Luca Ferrari <fluca1...@infinito.it> writes:
> I'm just curious to know why after a drop table the disk file is emptied but 
> still existent. What is the reason why the file is not deleted immediately?

It's protecting against some obscure race condition involving
reassignment of the relfilenode number to a new table.  I forget the
details but you could troll the archives for it if you really care
--- I think we put that in about two or so years ago.

                        regards, tom lane

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