alamb commented on code in PR #22114:
URL: https://github.com/apache/datafusion/pull/22114#discussion_r3634402201


##########
datafusion/functions/src/datetime/common.rs:
##########
@@ -41,6 +45,52 @@ const ERR_NANOSECONDS_NOT_SUPPORTED: &str = "The dates that 
can be represented a
 
 static UTC: LazyLock<Tz> = LazyLock::new(|| "UTC".parse().expect("UTC is 
always valid"));
 
+/// Convert a `NaiveDate` into a `ScalarValue` matching `target_type`. The Date
+/// variants encode the bare date; Timestamp variants are anchored at the
+/// date's midnight in the given timezone. Returns `None` for unsupported
+/// target types.
+pub(crate) fn date_to_scalar(

Review Comment:
   What do you think about making this a method on ScalarValue (like 
`ScalarValue::try_from_date`, matching the existing methods like 
https://docs.rs/datafusion/latest/datafusion/common/enum.ScalarValue.html#method.try_from_string)?
 
   
   That might make it easier to discover in the future



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