Re: [HACKERS] [PROPOSAL] Use SnapshotAny in get_actual_variable_range

[Dmitriy Sarafannikov]

I think we can use RecentGlobalDataXmin for non-catalog relations and RecentGlobalXmin for catalog relations (probably a check similar to what we have in heap_page_prune_opt). I took check from heap_page_prune_opt (Maybe this check must be present as separate function?) But it requires to initialize snapshot for specific relation. Maybe we need to use GetOldestXmin()? New version of patch is attached.

snapshot_non_vacuumable_v2.patch
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