liukun4515 opened a new issue, #2256:
URL: https://github.com/apache/arrow-rs/issues/2256
**Describe the bug**
Decimal128 as a example, we use the [u8;16] to store the value of the
decimal.
In order to compare the decimal128, we should use the signed compare order.
But the current implementation just compare the [u8;16] to get the order.
For example:
`Decimal128(-1, 10,0)`.cmp(`Decimal128(129,10,0)` will get the result of
Greater.
**To Reproduce**
```
#[test]
fn compare_i128() {
let v: i128 = -1;
let b1: [u8; 16] = v.to_le_bytes();
let b2: [u8; 16] = 129_i128.to_le_bytes();
println!("{:?}", b1);
println!("{:?}", b2);
if b1.eq(&b2) {
println!("=")
}
println!("{:?}", b1.cmp(&b2));
}
```
**Expected behavior**
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**Additional context**
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