[CHORE] connect: df.schema (#3353)

tests/connect/test_schema.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from pyspark.sql.types import LongType, StructField, StructType
+
+
+def test_schema(spark_session):
+    # Create DataFrame from range(10)
+    df = spark_session.range(10)
+
+    # Define the expected schema
+    # in reality should be nullable=False, but daft has all our structs as nullable=True
+    expected_schema = StructType([StructField("id", LongType(), nullable=True)])
+
+    # Verify the schema is as expected
+    assert df.schema == expected_schema, "Schema should match the expected schema"