In fact, getting rid of vacuum full, or changing it to work like
cluster, has been proposed in the past. The use case really is pretty
narrow; cluster is a lot faster if there's a lot of unused space in the
table, and if there's not, vacuum full isn't going to do much so there's
not much point running it in the first place. The reason it exists is
largely historical, there hasn't been a pressing reason to remove it either.

I can assure you it is a great way to get back gigabytes when someone
has put no vacuum strategy in place and your 200K row table (with
about 200 bytes per row) is taking up 1.7gig!!!
Vive le truncate table, and vive le vacuum full!
:-)
Anton

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