Andres Freund <andres(at)anarazel(dot)de> writes:
> Another approach is to extend the SatisfiesDirty approach and store the tid of
> the next tuple version in addition the xmin/xmax we already store. And have
> heap_fetch() always set t_data to NULL if the snapshot check fails.
That seems like a fairly clean idea, although I think we can't use it
in the back branches without an ABI break. We're not going to find a
TID's worth of padding space in struct SnapshotData.
regards, tom lane