> I see no concurrency problems. If two or more backends visit the same
> tuple, they either write the same value to the same position which
> doesn't hurt, or one sees the other's changes which is a good thing.
AFAIR, on multi-CPU platforms it's possible that second transaction could
see COMMITTED state but still old (subtrans id) in xmin: it's not
guaranteed that changes made on CPU1 (V1 was changed first, then V2 was
changed) will appear at the same order on CPU2 (V2 may come first, then V1).
Vadim
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