Expand description
@kwannoel:
This module implements Serde for the Pretty struct. Why not implement it directly on our plan nodes?
That’s because Pretty already summarizes the fields that are important to us.
You can see that when explain() is called, we directly return the Pretty struct.
The proper way to do this would be to create a new data structure that plan nodes get converted into,
and then implement Serialize and Deserialize on that data structure (including to Pretty).
But that’s a lot of refactoring work.
So we just wrap Pretty in a newtype and implement Serialize on that,
since it’s a good enough intermediate representation.