Add test for compliant Parquet

Author: judahrand

pandas/tests/io/test_parquet.py

@@ -17,6 +17,7 @@
 from pandas.compat.pyarrow import (
     pa_version_under1p0,
     pa_version_under2p0,
+    pa_version_under4p0,
     pa_version_under5p0,
 )
 import pandas.util._test_decorators as td
@@ -931,6 +932,20 @@ def test_read_parquet_manager(self, pa, using_array_manager):
         else:
             assert isinstance(result._mgr, pd.core.internals.BlockManager)
 
+    @td.skip_if_no("pyarrow", min_version="4.0.0")
+    def test_list_column_results_in_compliant_parquet(self, pa):
+        # https://github.com/pandas-dev/pandas/issues/26551
+        df = pd.DataFrame({"a": [[1], [2]]})
+
+        with tm.ensure_clean() as path:
+            df.to_parquet(path, pa)
+            result = pyarrow.parquet.read_table(path)
+
+        assert (
+            str(result.schema.get_field_by_name("a").type)
+            == "list<element: list<element: int64>>"
+        )
+
 
 class TestParquetFastParquet(Base):
     def test_basic(self, fp, df_full):