eejbyfeldt commented on code in PR #12608:
URL: https://github.com/apache/datafusion/pull/12608#discussion_r1774864320


##########
datafusion/sql/src/planner.rs:
##########
@@ -197,9 +197,9 @@ impl PlannerContext {
 
     /// extends the FROM schema, returning the existing one, if any
     pub fn extend_outer_from_schema(&mut self, schema: &DFSchemaRef) -> 
Result<()> {
-        self.outer_from_schema = match self.outer_from_schema.as_ref() {
-            Some(from_schema) => Some(Arc::new(from_schema.join(schema)?)),
-            None => Some(Arc::clone(schema)),
+        match self.outer_from_schema.as_mut() {
+            Some(from_schema) => Arc::make_mut(from_schema).merge(schema),
+            None => self.outer_from_schema = Some(Arc::clone(schema)),

Review Comment:
   @aalexandrov Can you help verify that this is correct? 
   
   I am not fully following your comment here: 
https://github.com/apache/datafusion/pull/11456#discussion_r1677146980 At least 
in the current code merge will still have both values for `j1_id` since they 
will have different qualifiers.



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