ovr edited a comment on pull request #9232: URL: https://github.com/apache/arrow/pull/9232#issuecomment-792852299
> If we want to support Decimal(i128), can't we use Rust's native i128? E.g. does decimal128 + decimal128 correspond to Rust's i128 + i128, or is the math actually different? @jorgecarleitao It's using `i128` under the hood as expected (which generates to u64 and i64 by LLVM). As you know, `Decimal` has precision/scale and It's not possible to calculate the sum of two different decimals with different scales without rescaling, for example: `Decimal(1,1)` and `Decimal(1,5)`. Yet another thing, it's overflowing. `DECIMAL(1) + DECIMAL(1) = DECIMAL(1)`, example `1` + `9`. I don't know how it should be done. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
