From e003b80a8185ad7bceb8824a05fe8db803472922 Mon Sep 17 00:00:00 2001
From: Yuanhao Geng <41546976+GYHHAHA@users.noreply.github.com>
Date: Thu, 14 Jul 2022 22:39:35 -0500
Subject: [PATCH 1/3] Update test_function.py

---
 pandas/tests/groupby/test_function.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pandas/tests/groupby/test_function.py b/pandas/tests/groupby/test_function.py
index 7d6c5310942e2..b8905286b449c 100644
--- a/pandas/tests/groupby/test_function.py
+++ b/pandas/tests/groupby/test_function.py
@@ -1505,3 +1505,15 @@ def test_groupby_empty_dataset(dtype, kwargs):
     expected = df.groupby("A").B.describe(**kwargs).reset_index(drop=True).iloc[:0]
     expected.index = Index([])
     tm.assert_frame_equal(result, expected)
+
+
+def test_corrwith_with_1_axis():
+    # GH 47723
+    df = DataFrame({"a": [1, 1, 2], "b": [3, 7, 4]})
+    result = df.groupby("a").corrwith(df, axis=1)
+    index = pd.Index(
+        data=[(1, 0), (1, 1), (1, 2), (2, 2), (2, 0), (2, 1)],
+        name=("a", None),
+    )
+    expected = Series([np.nan] * 6, index=index)
+    tm.assert_series_equal(result, expected)

From a45a3afd9643784f582189f3ea82f7a92f9f6f70 Mon Sep 17 00:00:00 2001
From: Yuanhao Geng <41546976+GYHHAHA@users.noreply.github.com>
Date: Thu, 14 Jul 2022 22:40:33 -0500
Subject: [PATCH 2/3] Update groupby.py

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

diff --git a/pandas/core/groupby/groupby.py b/pandas/core/groupby/groupby.py
index 89e47af4cb614..b44db88723742 100644
--- a/pandas/core/groupby/groupby.py
+++ b/pandas/core/groupby/groupby.py
@@ -1024,7 +1024,7 @@ def curried(x):
                 curried, self._obj_with_exclusions, is_transform=is_transform
             )
 
-            if self._selected_obj.ndim != 1 and self.axis != 1:
+            if self._selected_obj.ndim != 1 and self.axis != 1 and result.ndim != 1:
                 missing = self._obj_with_exclusions.columns.difference(result.columns)
                 if len(missing) > 0:
                     warn_dropping_nuisance_columns_deprecated(

From 9c4aaa5e92b84ac3b8c07304419bd2b921423c64 Mon Sep 17 00:00:00 2001
From: Yuanhao Geng <41546976+GYHHAHA@users.noreply.github.com>
Date: Thu, 14 Jul 2022 22:51:17 -0500
Subject: [PATCH 3/3] fix flake

---
 pandas/tests/groupby/test_function.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/tests/groupby/test_function.py b/pandas/tests/groupby/test_function.py
index b8905286b449c..de2ff20ff3a96 100644
--- a/pandas/tests/groupby/test_function.py
+++ b/pandas/tests/groupby/test_function.py
@@ -1511,7 +1511,7 @@ def test_corrwith_with_1_axis():
     # GH 47723
     df = DataFrame({"a": [1, 1, 2], "b": [3, 7, 4]})
     result = df.groupby("a").corrwith(df, axis=1)
-    index = pd.Index(
+    index = Index(
         data=[(1, 0), (1, 1), (1, 2), (2, 2), (2, 0), (2, 1)],
         name=("a", None),
     )