examples/datafusion-ffi-example/python/tests/_test_table_provider_factory.py

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from __future__ import annotations

from datafusion import SessionContext
from datafusion_ffi_example import MyTableProviderFactory


def test_table_provider_factory_ffi() -> None:
    ctx = SessionContext()
    table = MyTableProviderFactory()

    ctx.register_table_factory("MY_FORMAT", table)

    # Create a new external table
    ctx.sql("""
        CREATE EXTERNAL TABLE
        foo
        STORED AS my_format
        LOCATION 'unused';
    """).collect()

    # Query the pre-populated table
    result = ctx.sql("SELECT * FROM foo;").collect()
    assert len(result) == 2
    assert result[0].num_columns == 2