bq: I do not understand why anyone would ever use facet.prefix or facet.contains for any use other than a development...
Gotta disagree a bit here. AFAIK, it depends on the number of unique terms in the field. How would either one be worse than facet.field? And you can freely use facet.field on a very large corpus. The difficulty with prefix and contains is that you potentially create a huge number of buckets. If you control that problem, they're perfectly reasonable. That said, I totally agree that blindly using either one without constraints is a fine way to be "surprised" when you unleash it on a "real" corpus. Especially on, say, text fields. FWIW On Thu, Jul 23, 2015 at 2:45 AM, Alessandro Benedetti <benedetti.ale...@gmail.com> wrote: > Hi Dave and Markus, > I would definitely suggest to use the *Suggester Component* . > In particular, for your use case I suggest the AnalyzingInfixLookup > strategy . > > As usual i suggest : > > Erick's post - http://lucidworks.com/blog/solr-suggester/ > My post - > http://alexbenedetti.blogspot.co.uk/2015/07/solr-you-complete-me.html > Official Documentation - Suggester Solr wiki > <https://cwiki.apache.org/confluence/display/solr/Suggester> > > Changing the analysis chain Markus can be useful, but probably we would > need more info from the user to design that. > > Cheers > > > 2015-07-23 10:13 GMT+01:00 Markus Jelsma <markus.jel...@openindex.io>: > >> Hello - You should index your terms as n-grams indeed, especially for >> autocompletion. I do not understand why anyone would ever use facet.prefix >> or facet.contains for any use other than a development tool. It won't >> perform on any index larger than small. >> >> Jan Høydahl has put up a thorough example for any Solr-user can >> understand years ago, it'll help you make a decent autocomplete and >> improve understanding of Lucene and Solr: >> http://www.cominvent.com/2012/01/25/super-flexible-autocomplete-with-solr/ >> >> -----Original message----- >> > From:Lo Dave <dav...@hotmail.com> >> > Sent: Thursday 23rd July 2015 3:18 >> > To: solr-user@lucene.apache.org >> > Subject: RE: Performance of facet contain search in 5.2.1 >> > >> > Yes. I am going to provide autocomplete with facet count as rank.i.e. >> when yours input "owe a duty", the system will suggest "xxx owe a duty yyy" >> with highest count. >> > Thanks. >> > Dave >> > > Date: Wed, 22 Jul 2015 14:35:40 +0100 >> > > Subject: Re: Performance of facet contain search in 5.2.1 >> > > From: benedetti.ale...@gmail.com >> > > To: solr-user@lucene.apache.org >> > > >> > > I think as usually Erick says, this is a X-Y problem. >> > > I think the user was trying to solve the infix autocomplete problem >> with >> > > faceting. >> > > >> > > We should get from him the initial problem to try to suggest a better >> > > solution. >> > > >> > > Cheers >> > > >> > > 2015-07-22 14:01 GMT+01:00 Markus Jelsma <markus.jel...@openindex.io>: >> > > >> > > > Hello - why not index the facet field as n-grams? It blows up the >> index >> > > > but is very fast! >> > > > Markus >> > > > >> > > > -----Original message----- >> > > > > From:Erick Erickson <erickerick...@gmail.com> >> > > > > Sent: Tuesday 21st July 2015 21:36 >> > > > > To: solr-user@lucene.apache.org >> > > > > Subject: Re: Performance of facet contain search in 5.2.1 >> > > > > >> > > > > "contains" has to basically examine each and every term to see if >> it >> > > > > matches. Say my >> > > > > facet.contains=bbb. A matching term could be >> > > > > aaabbbxyz >> > > > > or >> > > > > zzzbbbxyz >> > > > > >> > > > > So there's no way to _know_ when you've found them all without >> > > > > examining every last >> > > > > one. So I'd try to redefine the problem to not require that. If >> it's >> > > > > absolutely required, >> > > > > you can do some interesting things but it's going to inflate your >> index. >> > > > > >> > > > > For instance, "rotate" words (assuming word boundaries here). So, >> for >> > > > > instance, you have >> > > > > a text field with "my dog has fleas". Index things like >> > > > > my dog has fleas|my dog has fleas >> > > > > dog has fleas my|my dog has fleas >> > > > > has fleas my dog|my dog has fleas >> > > > > fleas my dog has|my dog has fleas >> > > > > >> > > > > Literally with the pipe followed by the original text. Now all your >> > > > > contains clauses are >> > > > > simple prefix facets, and you can have the UI split the token on >> the >> > > > > pipe and display the >> > > > > original. >> > > > > >> > > > > Best, >> > > > > Erick >> > > > > >> > > > > On Tue, Jul 21, 2015 at 1:16 AM, Lo Dave <dav...@hotmail.com> >> wrote: >> > > > > > I found that facet contain search take much longer time than >> facet >> > > > prefix search. Do anyone have idea how to make contain search faster? >> > > > > > org.apache.solr.core.SolrCore; [concordance] webapp=/solr >> path=/select >> > > > >> params={q=sentence:"duty+of+care"&facet.field=autocomplete&indent=true&facet.prefix=duty+of+care&rows=1&wt=json&facet=true&_=1437462916852} >> > > > hits=1856 status=0 QTime=5 org.apache.solr.core.SolrCore; >> [concordance] >> > > > webapp=/solr path=/select >> > > > >> params={q=sentence:"duty+of+care"&facet.field=autocomplete&indent=true&facet.contains=duty+of+care&rows=1&wt=json&facet=true&facet.contains.ignoreCase=true} >> > > > hits=1856 status=0 QTime=10951 >> > > > > > As show above, prefix search take 5 but contain search take 10951 >> > > > > > Thanks. >> > > > > > >> > > > >> > > >> > > >> > > >> > > -- >> > > -------------------------- >> > > >> > > Benedetti Alessandro >> > > Visiting card - http://about.me/alessandro_benedetti >> > > Blog - http://alexbenedetti.blogspot.co.uk >> > > >> > > "Tyger, tyger burning bright >> > > In the forests of the night, >> > > What immortal hand or eye >> > > Could frame thy fearful symmetry?" >> > > >> > > William Blake - Songs of Experience -1794 England >> > >> > > > > -- > -------------------------- > > Benedetti Alessandro > Visiting card - http://about.me/alessandro_benedetti > Blog - http://alexbenedetti.blogspot.co.uk > > "Tyger, tyger burning bright > In the forests of the night, > What immortal hand or eye > Could frame thy fearful symmetry?" > > William Blake - Songs of Experience -1794 England
