CrateDB isn't a typical OLAP database, as joins (you might need for star-schemas, etc.) are - although not impossible - rather expensive in a distributed manner.
However it performs very well on aggregations and groupings on very large data sets, as everything is distributed ;)
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Is it suitable to use cratedb as OLAP Database with a lot of aggregation and columns grouping?
CrateDB isn't a typical OLAP database, as joins (you might need for star-schemas, etc.) are - although not impossible - rather expensive in a distributed manner.
However it performs very well on aggregations and groupings on very large data sets, as everything is distributed ;)