zhuqi-lucas commented on code in PR #14572:
URL: https://github.com/apache/datafusion/pull/14572#discussion_r1952299587


##########
datafusion/common/src/dfschema.rs:
##########
@@ -1028,20 +1028,48 @@ impl SchemaExt for Schema {
             })
     }
 
-    fn logically_equivalent_names_and_types(&self, other: &Self) -> bool {
+    // There are three cases we need to check
+    // 1. The len of the schema of the plan and the schema of the table should 
be the same
+    // 2. The nullable flag of the schema of the plan and the schema of the 
table should be the same
+    // 3. The datatype of the schema of the plan and the schema of the table 
should be the same
+    fn logically_equivalent_names_and_types(&self, other: &Self) -> Result<(), 
String> {

Review Comment:
   Thank you @jayzhan211 for this good suggestion, i change my code to use 
result<()>, it seems it's enough for this case, similar with many other cases, 
for example:
   
   ```rust
   /// Check if the schema have some fields with the same name
       pub fn check_names(&self) -> Result<()> {
      }
   ```



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