jayzhan211 opened a new issue, #5459:
URL: https://github.com/apache/arrow-rs/issues/5459
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
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**Describe the solution you'd like**
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I want to build Scalar with ArrayRef, but I got an err
```
error[E0277]: the trait bound
`std::sync::Arc<arrow_array::GenericListArray<i32>>: arrow_array::Array` is not
satisfied
--> datafusion/common/src/scalar/mod.rs:3352:29
|
3352 | let s = Scalar::new(arr);
| ----------- ^^^ the trait `arrow_array::Array` is not
implemented for `std::sync::Arc<arrow_array::GenericListArray<i32>>`
| |
| required by a bound introduced by this call
|
= help: the trait `arrow_array::Array` is implemented for
`std::sync::Arc<(dyn arrow_array::Array + 'static)>`
note: required by a bound in `arrow_array::Scalar::<T>::new`
-->
/Users/jayzhan/.cargo/registry/src/index.crates.io-6f17d22bba15001f/arrow-array-50.0.0/src/scalar.rs:130:9
|
130 | impl<T: Array> Scalar<T> {
| ^^^^^ required by this bound in `Scalar::<T>::new`
...
136 | pub fn new(array: T) -> Self {
| --- required by a bound in this associated function
error[E0277]: the trait bound
`std::sync::Arc<arrow_array::GenericListArray<i32>>: arrow_array::Array` is not
satisfied
--> datafusion/common/src/scalar/mod.rs:3352:17
|
3352 | let s = Scalar::new(arr);
| ^^^^^^^^^^^^^^^^ the trait `arrow_array::Array` is
not implemented for `std::sync::Arc<arrow_array::GenericListArray<i32>>`
|
= help: the trait `arrow_array::Array` is implemented for
`std::sync::Arc<(dyn arrow_array::Array + 'static)>`
note: required by a bound in `arrow_array::Scalar`
-->
/Users/jayzhan/.cargo/registry/src/index.crates.io-6f17d22bba15001f/arrow-array-50.0.0/src/scalar.rs:128:22
|
128 | pub struct Scalar<T: Array>(T);
| ^^^^^ required by this bound in `Scalar`
error[E0277]: the trait bound
`std::sync::Arc<arrow_array::GenericListArray<i32>>: arrow_array::Array` is not
satisfied
--> datafusion/common/src/scalar/mod.rs:3353:26
|
3353 | println!("{:?}", s);
| ---- ^ the trait `arrow_array::Array` is not
implemented for `std::sync::Arc<arrow_array::GenericListArray<i32>>`
| |
| required by a bound introduced by this call
|
= help: the trait `arrow_array::Array` is implemented for
`std::sync::Arc<(dyn arrow_array::Array + 'static)>`
= note: required for
`arrow_array::Scalar<std::sync::Arc<arrow_array::GenericListArray<i32>>>` to
implement `Debug`
note: required by a bound in `core::fmt::rt::Argument::<'a>::new_debug`
-->
/Users/jayzhan/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/fmt/rt.rs:100:29
|
100 | pub fn new_debug<'b, T: Debug>(x: &'b T) -> Argument<'_> {
| ^^^^^ required by this bound in
`Argument::<'a>::new_debug`
= note: this error originates in the macro `$crate::format_args_nl`
which comes from the expansion of the macro `println` (in Nightly builds, run
with -Z macro-backtrace for more info)
```
This is what the code is like which we can also find in Scalar Example, but
turns out not working
```
let arr = Arc::new(ListArray::from_iter_primitive::<Int32Type, _,
_>(vec![
Some(vec![Some(1), None, Some(2)]),
]));
let s = Scalar::new(arr);
```
I'm working on https://github.com/apache/arrow-datafusion/issues/8846, and
trying to find whether `Scalar<Arc<ListArray>>` or `Arc<Scalar<ListArray>>` is
better.
however, the previous one meets the error described above, the second one we
can only get `&dyn Array` from `fn get()`, which doesn't seem like a good way
either.
**Describe alternatives you've considered**
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you've considered.
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Remove the example that is built with ArrayRef.
**Additional context**
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