Fixed invalid ref

Signed-off-by: Alexey Kudinkin <ak@anyscale.com>

Author: alexeykudinkin

python/ray/data/_internal/execution/operators/hash_shuffle.py

@@ -1146,7 +1146,7 @@ def __init__(
     ):
         super().__init__(
             name_factory=(
-                lambda num_partitions: f"Shuffle(key_columns={self._key_columns}, num_partitions={num_partitions})"
+                lambda num_partitions: f"Shuffle(key_columns={key_columns}, num_partitions={num_partitions})"
             ),
             input_ops=[input_op],
             data_context=data_context,