On Sun, Feb 15, 2009 at 10:50 AM, Joel Halbert <j...@su3analytics.com> wrote: > When constructing a query, using a series of terms e.g. > > Term1=X, Term2=Y etc... > > does it make sense, like in sql, to place to most restrictive term query > first? > > i.e. if I know that the query will be mainly constrained by the value of > Term1, does having this as the first in the query make the execution of > the query any faster than if it were the second term?
No. Lucene internally reorders terms and tries to optimize stuff like this whenever possible. Disjunctions (ORs) use a priority queue to skip on the lowest term (by docid) and conjunctions (ANDs) reorder once by the highest first document (a very rough proxy for estimating term density). -Yonik http://www.lucidimagination.com --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
