HuSen8891 commented on code in PR #12467:
URL: https://github.com/apache/datafusion/pull/12467#discussion_r1764436517


##########
datafusion/sql/src/expr/identifier.rs:
##########
@@ -186,7 +186,22 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
                             let s = &ids[0..ids.len()];
                             // safe unwrap as s can never be empty or exceed 
the bounds
                             let (relation, column_name) = 
form_identifier(s).unwrap();
-                            Ok(Expr::Column(Column::new(relation, 
column_name)))
+                            // sanity check on column

Review Comment:
   That‘s good idea.
   Add method 'check_ambiguous_name' to check ambiguous column reference.



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