From 5001000ca711bf27edb91d278044d15205bdfc4f Mon Sep 17 00:00:00 2001
From: 1932819331hy-debug <1932819331hy@gmail.com>
Date: Fri, 16 Oct 2026 20:24:50 +0900
Subject: [PATCH 1/4] GH-53500: Guard Parquet metadata equality against None

---
 python/pyarrow/_parquet.pyx | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/python/pyarrow/_parquet.pyx b/python/pyarrow/_parquet.pyx
index 2621c3bd6d61..a9b876d58286 100644
--- a/python/pyarrow/_parquet.pyx
+++ b/python/pyarrow/_parquet.pyx
@@ -108,7 +108,7 @@ cdef class Statistics(_Weakrefable):
         except TypeError:
             return NotImplemented
 
-    def equals(self, Statistics other):
+    def equals(self, Statistics other not None):
         """
         Return whether the two column statistics objects are equal.
 
@@ -521,7 +521,7 @@ cdef class ColumnChunkMetaData(_Weakrefable):
         except TypeError:
             return NotImplemented
 
-    def equals(self, ColumnChunkMetaData other):
+    def equals(self, ColumnChunkMetaData other not None):
         """
         Return whether the two column chunk metadata objects are equal.
 
@@ -919,7 +919,7 @@ cdef class RowGroupMetaData(_Weakrefable):
         except TypeError:
             return NotImplemented
 
-    def equals(self, RowGroupMetaData other):
+    def equals(self, RowGroupMetaData other not None):
         """
         Return whether the two row group metadata objects are equal.
 
@@ -1295,7 +1295,7 @@ cdef class ParquetSchema(_Weakrefable):
         except TypeError:
             return NotImplemented
 
-    def equals(self, ParquetSchema other):
+    def equals(self, ParquetSchema other not None):
         """
         Return whether the two schemas are equal.
 
@@ -1350,7 +1350,7 @@ cdef class ColumnSchema(_Weakrefable):
     def __reduce__(self):
         return ColumnSchema, (self.parent, self.index)
 
-    def equals(self, ColumnSchema other):
+    def equals(self, ColumnSchema other not None):
         """
         Return whether the two column schemas are equal.
 

From f915fc36fd0d8c0a598c0d9f80a293153bba6710 Mon Sep 17 00:00:00 2001
From: 1932819331hy-debug <1932819331hy@gmail.com>
Date: Fri, 16 Oct 2026 20:25:52 +0900
Subject: [PATCH 2/4] GH-53500: Cover None comparisons for Parquet metadata

---
 python/pyarrow/tests/parquet/test_metadata.py | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/python/pyarrow/tests/parquet/test_metadata.py b/python/pyarrow/tests/parquet/test_metadata.py
index 9eee70b125e5..17958209a74e 100644
--- a/python/pyarrow/tests/parquet/test_metadata.py
+++ b/python/pyarrow/tests/parquet/test_metadata.py
@@ -893,3 +893,25 @@ def test_geospatial_types(parquet_test_datadir):
     column_schema = metadata.schema.column(1)
     assert column_schema.name == "geography"
     assert column_schema.logical_type.type == "GEOGRAPHY"
+def test_parquet_metadata_equality_with_none():
+    table = pa.table({"a": [1, 2, 3]})
+    with pa.BufferOutputStream() as out:
+        pq.write_table(table, out)
+        buf = out.getvalue()
+    metadata = pq.read_metadata(pa.BufferReader(buf))
+    row_group = metadata.row_group(0)
+    column = row_group.column(0)
+    schema = metadata.schema
+    objects = (
+        metadata,
+        row_group,
+        column,
+        column.statistics,
+        schema,
+        schema.column(0),
+    )
+    none = None
+    for obj in objects:
+        with pytest.raises(TypeError, match="Argument 'other' has incorrect type"):
+            obj.equals(none)
+        assert obj != none

From 5065076ce0a81ba754917317cccce1c7f0d95873 Mon Sep 17 00:00:00 2001
From: 1932819331hy-debug <1932819331hy@gmail.com>
Date: Fri, 16 Oct 2026 20:26:48 +0900
Subject: [PATCH 3/4] GH-53500: Format metadata comparison test

---
 python/pyarrow/tests/parquet/test_metadata.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/python/pyarrow/tests/parquet/test_metadata.py b/python/pyarrow/tests/parquet/test_metadata.py
index 17958209a74e..59e6a5027275 100644
--- a/python/pyarrow/tests/parquet/test_metadata.py
+++ b/python/pyarrow/tests/parquet/test_metadata.py
@@ -893,6 +893,8 @@ def test_geospatial_types(parquet_test_datadir):
     column_schema = metadata.schema.column(1)
     assert column_schema.name == "geography"
     assert column_schema.logical_type.type == "GEOGRAPHY"
+
+
 def test_parquet_metadata_equality_with_none():
     table = pa.table({"a": [1, 2, 3]})
     with pa.BufferOutputStream() as out:

From a9dbede63232ab69e74bdbd926f0233561d2fdda Mon Sep 17 00:00:00 2001
From: 1932819331hy-debug <1932819331hy@gmail.com>
Date: Fri, 16 Oct 2026 20:38:35 +0900
Subject: [PATCH 4/4] GH-53500: Cover equality operators with None

---
 python/pyarrow/tests/parquet/test_metadata.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/pyarrow/tests/parquet/test_metadata.py b/python/pyarrow/tests/parquet/test_metadata.py
index 59e6a5027275..0c3423e513bf 100644
--- a/python/pyarrow/tests/parquet/test_metadata.py
+++ b/python/pyarrow/tests/parquet/test_metadata.py
@@ -916,4 +916,5 @@ def test_parquet_metadata_equality_with_none():
     for obj in objects:
         with pytest.raises(TypeError, match="Argument 'other' has incorrect type"):
             obj.equals(none)
-        assert obj != none
+        assert (obj == none) is False
+        assert (obj != none) is True