Chapman Flack <> writes:
> But let me return to the earlier idea for a moment: are you saying
> that it might *not* be sufficient to find an applicable snapshot at
> the time of constructing the object, and register that snapshot
> on TopTransactionResourceOwner?

The problem is to know which snapshot is applicable; if the transaction
has more than one, you don't know which was used to read the row of
interest.  I suppose you could be conservative and use the oldest one,
if snapmgr lets you find that.

                        regards, tom lane

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