arucil commented on issue #655:
URL: https://github.com/apache/arrow-rs/issues/655#issuecomment-898813445
I couldn't figure out how to add another `impl FromIterator` for
`PrimitiveArray`. At first I simply copy the impl block of
`FromIterator<Option<T>>` and delete `Option`,
```rust
impl<T: ArrowPrimitiveType, Ptr: Borrow<Option<<T as
ArrowPrimitiveType>::Native>>>
FromIterator<Ptr> for PrimitiveArray<T>
{ ... }
impl<T: ArrowPrimitiveType, Ptr: Borrow<<T as ArrowPrimitiveType>::Native>>
FromIterator<Ptr> for PrimitiveArray<T>
{ ... }
```
however this yields a
> conflicting implementations of trait `std::iter::FromIterator<_>` for type
`array::array_primitive::PrimitiveArray<_>`
error.
Then I changed `Option<T>` to an additional generic parameter `U:
Into<Option<T>>`,
```rust
impl<T: ArrowPrimitiveType, Ptr: Borrow<U>, U: Into<Option<T::Native>>>
FromIterator<Ptr> for PrimitiveArray<T>
{ ... }
```
This didn't work either. This yields a `the type parameter U is not
constrained by the impl trait, self type, or predicates` error.
Any help is appreciated.
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