Evaluation of the Stream Query Language CQL

Abstract: There are several query languages developed for data stream management systems (DSMS), CQL (Stanford), StreamSQL (StreamBase), WaveScript (MIT), SCSQL (Uppsala University), etc. This thesis is the research phase of a two-phase project where the final goal is to provide CQL support to the Super Computer Stream Query processor (SCSQ); a DSMS developed by the Uppsala DataBase Laboratory. In this paper, the main properties of CQL, the extent to which they are implemented by the Stanford STREAM project and the expressibility of the Linear Road (LR) benchmark using CQL is investigated. An overview and comparison of SQL, CQL, StreamSQL and WaveScript is also given.