paleolimbot commented on code in PR #23169:
URL: https://github.com/apache/datafusion/pull/23169#discussion_r3509308962
##########
datafusion/expr/src/expr_schema.rs:
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@@ -69,18 +69,43 @@ pub trait ExprSchemable {
-> Result<(DataType, bool)>;
}
-/// Derives the output field for a cast expression from the source field.
+/// Derives the output field for a cast expression from the source and target
fields.
+///
+/// Metadata handling:
Review Comment:
I didn't quite get there today, but we can add this to the documentation.
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