This is presuming that we abandon the notion that system catalog access use SnapshotNow. Which opens the question of what they should use instead ... to which "transaction snapshot" isn't the answer, because we have to be able to do system catalog accesses before we've set the snapshot.
I wonder if it would be possible to use SnapshotNow before the transaction's snapshot has been established, and the transaction's snapshot subsequently. Although it definitely makes me nervous to use multiple snapshots over the life of a single transaction...
-Neil
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