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checks for individual-table-size functions, since anyone in the database could get approximate values from pg_class.relpages anyway. Allow database-size to users with CONNECT privilege for the target database (note that this is granted by default). Allow tablespace-size if the user has CREATE privilege on the tablespace (which is *not* granted by default), or if the tablespace is the default tablespace for the current database (since we treat that as implicitly allowing use of the tablespace).