I think you're talking about doing denormalization before importing data into an OLAP system to avoid subsequent joins. However, this greatly limits the flexibility of data modeling. Moreover, denormalization can be a headache-inducing process. In fact, I have tested StarRocks (https://github.com/StarRocks/starrocks), and it is capable of performing joins while streaming data imports, and the speed is very fast. It's worth giving it a try.