From f021bb4c017a87c0845d735481eccba8aa884fc9 Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <patrick_hoefler@gmx.net>
Date: Thu, 6 Apr 2023 14:43:13 +0200
Subject: [PATCH 1/3] BUG: segfault for null dtype in to_numpy (#52466)

(cherry picked from commit 7974ad0ba191e0a6b6bda5e0beb9669d0391b5af)
---
 doc/source/whatsnew/v2.0.1.rst       |  2 ++
 pandas/core/arrays/arrow/array.py    |  5 +++++
 pandas/tests/extension/test_arrow.py | 18 ++++++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/doc/source/whatsnew/v2.0.1.rst b/doc/source/whatsnew/v2.0.1.rst
index 4fda2cd11ce12..9071d242e25b5 100644
--- a/doc/source/whatsnew/v2.0.1.rst
+++ b/doc/source/whatsnew/v2.0.1.rst
@@ -21,6 +21,8 @@ Fixed regressions
 Bug fixes
 ~~~~~~~~~
 - Fixed bug in :func:`merge` when merging with ``ArrowDtype`` one one and a NumPy dtype on the other side (:issue:`52406`)
+- Bug in :meth:`Series.describe` not returning :class:`ArrowDtype` with ``pyarrow.float64`` type with numeric data (:issue:`52427`)
+- Fixed segfault in :meth:`Series.to_numpy` with ``null[pyarrow]`` dtype (:issue:`52443`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_201.other:
diff --git a/pandas/core/arrays/arrow/array.py b/pandas/core/arrays/arrow/array.py
index a0245be8e14c1..508d3e087413f 100644
--- a/pandas/core/arrays/arrow/array.py
+++ b/pandas/core/arrays/arrow/array.py
@@ -1024,6 +1024,11 @@ def to_numpy(
             result = np.empty(len(self), dtype=object)
             mask = ~self.isna()
             result[mask] = np.asarray(self[mask]._data)
+        elif pa.types.is_null(self._pa_array.type):
+            result = np.asarray(self._pa_array, dtype=dtype)
+            if not isna(na_value):
+                result[:] = na_value
+            return result
         elif self._hasna:
             data = self.copy()
             data[self.isna()] = na_value
diff --git a/pandas/tests/extension/test_arrow.py b/pandas/tests/extension/test_arrow.py
index 28919f496384c..acb63c8cbbb50 100644
--- a/pandas/tests/extension/test_arrow.py
+++ b/pandas/tests/extension/test_arrow.py
@@ -27,6 +27,7 @@
 import numpy as np
 import pytest
 
+from pandas._libs import lib
 from pandas.compat import (
     PY311,
     is_ci_environment,
@@ -1675,6 +1676,23 @@ def test_to_numpy_int_with_na():
     tm.assert_numpy_array_equal(result, expected)
 
 
+@pytest.mark.parametrize("na_val, exp", [(lib.no_default, np.nan), (1, 1)])
+def test_to_numpy_null_array(na_val, exp):
+    # GH#52443
+    arr = pd.array([pd.NA, pd.NA], dtype="null[pyarrow]")
+    result = arr.to_numpy(dtype="float64", na_value=na_val)
+    expected = np.array([exp] * 2, dtype="float64")
+    tm.assert_numpy_array_equal(result, expected)
+
+
+def test_to_numpy_null_array_no_dtype():
+    # GH#52443
+    arr = pd.array([pd.NA, pd.NA], dtype="null[pyarrow]")
+    result = arr.to_numpy(dtype=None)
+    expected = np.array([pd.NA] * 2, dtype="object")
+    tm.assert_numpy_array_equal(result, expected)
+
+
 def test_setitem_null_slice(data):
     # GH50248
     orig = data.copy()

From 0933a856d18a21829aa67516dc41aa6863cbd276 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Thu, 6 Apr 2023 14:19:40 -0700
Subject: [PATCH 2/3] Update pandas/core/arrays/arrow/array.py

---
 pandas/core/arrays/arrow/array.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/arrays/arrow/array.py b/pandas/core/arrays/arrow/array.py
index 508d3e087413f..3cf33ccba2b1b 100644
--- a/pandas/core/arrays/arrow/array.py
+++ b/pandas/core/arrays/arrow/array.py
@@ -1024,7 +1024,7 @@ def to_numpy(
             result = np.empty(len(self), dtype=object)
             mask = ~self.isna()
             result[mask] = np.asarray(self[mask]._data)
-        elif pa.types.is_null(self._pa_array.type):
+        elif pa.types.is_null(self._data.type):
             result = np.asarray(self._pa_array, dtype=dtype)
             if not isna(na_value):
                 result[:] = na_value

From 3f05be0ef8953185e1b9df9cd9d56e3a6ac36540 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Thu, 6 Apr 2023 14:19:45 -0700
Subject: [PATCH 3/3] Update pandas/core/arrays/arrow/array.py

---
 pandas/core/arrays/arrow/array.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/arrays/arrow/array.py b/pandas/core/arrays/arrow/array.py
index 3cf33ccba2b1b..891b25f47000d 100644
--- a/pandas/core/arrays/arrow/array.py
+++ b/pandas/core/arrays/arrow/array.py
@@ -1025,7 +1025,7 @@ def to_numpy(
             mask = ~self.isna()
             result[mask] = np.asarray(self[mask]._data)
         elif pa.types.is_null(self._data.type):
-            result = np.asarray(self._pa_array, dtype=dtype)
+            result = np.asarray(self._data, dtype=dtype)
             if not isna(na_value):
                 result[:] = na_value
             return result