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Instead of Abs() for int64, use the C standard functions labs() or llabs() as appropriate. Define a small wrapper around them that matches our definition of int64. (labs() is C90, llabs() is C99.) Reviewed-by: Zhang Mingli <zmlpostgres@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/flat/4beb42b5-216b-bce8-d452-d924d5794c63%40enterprisedb.com