Reviewing 22,000 lines of code, even from antirez, with this complex of a feature set and minimal PR description sounds like a nightmare. One starts to see why major open-source software like Postgres tends to be developed on a mailing list, with intermediate design decisions discussed by the community, separate patches for different related features, incremental review, and then a spaced release cadence.
Postgres and Redis are dramatically different projects with radically different stories, contributions and development team.
Virtually all major Redis features are a solo job of the post author.
By the way reviewers are paid good money for this and know the setup.
The code is 5000 lines of code in total, comments included:
2000 lines the sparse array.
2000 lines the t_array commands and upper layer implementation.
~500 lines of AOF / RDB code.
All the other stuff is tests, JSON command descriptions, TRE library under "deps".