jayzhan211 commented on issue #12622:
URL: https://github.com/apache/datafusion/issues/12622#issuecomment-2638782736
> There should be no function for creating a ScalarValue from a physical
object or DataType.
I think getting `Scalar` from `DataType` or `ArrayRef` makes sense, so the
restriction of this doesn't seem sound to me.
`Scalar::try_from(DataType::Utf8View).into_value()` lost the `DataType` so
it should only be used if we don't care about the `DataType`.
> The problem with both approaches is that, once a test case fails, all
debugging happens at runtime
Is it possible to carry `Scalar` along where we know the `DataType`? If not,
what might be the case?
> There should be no method for creating a physical object from a
ScalarValue without a DataType
This makes sense to me.
Getting `Array` from `ScalarValue` is valid since physical type is tightly
coupled by `ScalarValue`. When we switch to `Scalar`, `ScalarValue` no longer
contains physical type, so we can only transform `Scalar` which contains
`DataType` to `Array`.
> Scalar{ value: ScalarValue::Utf8("test"), data_type:
DataType::Utf8View}.into_value().to_array()
I agree, this is incorrect since `into_value()` no longer contains
`DataType` so we can only call `to_array()` from `Scalar`.
I think the approach you mentioned are only possible if `Scalar` exists? Do
you have any idea that is possible to work on `main` branch?
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