update comment

Author: adriangb

datafusion/common/src/config.rs

@@ -312,11 +312,9 @@ config_namespace! {
         pub default_null_ordering: String, default = "nulls_max".to_string()
 
         /// When set to true, ORDER BY clauses in subqueries and CTEs will be preserved
-        /// rather than being optimized away. By default this is false for SQL standard
-        /// compliance, as ORDER BY in subqueries has no guaranteed effect on the final
-        /// result ordering. Enable this if you need deterministic ordering within
-        /// subquery results, such as for streaming output or specific application requirements.
-        pub preserve_subquery_order: bool, default = false
+        /// rather than being optimized away. By default this is false which
+        /// allows more optimizations and is SQL compliant but may cause unexpected results.
+        pub preserve_subquery_order: bool, default = true
     }
 }