st: Sorting data puzzles

["Sergiy Radyakin" <serjradyakin@gmail.com>]

Dear All!


Here are two quotes from the Manual for Stata 9:

1) "Stata keeps track of the order of your data" [D] sort, p441

2) "It [Stata] sorts already-sorted datasets instantly, so Stata's
ignorance costs us little".

I wonder if Stata is actually making any use of this knowledge (quote
1) to optimize it's algorithms based on this additional information?
or does it only show this in the -describe- report and checks while
merging datasets?