jayzhan211 commented on code in PR #12536:
URL: https://github.com/apache/datafusion/pull/12536#discussion_r1769690622
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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:
I think it is hard to tell the role given we are in the intermediate state.
I would said all of `ColumnarValue` and `ScalarValue` and `Scalar` are physical
types now, given they have either `ArrayRef` or `DataType`
The end state in my mind is that,
`ColumnarValue` stores `ArrayRef` for multiple rows and `ScalarValue` for
single rows case.
We will have `LogicalType` which could be resolved from `DataType` given the
mapping we determined, which should be customizable as well for user defined
type. Similar to the role `Scalar` in this PR, which record the relationship
between `ScalarValue` to `DataType`.
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