Revert changes in common and test query

Author: tasfia8

pandas/core/dtypes/common.py

@@ -179,13 +179,7 @@ def is_object_dtype(arr_or_dtype) -> bool:
     >>> is_object_dtype([1, 2, 3])
     False
     """
-    from pandas.core.arrays.string_ import StringDtype
-
-    return (
-        isinstance(arr_or_dtype, np.dtype)
-        and arr_or_dtype == "object"
-        or isinstance(arr_or_dtype, StringDtype)
-    )
+    return _is_dtype_type(arr_or_dtype, classes(np.object_))
 
 
 def is_sparse(arr) -> bool:

pandas/tests/frame/test_query_eval.py

@@ -160,15 +160,11 @@ def test_query_empty_string(self):
             df.query("")
 
     def test_query_duplicate_column_name(self, engine, parser):
-        df = DataFrame(
-            {
-                "A": range(3),
-                "B": range(3),
-                "C": range(3)
-            }
-        ).rename(columns={"B": "A"})
+        df = DataFrame({"A": range(3), "B": range(3), "C": range(3)}).rename(
+            columns={"B": "A"}
+        )
 
-        res = df.query('C == 1', engine=engine, parser=parser)
+        res = df.query("C == 1", engine=engine, parser=parser)
 
         expect = DataFrame([[1, 1, 1]], columns=["A", "A", "C"], index=[1])