Update datafusion/core/src/execution/context/mod.rs

Co-authored-by: Martin Grigorov <martin-g@users.noreply.github.com>

Author: erenavsarogullari

datafusion/core/src/execution/context/mod.rs

@@ -1343,7 +1343,7 @@ impl SessionContext {
                 "m" if minutes.is_none() && seconds.is_none() => minutes = Some(number),
                 "s" if seconds.is_none() => seconds = Some(number),
                 other => plan_err!(
-                    "Invalid duration, unit must be either 'm' (minutes), or 's' (seconds), and be in the correct order for '{config_name}'"
+                    "Invalid duration unit: '{other}'. The unit must be either 'm' (minutes), or 's' (seconds), and be in the correct order for '{config_name}'"
                 )?,
             }
         }