Semantics and Evaluation Techniques for Window Aggregates in Data Streams

  title={Semantics and Evaluation Techniques for Window Aggregates in Data Streams},
  author={Jin Li and David Maier and Kristin Tufte and Vassilis Papadimos and Peter A. Tucker},
  booktitle={SIGMOD Conference},
A windowed query operator breaks a data stream into possibly overlapping subsets of data and computes a result over each. Many stream systems can evaluate window aggregate queries. However, current stream systems suffer from a lack of an explicit definition of window semantics. As a result, their implementations unnecessarily confuse window definition with physical stream properties. This confusion complicates the stream system, and even worse, can hurt performance both in terms of memory usage… CONTINUE READING
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