Sequenced temporal semantics - Use further optimized rewrite to normalize min/max aggregation inputs

IITDBGroup / gprom

GProM is a middleware that adds support for provenance to database backends.

http://www.cs.iit.edu/%7edbgroup/research/gprom.php

Apache License 2.0

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Sequenced temporal semantics - Use further optimized rewrite to normalize min/max aggregation inputs #43

Open lordpretzel opened 6 years ago

lordpretzel commented 6 years ago

Currently, we apply a generic normalization that does a 4-way union to combine the interval endpoints from both inputs of the normalization. For aggregation Agg(R) we always normalize N(R,R) so a 2-way union is sufficient. Also we can try to push a pre-aggregation step.