Résumé
In the CoherentPaaS project, we are developing the Cloud Multidatastore Query Language (CloudMdsQL). CloudMdsQL is a functional SQL-like language, capable of querying multiple heterogeneous data stores within a single query that may contain embedded invocations to each data store's native query interface. In this paper, we introduce the problem of effcient query processing of multiple data stores with CloudMdsQL, and our approach to solve it.