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The internal representation of the most negative number in two's complement requires 1 more bit to represent the positive version. This means ABS() must promote integer types to the next highest width. Change-Id: I86cc880e78258d5f90471bd8af4caeb4305eed77 Reviewed-on: http://gerrit.cloudera.org:8080/8004 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Impala Public Jenkins