Backport PR #52330 on branch 2.0.x (ENH: Implement .dt.year for ArrowExtensionArray) (#52359)

* Backport PR #52330: ENH: Implement .dt.year for ArrowExtensionArray

* Update array.py

---------

Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Co-authored-by: Patrick Hoefler <61934744+phofl@users.noreply.github.com>

Author: 3 people

pandas/core/arrays/arrow/array.py

@@ -1945,6 +1945,10 @@ def _str_wrap(self, width, **kwargs):
             "str.wrap not supported with pd.ArrowDtype(pa.string())."
         )
 
+    @property
+    def _dt_year(self):
+        return type(self)(pc.year(self._data))
+
     @property
     def _dt_day(self):
         return type(self)(pc.day(self._data))

pandas/tests/extension/test_arrow.py

@@ -2109,6 +2109,7 @@ def test_unsupported_dt(data):
 @pytest.mark.parametrize(
     "prop, expected",
     [
+        ["year", 2023],
         ["day", 2],
         ["day_of_week", 0],
         ["dayofweek", 0],