Hi, Using mm=1 with (e)dismax is not a good idea. Your user will be unhappy. Because there in no coord factor with this parser. coord is about : "Typically, a document that contains more of the query's terms will receive a higher score than another document with fewer query terms."
I suggest you to use something more restrictive : "3<-1 6<80%" I think there is a new feature autoRelax in some ticket. Even better start with mm=100% and relax mm value until you retrieve *enough* documents. It is OK to use default operator of OR with default operator because coord factor kicks in. http://lucene.apache.org/core/3_0_3/api/all/org/apache/lucene/search/Similarity.html#formula_coord https://wiki.apache.org/solr/DisMaxQParserPlugin#mm_.28Minimum_.27Should.27_Match.29 Ahmet On Sunday, March 30, 2014 12:21 PM, Jack Krupansky <j...@basetechnology.com> wrote: 1. Yes, the default for mm is 1. 2. It depends on what you are really trying to do - you haven't told us. Generally, mm=1 is equivalent to q.op=OR, and mm=100% is equivalent to q.op=AND. Generally, use q.op unless you really know what you are doing. Generally, the intent of mm is to set the minimum number of OR/SHOULD clauses that must match on the top level of a query. -- Jack Krupansky -----Original Message----- From: S.L Sent: Sunday, March 30, 2014 2:25 AM To: solr-user@lucene.apache.org Subject: eDismax parser and the mm parameter Hi All, I am planning to use the eDismax query parser in SOLR to give boost to documents that have a phrase in their fields present. Now there is a mm parameter in the edismax parser query , since the query typed by the user could be of any length (i.e. >=1) I would like to set the mm value to 1 . I have the following questions regarding this parameter. 1. Is it set to 1 by default ? 2. In my schema.xml the defaultOperator is set to "AND" should I set it to "OR" inorder for the edismax parser to be effective with a mm of 1? Thanks in advance!
