Hi Shiju,
Thanks to your interest in DBMS development and Postgres in particular.
> I would greatly appreciate any clarification or references to relevant documentation or design discussions.
If you go to the systable_inplace_update_begin() definition you will
find that its use cases are very well documented. I recommend using a
modern text editor with goto definition / goto symbol functionality
e.g. VS Code or Zed. This will simplify the exploration of the code a
lot.
Also I believe you are on the REL_17_STABLE branch. I would recommend
choosing `master` which will become REL_19 quite soon.
--
Best regards,
Aleksander Alekseev