Alvaro Herrera wrote:
In any case the change is a very small patch, which I attach but I
haven't tested.  This only works if the new rewriteheap stuff actually
changes Xids to follow OldestXmin, i.e. all tuples that have older
Xmin/Xmax are frozen (or marked with the current Xid).  Heikki, can you
confirm that this is the case?

No, CLUSTER doesn't freeze tuples. It could do that easily, it didn't occur to me when I wrote it. It would make it harder to debug, though, should we have any problems with it in the future.

--
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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