tustvold opened a new pull request, #4704:
URL: https://github.com/apache/arrow-rs/pull/4704
# Which issue does this PR close?
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Closes #.
# Rationale for this change
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Originally I wanted to avoid Scalar permitting ownership to discourage
constructions like `Vec<Scalar>`. Unfortunately this had the side-effect of
making `Scalar` quite cumbersome to use. This PR instead changes Scalar to be
generic over `T: Array`, this allows constructions like
```
Scalar<Int32Array>
Scalar<&Int32Array>
Scalar<ArrayRef>
Scalar<&ArrayRef>
```
It also allows adding constructor methods to `PrimitiveArray` and
`ByteArray`, that improve the ergonomics of constructing such scalars.
# What changes are included in this PR?
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# Are there any user-facing changes?
Yes, as `&dyn Array: ?Array` this is a breaking change.
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