ENH: Implement .dt.year for ArrowExtensionArray (#52330)

Author: mroeschke

pandas/core/arrays/arrow/array.py

@@ -1961,6 +1961,10 @@ def _str_wrap(self, width: int, **kwargs):
             "str.wrap not supported with pd.ArrowDtype(pa.string())."
         )
 
+    @property
+    def _dt_year(self):
+        return type(self)(pc.year(self._pa_array))
+
     @property
     def _dt_day(self):
         return type(self)(pc.day(self._pa_array))

pandas/tests/extension/test_arrow.py

@@ -2110,6 +2110,7 @@ def test_unsupported_dt(data):
 @pytest.mark.parametrize(
     "prop, expected",
     [
+        ["year", 2023],
         ["day", 2],
         ["day_of_week", 0],
         ["dayofweek", 0],