Enabled ruff rule PGH003

Author: Spaarsh

pyproject.toml

@@ -95,7 +95,7 @@ ignore = [
     # "FBT003",
     # "C416",
     # "SIM102",
-    "PGH003",
+    # "PGH003",
     "PLR2004",
     "PERF401",
     "PD901",

python/datafusion/dataframe.py

@@ -517,7 +517,8 @@ def join(
             and isinstance(on[0], list)
             and isinstance(on[1], list)
         ):
-            join_keys = on  # type: ignore
+            # We know this is safe because we've checked the types
+            join_keys = on  # type: ignore[assignment]
             on = None
 
         if join_keys is not None: