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Re:Umbra: an ACID-compliant database built for in-memory ana... by qaq on Sunday January 26, 2020 @08:47PM (#22156247)
ClickHouse is open source it's def not trash for olap and ts
Re:Umbra: an ACID-compliant database built for in-memory ana... by jnordwick on Monday January 27, 2020 @02:39AM (#22157528)
clickhouse could barely complete a 15 min moving average; last time I checked it required a very slow correlated subquery. That's pretty much where I stopped evaluating it.

edit: after looking it up again, looks like that is still the case, and you have have to be fairly limited with cumulative aggregates if you want the keep performance. maybe someday, but as of now, still not very good.