AFAIK, the difference is that the phrase slop applies to the phrase queries generated automatically by dismax and applied to the fields in "pf". Query Slop (qs) is the phrase slop applied to a phrase explicitly specified by the user, which will be applied to all the Query Fields (qf).
An easy way to understand the phrase slop, is "the number of positions that you have to move a term to have the exact phrase". For example, If you have the query "A query" (a phrase query with slop = 0) and a document that says "a simple query" It won't match, but if you have the query: "A query"~1 (a phrase query with slop = 1) Then, the document will match the phrase query, even if is not exact. I hope I'm clear enough. Tomás On Fri, Mar 11, 2011 at 12:41 PM, Bill Bell <billnb...@gmail.com> wrote: > What exactly is phrase and query slop? What technically is a slop? > > Bill Bell > Sent from mobile > > > On Mar 11, 2011, at 4:15 AM, Gastone Penzo <gastone.pe...@gmail.com> > wrote: > > > ok thank you!!! > > > > 2011/3/10 Jonathan Rochkind <rochk...@jhu.edu> > > > >> On 3/10/2011 8:15 AM, Gastone Penzo wrote: > >> > >>> Thank you very much. i understand the difference beetween qs and ps but > >>> not > >>> what pf is...is it necessary to use ps? > >>> > >> > >> It's not neccesary to use anything, including Solr. > >> > >> pf: Will take the entire query the user entered, make it into a single > >> phrase, and boost documents within the already existing result set that > >> match that phrase. pf does not change the result set, it just changes > the > >> ranking. > >> ps: Will set phrase query slop on that pf query of the entire entered > >> search string, that effects boosting. > >> > >> > >> > > > > > > -- > > Gastone Penzo >
