From c1eacf0be4f6bcfdb7ac42a826965a313c86d87a Mon Sep 17 00:00:00 2001
From: coastalwhite <me@gburghoorn.com>
Date: Fri, 9 Aug 2024 14:12:36 +0200
Subject: [PATCH] add test

---
 py-polars/tests/unit/io/test_parquet.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/py-polars/tests/unit/io/test_parquet.py b/py-polars/tests/unit/io/test_parquet.py
index 18f15bfd40c0c..643564d6a77b4 100644
--- a/py-polars/tests/unit/io/test_parquet.py
+++ b/py-polars/tests/unit/io/test_parquet.py
@@ -1400,3 +1400,14 @@ def test_write_sliced_lists_18069() -> None:
     after = pl.read_parquet(f)
 
     assert_frame_equal(before, after)
+
+
+def test_null_array_dict_pages_18085() -> None:
+    test = pd.DataFrame(
+        [{"A": np.NaN, "B": 3, "C": None}, {"A": float("NaN"), "B": None, "C": None}]
+    )
+
+    f = io.BytesIO()
+    test.to_parquet(f)
+    f.seek(0)
+    pl.read_parquet(f)