Developer of Apache Doris (an analytic database like ClickHouse) here. Kinda proud of what we've achieved lately but also want more input from HN. These are the nine methods we've done to make "30,000 QPS per node" happen (ignore the promotional discourse if it bothers you): (https://doris.apache.org/blog/High_concurrency) trying to collect advice for improvement, like what you are looking for in an OLAP engine?