title: open issues in parallel query optimization sigmod record. authors: waqar hasan , patrick valduriez , daniela florescu. venue: nan. year: 1996.0
title: outerjoin simplification and reordering for query optimization acm transactions on database systems ( tods ). authors: c &#233; sar galindo-legaria , arnon rosenthal. venue: nan. year: 1997.0