Make properties in phyiscal-plan/aggregates public #12021
Description
Is your feature request related to a problem or challenge?
We're working on building out streaming functionality datafusion via the Denormalized project. In order to support streaming aggregates, we need access to various properties and functions that are currently private, or public only to the physical-plan crate.
Describe the solution you'd like
Make certain properties and functions public.
Describe alternatives you've considered
Duplicating the relevant files into our code base so we can control the visibility of different methods, structs, and properties.
Additional context
We're trying to avoid duplicating datafusion code into our codebase which often means we need to access things that are marked private.