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Update nbtree README's "Scans during Recovery".

Peter Geoghegan <pg@bowt.ie>

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Commit: 9067b83955da5fde49a2605510900e6d9fa273af
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2019-12-17T01:11:35Z
Releases: 13.0 
Update nbtree README's "Scans during Recovery".

get_actual_variable_range() hasn't used a dirty snapshot since commit
3ca930fc3, which invented a new snapshot type specifically to meet
selfuncs.c's requirements (HeapTupleSatisfiesNonVacuumable() type
snapshots were added).

Discussion: https://postgr.es/m/CAH2-Wzn2pSqEOcBDAA40CnO82oEy-EOpE2bNh_XL_cfFoA86jw@mail.gmail.com

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src/backend/access/nbtree/README modified +4 −10

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