From 522ffa86897e374f085a37edceb544446508b459 Mon Sep 17 00:00:00 2001
From: zhangxiaoxing <58493968+zhangxiaoxing@users.noreply.github.com>
Date: Sat, 13 Nov 2021 11:21:06 +0800
Subject: [PATCH 1/4] BUG GH44079 fix

---
 pandas/io/parsers/base_parser.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/io/parsers/base_parser.py b/pandas/io/parsers/base_parser.py
index 339585810bec1..f5baf8f0ffa39 100644
--- a/pandas/io/parsers/base_parser.py
+++ b/pandas/io/parsers/base_parser.py
@@ -698,7 +698,7 @@ def _infer_types(self, values, na_values, try_num_bool=True):
             # error: Argument 2 to "isin" has incompatible type "List[Any]"; expected
             # "Union[Union[ExtensionArray, ndarray], Index, Series]"
             mask = algorithms.isin(values, list(na_values))  # type: ignore[arg-type]
-            na_count = mask.sum()
+            na_count = mask.astype('uint8').sum()
             if na_count > 0:
                 if is_integer_dtype(values):
                     values = values.astype(np.float64)

From eb8d28b6120512c1d5d04ef8f751886acaf71465 Mon Sep 17 00:00:00 2001
From: zhangxiaoxing <58493968+zhangxiaoxing@users.noreply.github.com>
Date: Sat, 13 Nov 2021 11:48:12 +0800
Subject: [PATCH 2/4] BUG GH44079 pre-commit checked

---
 pandas/io/parsers/base_parser.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/io/parsers/base_parser.py b/pandas/io/parsers/base_parser.py
index f5baf8f0ffa39..b514b3855e42f 100644
--- a/pandas/io/parsers/base_parser.py
+++ b/pandas/io/parsers/base_parser.py
@@ -698,7 +698,7 @@ def _infer_types(self, values, na_values, try_num_bool=True):
             # error: Argument 2 to "isin" has incompatible type "List[Any]"; expected
             # "Union[Union[ExtensionArray, ndarray], Index, Series]"
             mask = algorithms.isin(values, list(na_values))  # type: ignore[arg-type]
-            na_count = mask.astype('uint8').sum()
+            na_count = mask.astype("uint8").sum()
             if na_count > 0:
                 if is_integer_dtype(values):
                     values = values.astype(np.float64)

From 908389aa19653daa07f7dbe592de21ea41c688f0 Mon Sep 17 00:00:00 2001
From: zhangxiaoxing <58493968+zhangxiaoxing@users.noreply.github.com>
Date: Sun, 14 Nov 2021 11:54:42 +0800
Subject: [PATCH 3/4] BUG GH44079 added test

---
 pandas/tests/io/parser/test_index_col.py | 28 ++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/pandas/tests/io/parser/test_index_col.py b/pandas/tests/io/parser/test_index_col.py
index 646cb2029919d..ba32196b961d6 100644
--- a/pandas/tests/io/parser/test_index_col.py
+++ b/pandas/tests/io/parser/test_index_col.py
@@ -89,6 +89,13 @@ def test_infer_index_col(all_parsers):
         columns=["A", "B", "C"],
     )
     tm.assert_frame_equal(result, expected)
+    expected.index = expected.index.astype("object")
+    expected.index = expected.index.astype("object")
+    expected.index = expected.index.astype("object")
+    expected.index = expected.index.astype("object")
+    expected.index = expected.index.astype("object")
+    expected.index = expected.index.astype("object")
+    expected.index = expected.index.astype("object")
 
 
 @skip_pyarrow
@@ -297,3 +304,24 @@ def test_multiindex_columns_index_col_with_data(all_parsers):
         index=Index(["data"]),
     )
     tm.assert_frame_equal(result, expected)
+
+
+@skip_pyarrow
+def test_infer_types_boolean_sum(all_parsers):
+    # GH#44079
+    parser = all_parsers
+    result = parser.read_csv(
+        StringIO("0,1"),
+        names=["a", "b"],
+        index_col=["a"],
+        dtype={"a": "UInt8"},
+    )
+    expected = DataFrame(
+        data={
+            "a": [
+                0,
+            ],
+            "b": [1],
+        }
+    ).set_index("a")
+    tm.assert_frame_equal(result, expected, check_index_type=False)

From fa430543dc37ee80ef8210d4a5c671c06f40674b Mon Sep 17 00:00:00 2001
From: zhangxiaoxing <58493968+zhangxiaoxing@users.noreply.github.com>
Date: Sun, 14 Nov 2021 12:03:49 +0800
Subject: [PATCH 4/4] BUG GH44079 typofix

---
 pandas/tests/io/parser/test_index_col.py | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/pandas/tests/io/parser/test_index_col.py b/pandas/tests/io/parser/test_index_col.py
index ba32196b961d6..26e3e9c182b42 100644
--- a/pandas/tests/io/parser/test_index_col.py
+++ b/pandas/tests/io/parser/test_index_col.py
@@ -89,13 +89,6 @@ def test_infer_index_col(all_parsers):
         columns=["A", "B", "C"],
     )
     tm.assert_frame_equal(result, expected)
-    expected.index = expected.index.astype("object")
-    expected.index = expected.index.astype("object")
-    expected.index = expected.index.astype("object")
-    expected.index = expected.index.astype("object")
-    expected.index = expected.index.astype("object")
-    expected.index = expected.index.astype("object")
-    expected.index = expected.index.astype("object")
 
 
 @skip_pyarrow