kou commented on code in PR #46352:
URL: https://github.com/apache/arrow/pull/46352#discussion_r2078946273


##########
dev/archery/archery/docker/cli.py:
##########
@@ -28,12 +28,13 @@
 def _mock_compose_calls(compose):
     from types import MethodType
     from subprocess import CompletedProcess
+    from itertools import chain
 
     def _mock(compose, command_tuple):
         def _execute(self, *args, **kwargs):
             params = [f'{k}={v}'
                       for k, v in self.config.params.items()]
-            command = ' '.join(params + command_tuple + args)
+            command = ' '.join(chain(params, command_tuple, args))

Review Comment:
   Why do we need this change?
   The current code doesn't work without this, right?



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