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Re:Following a Select Statement Through Postgres Internals (... by jeffdavis on Monday April 11, 2016 @01:10AM (#11469751)
Postgres actually has a lot of that kind of documentation in the form of README files in source directories.
Re:Following a Select Statement Through Postgres Internals (... by Denzel on Monday April 11, 2016 @10:52AM (#11471866)
Absolutely! Postgres has amazing documentation.

My comment was directed towards other projects. I wish they would follow Postgres's lead.