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Decimal

Exact decimal number, mirroring Rust's `rust_decimal::Decimal`: a 96-bit unsigned integer mantissa, a base-10 scale and a sign. value = (hi << 64 | lo) / 10^scale, negated when `negative` is true Example: lo=12345, hi=0, scale=2, negative=false represents 123.45. Decoding in Rust (with the `rust_decimal` crate): let lo = (d.lo & 0xFFFF_FFFF) as u32; let mid = (d.lo >> 32) as u32; let value = Decimal::from_parts(lo, mid, d.hi, d.negative, d.scale); Decoding in Python (E-notation string: exact regardless of the decimal context's precision, and faster than dividing by 10^scale): from decimal import Decimal mantissa = (d.hi << 64) | d.lo value = Decimal(f"{'-' if d.negative else ''}{mantissa}E-{d.scale}")

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Show Proto definition

schema.proto

message Decimal {
  uint64 lo = 1;
  uint32 hi = 2;
  uint32 scale = 3;
  bool negative = 4;
}

Fields

The number on the right of each row is the protobuf field number.

louint641

Low 64 bits of the 96-bit mantissa.

hiuint322

High 32 bits of the 96-bit mantissa.

scaleuint323

Number of decimal digits after the point, i.e. the power of ten the mantissa is divided by. At most 28.

negativebool4

True when the value is negative.

Decode via an exact decimal type, never a float. In Python the E-notation form is exact regardless of the decimal context’s precision, and faster than dividing by 10^scale:

from decimal import Decimal

mantissa = (d.hi << 64) | d.lo
value = Decimal(f"{'-' if d.negative else ''}{mantissa}E-{d.scale}")

In Rust, with the rust_decimal crate:

let lo = (d.lo & 0xFFFF_FFFF) as u32;
let mid = (d.lo >> 32) as u32;
let value = Decimal::from_parts(lo, mid, d.hi, d.negative, d.scale);

Last modified on October 1, 2026

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