Hi, I have done some more analysis on this issue. I think it is related to lucene's default operator. I am getting excat results, when I sets the default operator as 'OR', but facing problem when setting the default operator as 'AND'.
The following are the lucene QueryParser outputs for both cases. Query :* TTL:store AND TTL:data OR TTL:variable *1. When lucene default operator is '*OR' *QueryParser output using toString method: * +TTL:store +TTL:data TTL:variable *2. When lucene default operator is '*AND' *QueryParser output using toString method: *+TTL:store TTL:data TTL:variable *The output of second case is confusing me. Could anybody please give me an explanation for this behavior? Thanks, Sonu On Thu, May 29, 2008 at 3:49 PM, Sonu Sudhakar <[EMAIL PROTECTED]> wrote: > Erick, > > Thanks for your reply. > > I am working with approximately 1 million documents. They are indexed in 4 > servers. Each document has multiple fields. I am using ParallelMultiSearcher > for searching purpose. > > I tried a few queries in the title(TTL) field. > > i started with a simple query without boolean operators. > > *1. TTL:data => 3733 results (all matches had "data" in title)* > > Then I tried a second one with AND operator. > > *2. TTL:data AND TTL:store => 19 results* > > I analyzed the results. the results had both "data" and "store" in the > title. > > *I then tried OR operator* > > *3. TTL:data AND TTL:store OR TTL:variable* > > I got 3,733 results., same as the query TTL:data. > > I even tried giving a meaningless query > > TTL:data AND TTL:storettttt OR TTL:variablettttt => 3,733 results (The > results were same as that of TTL:data.) > > TTL:data AND TTL:computer OR TTL:device => 3,733 results (this also showed > the same results as above) > > The same thing repeats for other cases too. The queries below also behaved > the same way. > i.e. - > > 1. TTL:store AND TTL:data OR TTL:variable => 76 results > 2. TTL:store AND TTL:datatttt OR TTL:variabletttt => 76 results > 3. TTL:store AND TTL:computer OR TTL:device => 76 results > > > 1. TTL:variable AND TTL:data OR TTL:store => 1,496 results > 2. TTL:variable AND TTL:datatttt OR TTL:storetttt => 1,496 results > 3. TTL:variable AND TTL:computer OR TTL:device => 1,496 results > > I hope you have a clearer picture of my issue now. > > Thanks, > Sonu > > > On Wed, May 28, 2008 at 7:09 PM, Erick Erickson <[EMAIL PROTECTED]> > wrote: > >> It's unclear what you *should* expect. How is your data >> distributed? >> >> In other words, how many documents do you have? In this example, >> for instance, >> 1. TTL:data AND TTL:store OR TTL:variable => 3,733 results >> it considered the TTL:data part only. >> >> it's perfecily reasonable if every document that had "variable" in the >> field *also* has "data" and "store" in the field. So your numbers >> don't give us much to work with..... >> >> Remember, though, that Lucene syntax isn't a pure boolean syntax. See >> >> http://wiki.apache.org/lucene-java/BooleanQuerySyntax >> >> And when in doubt parenthesize <G>... >> >> Best >> Erick >> >> On Wed, May 28, 2008 at 7:44 AM, Sonu Sudhakar <[EMAIL PROTECTED]> wrote: >> >> > Hi, >> > >> > I have some issue with boolean queries. >> > >> > I am using Lucene-core-2.3.1. >> > >> > I have done test on boolean query with 3 terms (data, store, variable) >> in >> > my >> > TTL field. The TTL field is indexed and searched using StandardAnalyzer. >> > >> > The three terms when searched individually gave the following result >> > >> > 1. TTL:data => 3,733 results >> > 2. TTL:store => 76 results >> > 3. TTL:variable => 1,496 results >> > >> > But found issue when combining these terms with boolean operators. >> > >> > e.g. >> > 1. TTL:data AND TTL:store OR TTL:variable => 3,733 results >> > it considered the TTL:data part only. >> > >> > 2. TTL:store AND TTL:data OR TTL:variable => 76 results >> > it considered the TTL:store part only. >> > >> > 3. TTL:variable AND TTL:data OR TTL:store => 1,496 results >> > it considered the TTL:variable part only. >> > >> > But I am getting correct result when combining terms with 'AND' >> operator. I >> > think the issue is with 'OR' operator. >> > >> > >> > Could anybody give an explanation for this behavior of lucene? >> > Could you give suggestions to rectify this? >> > >> > Thanks, >> > Sonu >> > >> > >
