jayzhan211 commented on code in PR #12536:
URL: https://github.com/apache/datafusion/pull/12536#discussion_r1769691504


##########
datafusion/expr-common/src/columnar_value.rs:
##########
@@ -89,7 +91,7 @@ pub enum ColumnarValue {
     /// Array of values
     Array(ArrayRef),
     /// A single value
-    Scalar(ScalarValue),
+    Scalar(Scalar),

Review Comment:
   > remove variants of ScalarValue while still accounting for them via 
data_type
   
   
   Our first step is to minimize the variant of types, so we don't need 
`ScalarValue::Utf8`, `ScalarValue::LargeUtf8` any more but `Scalar` which has 
`ScalarValue::String` + `DataType::Utf8` or `ScalarValue::String` + 
`DataType::LargeUtf8`. We determine the actual `physical type` based on arrow's 
DataType. `ScalarValue::String` is then something close to `logical type`



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