jayzhan211 commented on code in PR #11516:
URL: https://github.com/apache/datafusion/pull/11516#discussion_r1685423286


##########
datafusion/core/src/datasource/listing_table_factory.rs:
##########
@@ -49,16 +49,18 @@ impl ListingTableFactory {
 impl TableProviderFactory for ListingTableFactory {
     async fn create(
         &self,
-        state: &SessionState,
+        state: &dyn CatalogSession,
         cmd: &CreateExternalTable,
     ) -> Result<Arc<dyn TableProvider>> {
-        let file_format = state
+        // TODO remove downcast_ref from here. Should file format factory be 
an extension to session state?

Review Comment:
   Not sure what do you mean by this 😖 
   I think the role of FileFormat to SessionState is similar to function to 
SessionState, they are already registrable



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