From 60339ffa8a79893c199a203621221c4650daaddb Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 10 Jun 2024 10:52:35 -0700
Subject: [PATCH 1/3] Use reshape instead of flatten

---
 pandas/core/arrays/arrow/array.py | 2 +-
 pandas/core/generic.py            | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/pandas/core/arrays/arrow/array.py b/pandas/core/arrays/arrow/array.py
index 3d55513ab914c..d073cf0b11c6b 100644
--- a/pandas/core/arrays/arrow/array.py
+++ b/pandas/core/arrays/arrow/array.py
@@ -2970,7 +2970,7 @@ def transpose_homogeneous_pyarrow(
     """
     arrays = list(arrays)
     nrows, ncols = len(arrays[0]), len(arrays)
-    indices = np.arange(nrows * ncols).reshape(ncols, nrows).T.flatten()
+    indices = np.arange(nrows * ncols).reshape(ncols, nrows).T.reshape(-1)
     arr = pa.chunked_array([chunk for arr in arrays for chunk in arr._pa_array.chunks])
     arr = arr.take(indices)
     return [ArrowExtensionArray(arr.slice(i * ncols, ncols)) for i in range(nrows)]
diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 84745b25b5eef..599b3d5578fca 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -9271,7 +9271,9 @@ def compare(
 
         # reorder axis to keep things organized
         indices = (
-            np.arange(diff.shape[axis]).reshape([2, diff.shape[axis] // 2]).T.flatten()
+            np.arange(diff.shape[axis])
+            .reshape([2, diff.shape[axis] // 2])
+            .T.reshape(-1)
         )
         diff = diff.take(indices, axis=axis)
 

From 17511d133dc325d5bff0432785559817a618011e Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 10 Jun 2024 11:03:29 -0700
Subject: [PATCH 2/3] Use reshape instead of ravel'

---
 pandas/core/indexing.py        | 4 ++--
 pandas/core/reshape/reshape.py | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/pandas/core/indexing.py b/pandas/core/indexing.py
index 9140b1dbe9b33..43fc6e0b12ef9 100644
--- a/pandas/core/indexing.py
+++ b/pandas/core/indexing.py
@@ -2352,7 +2352,7 @@ def _align_series(
             def ravel(i):
                 return i.ravel() if isinstance(i, np.ndarray) else i
 
-            indexer = tuple(map(ravel, indexer))
+            indexer = map(ravel, indexer)
 
             aligners = [not com.is_null_slice(idx) for idx in indexer]
             sum_aligners = sum(aligners)
@@ -2440,7 +2440,7 @@ def _align_frame(self, indexer, df: DataFrame) -> DataFrame:
                 ax = self.obj.axes[i]
                 if is_sequence(ix) or isinstance(ix, slice):
                     if isinstance(ix, np.ndarray):
-                        ix = ix.ravel()
+                        ix = ix.reshape(-1)
                     if idx is None:
                         idx = ax[ix]
                     elif cols is None:
diff --git a/pandas/core/reshape/reshape.py b/pandas/core/reshape/reshape.py
index 5426c72a356d6..a8efae8da82c8 100644
--- a/pandas/core/reshape/reshape.py
+++ b/pandas/core/reshape/reshape.py
@@ -842,7 +842,7 @@ def _convert_level_number(level_num: int, columns: Index):
                     [x._values.astype(dtype, copy=False) for _, x in subset.items()]
                 )
                 N, K = subset.shape
-                idx = np.arange(N * K).reshape(K, N).T.ravel()
+                idx = np.arange(N * K).reshape(K, N).T.reshape(-1)
                 value_slice = value_slice.take(idx)
             else:
                 value_slice = subset.values
@@ -924,7 +924,7 @@ def _reorder_for_extension_array_stack(
     # idx is an indexer like
     # [c0r0, c1r0, c2r0, ...,
     #  c0r1, c1r1, c2r1, ...]
-    idx = np.arange(n_rows * n_columns).reshape(n_columns, n_rows).T.ravel()
+    idx = np.arange(n_rows * n_columns).reshape(n_columns, n_rows).T.reshape(-1)
     return arr.take(idx)
 
 

From bf889875a6934668759615acf66228708b8dc99c Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 10 Jun 2024 18:22:11 -0700
Subject: [PATCH 3/3] add back tuple

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

diff --git a/pandas/core/indexing.py b/pandas/core/indexing.py
index 43fc6e0b12ef9..8d1239ff71174 100644
--- a/pandas/core/indexing.py
+++ b/pandas/core/indexing.py
@@ -2352,7 +2352,7 @@ def _align_series(
             def ravel(i):
                 return i.ravel() if isinstance(i, np.ndarray) else i
 
-            indexer = map(ravel, indexer)
+            indexer = tuple(map(ravel, indexer))
 
             aligners = [not com.is_null_slice(idx) for idx in indexer]
             sum_aligners = sum(aligners)