To brief you about me, I lead the Big Data team at NIO, an electric vehicle manufacturer. I have tried a fair share of the OLAP tools available on the market and here is what I think you need to know.
Apache Druid
Back in 2017, looking for an OLAP tool on the market was like seeking a tree on an African prairie—there were only a few of them. As we looked up and scanned the horizon, our eyes linger on Apache Druid and Apache Kylin. We landed on Druid because we were already been familiar with it, while Kylin, despite its impressively high query efficiency in pre-computation, had a few shortcomings: