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. For extension types,
we could customize/extend the **logical type** for each `DataType`. It doesn't
make sense to have more than 1 logical type that decoded to the same physical
type, they are *equivalent* thus should be the same logical type. Even if they
have historical issue thus require more than one type for backward
compatibility, they are able to do it if they built their type on top of
Datafusion's Logical Type.
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