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postgres/contrib/pg_upgrade
Bruce Momjian 29add0de49 In pg_upgrade, copy fsm, vm, and extent files by checking for file
existence via open(), rather than collecting a directory listing and
looking up matching relfilenode files with sequential scans of the
array.  This speeds up pg_upgrade by 2x for a large number of tables,
e.g. 16k.

Per observation by Ants Aasma.
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