On Fri, 8 Dec 2017 15:12:42 -0500
Robert Haas <robertmhaas@gmail.com> wrote:
>
> Maybe a better idea is ALTER COLUMN SET COMPRESSION x1, x2, x3 ...
> meaning that x1 is the default for new tuples but x2, x3, etc. are
> still allowed if present. If you issue a command that only adds
> things to the list, no table rewrite happens, but if you remove
> anything, then it does.
>
I like this idea, but maybe it should be something like ALTER COLUMN
SET COMPRESSION x1 [ PRESERVE x2, x3 ]? 'PRESERVE' is already used in
syntax and this syntax will show better which one is current and which
ones should be kept.
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Regards,
Ildus Kurbangaliev