Update core/src/execution/datafusion/expressions/cast.rs

Co-authored-by: comphead <comphead@users.noreply.github.com>

core/src/execution/datafusion/expressions/cast.rs

@@ -174,7 +174,7 @@ impl Cast {
             DataType::Int64 => {
                 cast_utf8_to_integral!(string_array, eval_mode, Int64Type, cast_string_to_i64)?
             }
-            _ => unreachable!("invalid integral type in cast from string"),
+            dt => unreachable!(format!("invalid integral type {dt} in cast from string")),
         };
         Ok(cast_array)
     }