Note that if you only have two fields A and B, you could make it faster by returning `docFreq(A)+docFreq(B)-IndexSearcher.count(A AND B)` rather than `IndexSearcher.count(A OR B)` since Lucene is typically faster at running conjunctions than disjunctions.
Le mer. 20 juil. 2016 à 15:41, Xiaolong Zheng <zhengxiaol...@gmail.com> a écrit : > Thanks! The use case that I am having is I am trying to calculate the > docFreq for the suggestion word which produced by my "did you > mean"/"spellcheck" feature. > > I was trying to avoid to having a second search request. But it seems in > this case, I have to formula another search query to do the job. > > > > Sincerely, > > --Xiaolong > > > On Wed, Jul 20, 2016 at 9:31 AM, Adrien Grand <jpou...@gmail.com> wrote: > > > There is no way to get this statistic in constant-time. If you need it > for > > scoring, you need to make approximations. For instance, BlendedTermQuery > > uses the max of the doc freqs as the aggregated doc freq. > > > > Otherwise, you can also compute this number by running a BooleanQuery > with > > one SHOULD clause per field. > > > > Le mar. 19 juil. 2016 à 19:08, Xiaolong Zheng <zhengxiaol...@gmail.com> > a > > écrit : > > > > > Hi, > > > > > > I want to know is there any way that query the doc frequency across > > > multiple search field? > > > > > > The existing API seems only provide the query for a single search > field: > > > > > > > > > indexReader.docFreq(new Term(field, word)) > > > > > > > > > Any suggestions that I could get the doc frequency from multiple field? > > > > > > Thanks in Advance, > > > > > > --Xiaolong > > > > > >
