zhuqi-lucas commented on code in PR #14572:
URL: https://github.com/apache/datafusion/pull/14572#discussion_r1951115943


##########
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:
   Originally i use Result<bool>, but i want to get three different error 
messages for different case, so i change to Result<(), String>.



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