Fixes missing child column name in dtype while reading ORC file.

python/cudf/cudf/_lib/io/utils.pyx

@@ -138,14 +138,6 @@ cdef Column update_column_struct_field_names(
 ):
     cdef vector[string] field_names
 
-    if is_struct_dtype(col):
-        field_names.reserve(len(col.base_children))
-        for i in range(info.children.size()):
-            field_names.push_back(info.children[i].name)
-        col = col._rename_fields(
-            field_names
-        )
-
     if col.children:
         children = list(col.children)
         for i, child in enumerate(children):
@@ -154,4 +146,13 @@ cdef Column update_column_struct_field_names(
                 info.children[i]
             )
         col.set_base_children(tuple(children))
+
+    if is_struct_dtype(col):
+        field_names.reserve(len(col.base_children))
+        for i in range(info.children.size()):
+            field_names.push_back(info.children[i].name)
+        col = col._rename_fields(
+            field_names
+        )
+
     return col

python/cudf/cudf/tests/test_orc.py

@@ -1185,7 +1185,21 @@ def test_writer_timestamp_stream_size(datadir, tmpdir):
 def test_no_row_group_index_orc_read(datadir, fname):
     fpath = datadir / fname
 
-    got = pa.orc.ORCFile(fpath).read()
-    expect = cudf.read_orc(fpath)
+    expect = pa.orc.ORCFile(fpath).read()
+    got = cudf.read_orc(fpath)
 
-    assert got.equals(expect.to_arrow())
+    assert expect.equals(got.to_arrow())
+
+
+def test_names_in_struct_dtype_nesting(datadir):
+    fname = datadir / "TestOrcFile.NestedStructDataFrame.orc"
+
+    expect = pa.orc.ORCFile(fname).read()
+    got = cudf.read_orc(fname)
+
+    # test dataframes
+    assert expect.equals(got.to_arrow())
+
+    edf = cudf.DataFrame(expect.to_pandas())
+    # test schema
+    assert edf.dtypes.equals(got.dtypes)