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We've grown 2 versions of pg_size_pretty over the years, one for BIGINT and one for NUMERIC. Both should output the same, but keeping them in sync is harder than needed due to neither function sharing a source of truth about which units to use and how to transition to the next largest unit. Here we add a static array which defines the units that we recognize and have both pg_size_pretty and pg_size_pretty_numeric use it. This will make adding any units in the future a very simple task. The table contains all information required to allow us to also modify pg_size_bytes to use the lookup table, so adjust that too. There are no behavioral changes here. Author: David Rowley Reviewed-by: Dean Rasheed, Tom Lane, David Christensen Discussion: https://postgr.es/m/CAApHDvru1F7qsEVL-iOHeezJ+5WVxXnyD_Jo9nht+Eh85ekK-Q@mail.gmail.com