TableAM: The *size functions (e.g. dbsize.c) are too heap specific.

[Eulerizeit]

We've submitted a patch for this already.

https://www.postgresql.org/message-id/flat/qzfAa10e5AbhOq0M7O4g-uXfn0E-sKyL1W6Lj6-4Eifz0bujH6OGYqBDvmo9wx3T1Twau-3z3PL383IL4NQPQ9oPj6IJYJgfboeuTB0FJM0%3D%40protonmail.com

We need to get attention then agree upon and focus on a solution.

Currently dbsize.c ignores the access methods and goes to the file system to examine the size. This needs to be considered in both the TableAM and IndexAM.

A fix can be assesses with both AO and Zedstore in Postgres.