Merge remote-tracking branch 'upstream/main' into fix/to-datetime-with-origin

* upstream/main:
  CI: test with last few released versions for numpy and pyarrow (pandas-dev#64165)

Author: Sharl0tteIsTaken

pandas/tests/extension/test_arrow.py

@@ -3991,3 +3991,11 @@ def test_timestamp_reduction_consistency(unit, method):
         f"{method} for {unit} returned {type(result)}"
     )
     assert result.unit == unit
+
+
+def test_fillna_zero():
+    # https://github.com/pandas-dev/pandas/issues/62878 - specific pyarrow bug
+    ser = pd.Series([1, 2, 3, 4, pd.NA, 6], dtype="int64[pyarrow]")
+    result = ser.fillna(0)
+    expected = pd.Series([1, 2, 3, 4, 0, 6], dtype="int64[pyarrow]")
+    tm.assert_series_equal(result, expected)

pandas/tests/frame/methods/test_drop_duplicates.py

@@ -514,3 +514,14 @@ def test_drop_duplicates_set():
     result = df.drop_duplicates({"AAA", "B"}, keep=False)
     expected = df.loc[[0]]
     tm.assert_frame_equal(result, expected)
+
+
+def test_drop_duplicates_with_empty_missing():
+    # https://github.com/pandas-dev/pandas/issues/62611 - specific bug with pyarrow
+    df = DataFrame(data={"A": ["a", "b", "", "a", None, "b"]})
+    df["B"] = "b"
+    result = df.drop_duplicates()
+    expected = DataFrame(
+        data={"A": ["a", "b", "", None], "B": ["b", "b", "b", "b"]}, index=[0, 1, 2, 4]
+    )
+    tm.assert_frame_equal(result, expected)