Tom Lane wrote:
It's removing potentially-important data without any notice or recourse
to the user.  There seems to be a contingent around here that thinks
that as soon as xmin is older than GlobalXmin it is no longer of
interest to anyone, but I have lost count of how often I have found it
invaluable for forensic purposes.  I have resisted having VACUUM freeze
tuples before they've reached a quite-respectable age, and I object to
having CLUSTER do it either.

How about freezing anything older than vacuum_freeze_min_age, just like VACUUM does?

I could maybe accept a CLUSTER FREEZE option to do this, but that's not
what's in the patch.

I wouldn't like to add more options to CLUSTER, people are already confused about the similar VACUUM options.

  Heikki Linnakangas

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