HaoYang670 commented on code in PR #2006:
URL: https://github.com/apache/arrow-rs/pull/2006#discussion_r914338039
##########
arrow/src/array/array_decimal.rs:
##########
@@ -32,7 +32,16 @@ use crate::datatypes::{
DECIMAL_MAX_SCALE,
};
use crate::error::{ArrowError, Result};
-use crate::util::decimal::{BasicDecimal, Decimal128};
+use crate::util::decimal::{BasicDecimal, Decimal128, Decimal256};
+use std::marker::PhantomData;
+
+pub struct GenericDecimalArray<T: BasicDecimal, const VALUE_LENGTH: i32> {
Review Comment:
Actually we need it. But just as I said in
[#2001](https://github.com/apache/arrow-rs/issues/2001#issuecomment-1174489633),
this is an unstable, which is the major disadvantage of using `const generic`.
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