Because it's one of the few mature, fast, scalable analytics-oriented databases that is also completely open source.
The closest open source thing that matches its feature set is Presto, but that one is quite different.
Apache Druid is supposed to be very mature, but also very difficult to set up and manage. I've not used it myself.
There's also Vespa, but I don't know how well it performs with large numbers of columns.
A lot of people use Elasticsearch for analytics. Being based on Lucene, it's kind of columnar, and it can perform very well indeed on aggregations.
InfluxDB may be good, but it's not fully open source.
The closest open source thing that matches its feature set is Presto, but that one is quite different.
Apache Druid is supposed to be very mature, but also very difficult to set up and manage. I've not used it myself.
There's also Vespa, but I don't know how well it performs with large numbers of columns.
A lot of people use Elasticsearch for analytics. Being based on Lucene, it's kind of columnar, and it can perform very well indeed on aggregations.
InfluxDB may be good, but it's not fully open source.