I wouldn't even call it that to be honest, you spend a lot of time thinking about Hadoop and HDFS files when working with Impala.
> In any case, CitusDB's home page doesn't say anything about it being a columnar database
It does, if you dig deep enough. :) https://www.citusdata.com/citus-products/cstore-fdw
But you're right that it's completely optional and not needed to access their distributed query processing.
I wouldn't even call it that to be honest, you spend a lot of time thinking about Hadoop and HDFS files when working with Impala.
> In any case, CitusDB's home page doesn't say anything about it being a columnar database
It does, if you dig deep enough. :) https://www.citusdata.com/citus-products/cstore-fdw
But you're right that it's completely optional and not needed to access their distributed query processing.