liukun4515 commented on issue #2637:
URL: https://github.com/apache/arrow-rs/issues/2637#issuecomment-1236486886
@tustvold Do you means that you want to implement the `ArrowNativeType` for
?
I go through the code,
```
/// Trait bridging the dynamic-typed nature of Arrow (via [`DataType`]) with
the
/// static-typed nature of rust types ([`ArrowNativeType`]) for all types
that implement [`ArrowNativeType`].
pub trait ArrowPrimitiveType: 'static {
/// Corresponding Rust native type for the primitive type.
type Native: ArrowNativeType;
/// the corresponding Arrow data type of this primitive type.
const DATA_TYPE: DataType;
/// Returns the byte width of this primitive type.
fn get_byte_width() -> usize {
std::mem::size_of::<Self::Native>()
}
/// Returns a default value of this primitive type.
///
/// This is useful for aggregate array ops like `sum()`, `mean()`.
fn default_value() -> Self::Native {
Default::default()
}
}
```
But what's the `const DATA_TYPE: DataType;` for Decimal128Type?, just use
the default decimal128 type
```
const DEFAULT_TYPE: DataType =
DataType::Decimal128(DECIMAL128_MAX_PRECISION,
DECIMAL_DEFAULT_SCALE);
```
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