Do not use Parquet exports if revision is passed (#6555)

* Do not use Parquet exports if revision is passed

* Remove unused revision

src/datasets/load.py

@@ -1816,10 +1816,10 @@ def dataset_module_factory(
                     raise e
             if filename in [sibling.rfilename for sibling in dataset_info.siblings]:  # contains a dataset script
                 fs = HfFileSystem(endpoint=config.HF_ENDPOINT, token=download_config.token)
-                if _require_custom_configs:
+                if _require_custom_configs or (revision and revision != "main"):
                     can_load_config_from_parquet_export = False
                 elif _require_default_config_name:
-                    with fs.open(f"datasets/{path}/{filename}", "r", revision=revision, encoding="utf-8") as f:
+                    with fs.open(f"datasets/{path}/{filename}", "r", encoding="utf-8") as f:
                         can_load_config_from_parquet_export = "DEFAULT_CONFIG_NAME" not in f.read()
                 else:
                     can_load_config_from_parquet_export = True