Techniques are described for optimizing the computation of OLAP ranking functions. The techniques involve push-down of the filtering operation into the window sort operation corresponding to a target ranking function. The push-down technique may be employed when a predetermined set of push-down conditions...http://www.google.es/patents/US6622138?utm_source=gb-gplus-sharePatente US6622138 - Method and apparatus for optimizing computation of OLAP ranking functions
Method and apparatus for optimizing computation of OLAP ranking functions
