jayzhan211 commented on code in PR #12536:
URL: https://github.com/apache/datafusion/pull/12536#discussion_r1779319730
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datafusion/expr-common/src/columnar_value.rs:
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@@ -89,7 +91,7 @@ pub enum ColumnarValue {
/// Array of values
Array(ArrayRef),
/// A single value
- Scalar(ScalarValue),
+ Scalar(Scalar),
Review Comment:
> > we can get the LogicalType from it if each DataType has at most one
LogicalType
>
> We should not assume this to be the case. I suppose #12644 may convey why,
but even if we don't do Extension Types, this assumption will be very limiting.
I'm still not convinced why my assumption is limited. I don't think it makes
sense to have more than 1 logical type for the same DataType. Given arrow
extension type, it is more easier to map them to single logical type like
`LogicalType::UserDefined()` and carry to Datafusion.
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