Comment by rotis

Exactly. This is a basic optimization technique and all the dinosaur era databases should have that. But if you build a new database product you have to implement these techniques from scratch. There is no way you shortcut that. Reminds me about CockroachDB and them building a query optimizer[1]. They started with rule based one and then switched to cost based. Feature that older databases already had.

[1] https://www.cockroachlabs.com/blog/building-cost-based-sql-o...