki.apache.org/solr/DisMaxRequestHandler#mm_.28Minimum_.27Should.27_Match.29
dismax uses the "mm" param to decide how clauses that don't have an
explicit operator will be dealt with -- the default is to require
100% of
the terms, so if you aren't seeing that behavior then you have a
solrconfig.xml that that sets the default mm value to something
else.
Starting with Solr 4.0 (and mybe 3.1 if it's backported) the
default mm
will be based on the value of q.op (see SOLR-1889 for more details)
-Hoss
