Hi,

There was a project done over Postgresql 9.1.1

My task now is to migrate only the modified optimizer and develop it
further on 10.4

How can I efficiently approach such a simulator? I mean I will need only to
provide specific trees and return results, not whole postgresql dbms. In
general, when I was developing over the whole postgresql it was fine as I
can create a db in the regular dbms and then just compile the modified
files and start it again over the already created database. Now I am really
not sure what should be the right and smart approach.

Can you share any advice/information/links/articles, please?

Thank you in advance!