What are the differences between Druid and AWS Redshift?

From Eric Tschetter’s answer via Quora: The difference you are asking about though is ParAccel vs. Druid.  ParAccel is the software that Amazon is licensing for RedShift. Aside from just potential differences in performance, there are some functional differences (these are all based on a cursory understanding of what ParAccel does, I’ve read what I could find on it, but a lot of my understanding is extracted from interpretations of marketing

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