Snapshot Semantics for Temporal Multiset Relations (Extended Version)

@article{Dignos2019SnapshotSF,
  title={Snapshot Semantics for Temporal Multiset Relations (Extended Version)},
  author={Anton Dignos and Boris Glavic and Xing Niu and M. Bohlen and Johann Gamper},
  journal={CoRR},
  year={2019},
  volume={abs/1902.04938}
}
Snapshot semantics is widely used for evaluating queries over temporal data: temporal relations are seen as sequences of snapshot relations, and queries are evaluated at each snapshot. In this work, we demonstrate that current approaches for snapshot semantics over interval-timestamped multiset relations are subject to two bugs regarding snapshot aggregation and bag difference. We introduce a novel temporal data model based on K-relations that overcomes these bugs and prove it to correctly… CONTINUE READING
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