import pyarrow as pa
import lancedb
import tempfile

# Define schema with nullable struct field
my_struct = pa.struct([pa.field("x", pa.float32())])
schema = pa.schema([
    pa.field("id", pa.string()),
    pa.field("data", my_struct).with_nullable(True)  # This is nullable
])

print(f"Field 'data' is nullable: {schema.field('data').nullable}")

with tempfile.TemporaryDirectory() as tmpdir:
    db = lancedb.connect(f"{tmpdir}/test.lancedb")
    table = db.create_table("test", schema=schema)
    
    # This works fine
    print("✓ Inserting record with struct data...")
    table.add([{"id": "1", "data": {"x": 1.0}}])
    
    # This should work (field is nullable) but fails
    print("✗ Inserting record with None data (should work but fails)...")
    table.add([{"id": "2", "data": None}])

"""
STACK TRACE:
File "lancedb/table.py", line 323, in _align_field_types
    field.type.fields,
AttributeError: 'pyarrow.lib.DataType' object has no attribute 'fields'
"""