Re: Operators and Minimum Match with Dismax handler
: I have an index which we are setting the default operator to AND. : Am I right in saying that using the dismax handler, the default operator in : the schema file is effectively ignored? (This is the conclusion I've made : from testing myself) correct. : The issue I have with this, is that if I want to include an OR in my phrase, : these are effectively getting ignored. The parser is still trying to match : 100% of the search terms : : e.g. 'lucene OR query' still only finds matches for 'lucene AND query' : the parsed query is: +(((drug_name:lucen) (drug_name:queri))~2) () correct. dismax isn't designed to be used that way (it's a fluke of the implementation that using AND works at all) : Does anyone have any advise as to how I could deal with this kkind of : problem? i would set your mm to something smaller and let your users use + when they want to make something required. if you really want to support the AND/OR/NOT type sequence ... don't use dismax: that type of syntax is what the standard parser is for. -Hoss
RE: Operators and Minimum Match with Dismax handler
I'm using dismax with the default operator set to AND, and don't use Minimum Match (commented out in solrconfig.xml), meaning 100% of the terms must match. Then in my application logic I use a regex that checks if the query contains OR , and if it does I add mm=1 to the solr request to effectively turn the query into an OR. This trick doesn't work for complex boolean queries but works for simple xxx OR yyy. -Original Message- From: Chris Hostetter [mailto:hossman_luc...@fucit.org] Sent: 18/03/2009 10:45 AM To: solr-user@lucene.apache.org Subject: Re: Operators and Minimum Match with Dismax handler : I have an index which we are setting the default operator to AND. : Am I right in saying that using the dismax handler, the default operator in : the schema file is effectively ignored? (This is the conclusion I've made : from testing myself) correct. : The issue I have with this, is that if I want to include an OR in my phrase, : these are effectively getting ignored. The parser is still trying to match : 100% of the search terms : : e.g. 'lucene OR query' still only finds matches for 'lucene AND query' : the parsed query is: +(((drug_name:lucen) (drug_name:queri))~2) () correct. dismax isn't designed to be used that way (it's a fluke of the implementation that using AND works at all) : Does anyone have any advise as to how I could deal with this kkind of : problem? i would set your mm to something smaller and let your users use + when they want to make something required. if you really want to support the AND/OR/NOT type sequence ... don't use dismax: that type of syntax is what the standard parser is for. -Hoss CLSA CLEAN GREEN: Please consider our environment before printing this email. The content of this communication is subject to CLSA Legal and Regulatory Notices. These can be viewed at https://www.clsa.com/disclaimer.html or sent to you upon request.
Operators and Minimum Match with Dismax handler
Hi All, I have a question regarding the dismax handler and minimum match (mm=) I have an index which we are setting the default operator to AND. Am I right in saying that using the dismax handler, the default operator in the schema file is effectively ignored? (This is the conclusion I've made from testing myself) So I have set the mm value to 100% The issue I have with this, is that if I want to include an OR in my phrase, these are effectively getting ignored. The parser is still trying to match 100% of the search terms e.g. 'lucene OR query' still only finds matches for 'lucene AND query' the parsed query is: +(((drug_name:lucen) (drug_name:queri))~2) () I know I could programatically set the mm=0 if my phrase contains certain keywords, however this would get very complicated with more terms in the phrase (I'd have to preserve/inject operators to keep my default) and I assume I would effectively be duplicating what dismax handler does for the most part already. Does anyone have any advise as to how I could deal with this kkind of problem? Thanks Waseem
