HaoYang670 commented on issue #2001:
URL: https://github.com/apache/arrow-rs/issues/2001#issuecomment-1174489633
>didn't you already say it is unstable feature?
Oh, that's `const_generic_exprs`. I don't know we can use const as generic
parameter.
Sorry for the confusion.
You are right. The`const_generic` is stable but the `const_generic_exprs`
is ubstable, which means we can't add bound to the const generic so far:
(not tested)
```rust
#![feature(const_generic_exprs)]
impl<const BYTE_LENGTH> Decimal<{BYTE_LENGTH}> // const generic is stable
where {BYTE_LENGTH == 16 || BYTE_LENGTH == 32} // const generic expr is
unstable
{...}
```
This is just an alternative way to implment Decimal, DecimalArray and
DecimalArrayBuilder.
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