That's right, but understand that my understanding of SOLR is limited to what I know about Lucene and reading this list. So anyone who *really* understands the guts of SOLR should jump right in here <G>.
Erick On Jan 25, 2008 12:11 PM, Ravish Bhagdev <[EMAIL PROTECTED]> wrote: > I see, thanks a lot for this, makes things clear now. > > So just to make sure I understand this bit, by "injecting synonyms at > query time" you mean basically adding terms implicitly to keywords > behind the scenes before passing it to solr? Or is there are more > conventional method or interface that is being suggested? > > Thanks for all the help! > > Ravish > > On Jan 25, 2008 3:59 PM, Erick Erickson <[EMAIL PROTECTED]> wrote: > > To me, it's really a question of where the work should be done given > your > > problem space. Injecting synonyms at index time allows the queries to be > > simpler/faster. Injecting the synonyms at query time gets complex but is > > more flexible. > > > > As always, it's a time/space tradeoff. If you're willing to pay the > space > > penalty for increased query speed, inject at index time. Otherwise > > you can inject at query time. > > > > And the query-time injection performance hit may not be trivial. > Consider, > > for instance, span queries. Do you want to pay the price at query time > for, > > say a BooleanQuery that is composed of 5 SpanQueries where each > > term in each SpanQuery consists of several OR clauses because of > > synonym injection? Perhaps you do and perhaps you don't. It all depends > > upon what your data looks like and what your performance criteria are. > > > > And you can do other tricks. Consider rather than indexing all the > terms, > > only index the canonical term. That is, consider "hit" and the synonyms > > "strike", "popular", "punch". you could index "hit" for any of the 4 > terms, > > then do the same substitution for your query. Which would make your > > index smaller *and* your queries faster. > > > > But you're right. Injecting synonyms at index time really requires a > fixed > > synonym list that doesn't vary by user. So if you want synonym > > lists on a per-user basis, you're probably going to have to inject > synonyms > > at query time. > > > > Best > > Erick > > > > > > On Jan 25, 2008 9:46 AM, Ravish Bhagdev <[EMAIL PROTECTED]> > wrote: > > > > > Yes, I'm fairly new as well. > > > > > > So do you mean adding words to the query effectively doing an "or" > > > between synonymous terms? That sounds simple way of doing it, if this > > > works, what makes indexing with synonyms useful? > > > > > > Ravish > > > > > > On Jan 25, 2008 2:42 PM, Jon Lehto <[EMAIL PROTECTED]> wrote: > > > > Hi Ravish, > > > > > > > > You may want to think about the synonym dictionary as being a tool > on > > > the side, rather than each indexed document having a copy of the > synonyms. > > > At indexing time, one might normalize synonyms to a single value, and > at > > > query time do the same to get the match. > > > > > > > > Alternately, use the synonym dictionary at run-time to expand a > > > > user's query terms, like a thesaurus. > > > > > > > > That said, I'm new to the tool, and not clear on how synonyms are > > > implemented. > > > > > > > > Jon > > > > ===================== > > > > From: Ravish Bhagdev <[EMAIL PROTECTED]> > > > > Date: 2008/01/25 Fri AM 08:24:33 CST > > > > To: solr-user@lucene.apache.org > > > > Subject: Is it possible to add synonyms run time? > > > > > > > > > > > > As I understood from available documentation, synonyms need to be > > > > defined before starting the indexing process. Is it possible to add > > > > synonyms at run time such that all index fields of all documents get > > > > updated? Does it work for newly added documents atleast? > > > > > > > > Also, how to make each user of application define his own set of > > > > synonyms that others should be oblivious to (others get normal > results > > > > without synon considered) > > > > > > > > Thanks, > > > > Ravish > > > > > > > > > > > > > >
