A common approach to this problem is to include the spellcheck component and, if there are corrections, include a "Did you mean ..." link in the results page.
-----Original Message----- From: Walter Underwood [mailto:wun...@wunderwood.org] Sent: Wednesday, July 15, 2015 10:36 AM To: solr-user@lucene.apache.org Subject: Re: Which default Boolean operator to set, AND or OR? The AND default has one big problem. If the user misspells a single word, they get no results. About 10% of queries are misspelled, so that means a lot more failures. wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ (my blog) On Jul 15, 2015, at 7:21 AM, Jack Krupansky <jack.krupan...@gmail.com> wrote: > It is simply precision (AND) vs. recall (OR) - the former tries to > limit the total result count, while the latter tries to focus on > relevancy of the top results even if the total result count is higher. > > Recall is good for discovery and browsing, where you sort of know what > you generally want, but not exactly with any great precision. > > Recall will include results that almost meet the query terms, but > maybe some are missing. > > Precision will guarantee and insist that all query terms are present. > > One great example for recall is a plagiarism query - enter all the > terms for a passage and then find documents that most closely > approximate the passage without being necessarily exact matches. IOW, > the plagiarizer changes a word here and there. > > -- Jack Krupansky > > On Wed, Jul 15, 2015 at 8:16 AM, Steven White <swhite4...@gmail.com> wrote: > >> Hi Everyone, >> >> Out-of-the box, Solr (Lucene?) is set to use OR as the default >> Boolean operator. Can someone tell me the advantages / disadvantages >> of using OR or AND as the default? >> >> I'm leaning toward AND as the default because the more words a user >> types, the narrower the result set should be. >> >> Thanks >> >> Steve >> ************************************************************************* This e-mail may contain confidential or privileged information. If you are not the intended recipient, please notify the sender immediately and then delete it. TIAA-CREF *************************************************************************
