From 3419837246a422b8b1547412edd7cce9575070ac Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Sun, 16 Jun 2024 18:27:35 -0700
Subject: [PATCH 1/4] Use more default_index for empty cases

---
 pandas/core/frame.py                        | 2 +-
 pandas/core/generic.py                      | 3 +--
 pandas/core/groupby/groupby.py              | 5 ++---
 pandas/core/groupby/grouper.py              | 3 ++-
 pandas/core/indexes/api.py                  | 2 +-
 pandas/core/internals/managers.py           | 2 +-
 pandas/core/methods/selectn.py              | 7 +++++--
 pandas/core/reshape/reshape.py              | 4 ++--
 pandas/tests/frame/methods/test_quantile.py | 9 +++++++++
 9 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index a6c0e1e372530..0aeda77233125 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -13078,7 +13078,7 @@ def quantile(
 
         if len(data.columns) == 0:
             # GH#23925 _get_numeric_data may have dropped all columns
-            cols = Index([], name=self.columns.name)
+            cols = self.columns[:0]
 
             dtype = np.float64
             if axis == 1:
diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 599b3d5578fca..93068c665a880 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -158,7 +158,6 @@
     Index,
     MultiIndex,
     PeriodIndex,
-    RangeIndex,
     default_index,
     ensure_index,
 )
@@ -1852,7 +1851,7 @@ def _drop_labels_or_levels(self, keys, axis: AxisInt = 0):
                 else:
                     # Drop the last level of Index by replacing with
                     # a RangeIndex
-                    dropped.columns = RangeIndex(dropped.columns.size)
+                    dropped.columns = default_index(dropped.columns.size)
 
             # Handle dropping index labels
             if labels_to_drop:
diff --git a/pandas/core/groupby/groupby.py b/pandas/core/groupby/groupby.py
index 1b58317c08736..4327d31ca6903 100644
--- a/pandas/core/groupby/groupby.py
+++ b/pandas/core/groupby/groupby.py
@@ -128,7 +128,6 @@ class providing the base-class of operations.
 from pandas.core.indexes.api import (
     Index,
     MultiIndex,
-    RangeIndex,
     default_index,
 )
 from pandas.core.internals.blocks import ensure_block_shape
@@ -1264,7 +1263,7 @@ def _set_result_index_ordered(
         if self._grouper.has_dropped_na:
             # Add back in any missing rows due to dropna - index here is integral
             # with values referring to the row of the input so can use RangeIndex
-            result = result.reindex(RangeIndex(len(index)), axis=0)
+            result = result.reindex(default_index(len(index)), axis=0)
         result = result.set_axis(index, axis=0)
 
         return result
@@ -1334,7 +1333,7 @@ def _wrap_aggregated_output(
             #   enforced in __init__
             result = self._insert_inaxis_grouper(result, qs=qs)
             result = result._consolidate()
-            result.index = RangeIndex(len(result))
+            result.index = default_index(len(result))
 
         else:
             index = self._grouper.result_index
diff --git a/pandas/core/groupby/grouper.py b/pandas/core/groupby/grouper.py
index e75a5b9089f5f..5f680de77649f 100644
--- a/pandas/core/groupby/grouper.py
+++ b/pandas/core/groupby/grouper.py
@@ -34,6 +34,7 @@
 from pandas.core.indexes.api import (
     Index,
     MultiIndex,
+    default_index,
 )
 from pandas.core.series import Series
 
@@ -901,7 +902,7 @@ def is_in_obj(gpr) -> bool:
     if len(groupings) == 0 and len(obj):
         raise ValueError("No group keys passed!")
     if len(groupings) == 0:
-        groupings.append(Grouping(Index([], dtype="int"), np.array([], dtype=np.intp)))
+        groupings.append(Grouping(default_index(0), np.array([], dtype=np.intp)))
 
     # create the internals grouper
     grouper = ops.BaseGrouper(group_axis, groupings, sort=sort, dropna=dropna)
diff --git a/pandas/core/indexes/api.py b/pandas/core/indexes/api.py
index 83e8df5072b92..628790dbd8c6d 100644
--- a/pandas/core/indexes/api.py
+++ b/pandas/core/indexes/api.py
@@ -130,7 +130,7 @@ def _get_combined_index(
     # TODO: handle index names!
     indexes = _get_distinct_objs(indexes)
     if len(indexes) == 0:
-        index = Index([])
+        index = default_index(0)
     elif len(indexes) == 1:
         index = indexes[0]
     elif intersect:
diff --git a/pandas/core/internals/managers.py b/pandas/core/internals/managers.py
index 64109f5c1655c..79cba9275a119 100644
--- a/pandas/core/internals/managers.py
+++ b/pandas/core/internals/managers.py
@@ -249,7 +249,7 @@ def blklocs(self) -> npt.NDArray[np.intp]:
     def make_empty(self, axes=None) -> Self:
         """return an empty BlockManager with the items axis of len 0"""
         if axes is None:
-            axes = [Index([])] + self.axes[1:]
+            axes = [default_index(0)] + self.axes[1:]
 
         # preserve dtype if possible
         if self.ndim == 1:
diff --git a/pandas/core/methods/selectn.py b/pandas/core/methods/selectn.py
index 283acaca2c117..4cde038cfa052 100644
--- a/pandas/core/methods/selectn.py
+++ b/pandas/core/methods/selectn.py
@@ -199,7 +199,10 @@ def __init__(self, obj: DataFrame, n: int, keep: str, columns: IndexLabel) -> No
         self.columns = columns
 
     def compute(self, method: str) -> DataFrame:
-        from pandas.core.api import Index
+        from pandas.core.api import (
+            Index,
+            default_index,
+        )
 
         n = self.n
         frame = self.obj
@@ -227,7 +230,7 @@ def get_indexer(current_indexer: Index, other_indexer: Index) -> Index:
         original_index = frame.index
         cur_frame = frame = frame.reset_index(drop=True)
         cur_n = n
-        indexer = Index([], dtype=np.int64)
+        indexer = default_index(0)
 
         for i, column in enumerate(columns):
             # For each column we apply method to cur_frame[column].
diff --git a/pandas/core/reshape/reshape.py b/pandas/core/reshape/reshape.py
index a8efae8da82c8..664ac57fcc823 100644
--- a/pandas/core/reshape/reshape.py
+++ b/pandas/core/reshape/reshape.py
@@ -42,7 +42,7 @@
 from pandas.core.indexes.api import (
     Index,
     MultiIndex,
-    RangeIndex,
+    default_index,
 )
 from pandas.core.reshape.concat import concat
 from pandas.core.series import Series
@@ -1047,7 +1047,7 @@ def stack_reshape(
             if data.ndim == 1:
                 data.name = 0
             else:
-                data.columns = RangeIndex(len(data.columns))
+                data.columns = default_index(len(data.columns))
         buf.append(data)
 
     if len(buf) > 0 and not frame.empty:
diff --git a/pandas/tests/frame/methods/test_quantile.py b/pandas/tests/frame/methods/test_quantile.py
index 32ae4c0ff2f50..4a9fce665a319 100644
--- a/pandas/tests/frame/methods/test_quantile.py
+++ b/pandas/tests/frame/methods/test_quantile.py
@@ -926,3 +926,12 @@ def test_datelike_numeric_only(self, expected_data, expected_index, axis):
             expected_data, name=0.5, index=Index(expected_index), dtype=np.float64
         )
         tm.assert_series_equal(result, expected)
+
+
+def test_multi_quantile_numeric_only_retains_columns():
+    df = DataFrame(list("abc"))
+    result = df.quantile([0.5, 0.7], numeric_only=True)
+    expected = DataFrame(index=[0.5, 0.7])
+    tm.assert_frame_equal(
+        result, expected, check_index_type=True, check_column_type=True
+    )

From eff7c466af5c4ff464e8f1d6edc99367b83ec7a3 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 17 Jun 2024 11:25:16 -0700
Subject: [PATCH 2/4] fix tests

---
 doc/source/whatsnew/v3.0.0.rst                       | 2 +-
 pandas/core/methods/selectn.py                       | 8 +++-----
 pandas/tests/frame/methods/test_quantile.py          | 4 ++--
 pandas/tests/generic/test_generic.py                 | 8 ++++++--
 pandas/tests/indexes/test_base.py                    | 2 +-
 pandas/tests/series/methods/test_get_numeric_data.py | 5 ++---
 6 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/doc/source/whatsnew/v3.0.0.rst b/doc/source/whatsnew/v3.0.0.rst
index 80e5e89b79690..cf9543ee7e465 100644
--- a/doc/source/whatsnew/v3.0.0.rst
+++ b/doc/source/whatsnew/v3.0.0.rst
@@ -504,7 +504,7 @@ Timezones
 Numeric
 ^^^^^^^
 - Bug in ``np.matmul`` with :class:`Index` inputs raising a ``TypeError`` (:issue:`57079`)
--
+- Bug in :meth:`DataFrame.quantile` where the column type was not preserved when ``numeric_only=True`` with a list-like ``q`` produced an empty result (:issue:`?``)
 
 Conversion
 ^^^^^^^^^^
diff --git a/pandas/core/methods/selectn.py b/pandas/core/methods/selectn.py
index 4cde038cfa052..c766e84286afa 100644
--- a/pandas/core/methods/selectn.py
+++ b/pandas/core/methods/selectn.py
@@ -29,6 +29,8 @@
 )
 from pandas.core.dtypes.dtypes import BaseMaskedDtype
 
+from pandas.core.indexes.api import default_index
+
 if TYPE_CHECKING:
     from pandas._typing import (
         DtypeObj,
@@ -38,6 +40,7 @@
 
     from pandas import (
         DataFrame,
+        Index,
         Series,
     )
 else:
@@ -199,11 +202,6 @@ def __init__(self, obj: DataFrame, n: int, keep: str, columns: IndexLabel) -> No
         self.columns = columns
 
     def compute(self, method: str) -> DataFrame:
-        from pandas.core.api import (
-            Index,
-            default_index,
-        )
-
         n = self.n
         frame = self.obj
         columns = self.columns
diff --git a/pandas/tests/frame/methods/test_quantile.py b/pandas/tests/frame/methods/test_quantile.py
index 4a9fce665a319..f35b77da0b547 100644
--- a/pandas/tests/frame/methods/test_quantile.py
+++ b/pandas/tests/frame/methods/test_quantile.py
@@ -710,14 +710,14 @@ def test_quantile_empty_no_columns(self, interp_method):
         result = df.quantile(
             0.5, numeric_only=True, interpolation=interpolation, method=method
         )
-        expected = Series([], index=[], name=0.5, dtype=np.float64)
+        expected = Series([], name=0.5, dtype=np.float64)
         expected.index.name = "captain tightpants"
         tm.assert_series_equal(result, expected)
 
         result = df.quantile(
             [0.5], numeric_only=True, interpolation=interpolation, method=method
         )
-        expected = DataFrame([], index=[0.5], columns=[])
+        expected = DataFrame([], index=[0.5])
         expected.columns.name = "captain tightpants"
         tm.assert_frame_equal(result, expected)
 
diff --git a/pandas/tests/generic/test_generic.py b/pandas/tests/generic/test_generic.py
index 0b607d91baf65..b591b1b1092d4 100644
--- a/pandas/tests/generic/test_generic.py
+++ b/pandas/tests/generic/test_generic.py
@@ -93,8 +93,7 @@ def test_get_numeric_data(self, frame_or_series):
         if isinstance(o, DataFrame):
             # preserve columns dtype
             expected.columns = o.columns[:0]
-        # https://github.com/pandas-dev/pandas/issues/50862
-        tm.assert_equal(result.reset_index(drop=True), expected)
+        tm.assert_equal(result, expected)
 
         # get the bool data
         arr = np.array([True, True, False, True])
@@ -102,6 +101,11 @@ def test_get_numeric_data(self, frame_or_series):
         result = o._get_numeric_data()
         tm.assert_equal(result, o)
 
+    def test_get_bool_data_empty_preserve_index(self):
+        expected = Series([], dtype="bool")
+        result = expected._get_bool_data()
+        tm.assert_series_equal(result, expected, check_index_type=True)
+
     def test_nonzero(self, frame_or_series):
         # GH 4633
         # look at the boolean/nonzero behavior for objects
diff --git a/pandas/tests/indexes/test_base.py b/pandas/tests/indexes/test_base.py
index e701a49ea93ad..16908fbb4fecc 100644
--- a/pandas/tests/indexes/test_base.py
+++ b/pandas/tests/indexes/test_base.py
@@ -1558,7 +1558,7 @@ def test_ensure_index_uint64(self):
 
     def test_get_combined_index(self):
         result = _get_combined_index([])
-        expected = Index([])
+        expected = RangeIndex(0)
         tm.assert_index_equal(result, expected)
 
 
diff --git a/pandas/tests/series/methods/test_get_numeric_data.py b/pandas/tests/series/methods/test_get_numeric_data.py
index f25583904377a..4a11d7905f506 100644
--- a/pandas/tests/series/methods/test_get_numeric_data.py
+++ b/pandas/tests/series/methods/test_get_numeric_data.py
@@ -1,5 +1,4 @@
 from pandas import (
-    Index,
     Series,
     date_range,
 )
@@ -19,7 +18,7 @@ def test_get_numeric_data_preserve_dtype(self):
 
         obj = Series([1, "2", 3.0])
         result = obj._get_numeric_data()
-        expected = Series([], dtype=object, index=Index([], dtype=object))
+        expected = Series([], dtype=object)
         tm.assert_series_equal(result, expected)
 
         obj = Series([True, False, True])
@@ -28,5 +27,5 @@ def test_get_numeric_data_preserve_dtype(self):
 
         obj = Series(date_range("20130101", periods=3))
         result = obj._get_numeric_data()
-        expected = Series([], dtype="M8[ns]", index=Index([], dtype=object))
+        expected = Series([], dtype="M8[ns]")
         tm.assert_series_equal(result, expected)

From 9fc6589a98cfe785794cd6592539f7e2a03e9a1d Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 17 Jun 2024 11:28:49 -0700
Subject: [PATCH 3/4] Update number

---
 doc/source/whatsnew/v3.0.0.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/whatsnew/v3.0.0.rst b/doc/source/whatsnew/v3.0.0.rst
index cf9543ee7e465..eb6679eb61dbd 100644
--- a/doc/source/whatsnew/v3.0.0.rst
+++ b/doc/source/whatsnew/v3.0.0.rst
@@ -503,8 +503,8 @@ Timezones
 
 Numeric
 ^^^^^^^
+- Bug in :meth:`DataFrame.quantile` where the column type was not preserved when ``numeric_only=True`` with a list-like ``q`` produced an empty result (:issue:`59035`)
 - Bug in ``np.matmul`` with :class:`Index` inputs raising a ``TypeError`` (:issue:`57079`)
-- Bug in :meth:`DataFrame.quantile` where the column type was not preserved when ``numeric_only=True`` with a list-like ``q`` produced an empty result (:issue:`?``)
 
 Conversion
 ^^^^^^^^^^

From 7319e6a690bfb0e12fd05af930107dabb28663cd Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 17 Jun 2024 12:15:02 -0700
Subject: [PATCH 4/4] Address typing

---
 pandas/core/indexes/api.py     | 2 +-
 pandas/core/methods/selectn.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/pandas/core/indexes/api.py b/pandas/core/indexes/api.py
index 628790dbd8c6d..5144e647e73b4 100644
--- a/pandas/core/indexes/api.py
+++ b/pandas/core/indexes/api.py
@@ -130,7 +130,7 @@ def _get_combined_index(
     # TODO: handle index names!
     indexes = _get_distinct_objs(indexes)
     if len(indexes) == 0:
-        index = default_index(0)
+        index: Index = default_index(0)
     elif len(indexes) == 1:
         index = indexes[0]
     elif intersect:
diff --git a/pandas/core/methods/selectn.py b/pandas/core/methods/selectn.py
index c766e84286afa..02e7445f1d275 100644
--- a/pandas/core/methods/selectn.py
+++ b/pandas/core/methods/selectn.py
@@ -228,7 +228,7 @@ def get_indexer(current_indexer: Index, other_indexer: Index) -> Index:
         original_index = frame.index
         cur_frame = frame = frame.reset_index(drop=True)
         cur_n = n
-        indexer = default_index(0)
+        indexer: Index = default_index(0)
 
         for i, column in enumerate(columns):
             # For each column we apply method to cur_frame[column].