Jefffrey commented on code in PR #16456:
URL: https://github.com/apache/datafusion/pull/16456#discussion_r2286808615


##########
datafusion/sql/src/expr/substring.rs:
##########
@@ -77,8 +78,16 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
             }
         }
 
-        not_impl_err!(
-            "Substring not supported by UserDefinedExtensionPlanners: 
{substring_args:?}"
-        )
+        let fun = self

Review Comment:
   This makes sense to me, yeah. Would be confusing to fall back to a user 
defined `substr` indeed 😅 



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