Migrating from one OLAP database to another is huge. Even if you're unhappy with your current data tool and have found some promising candidates, you might still hesitate to do the big surgery on your data architecture because you're uncertain about how things are going to work. So you need experience shared by someone who has walked the path.
Luckily, a user of Apache Doris has written down their migration process from ClickHouse to Doris, including why they need the change, what needs to be taken care of, and how they compare the performance of the two databases in their environment.