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from superset.db_engine_specs.mariadb import MariaDBEngineSpec
from superset.db_engine_specs.mysql import MySQLEngineSpec


def test_mariadb_inherits_from_mysql() -> None:
    assert issubclass(MariaDBEngineSpec, MySQLEngineSpec)


def test_mariadb_inherits_extended_aggregations() -> None:
    """
    MariaDB is a MySQL fork implementing the same aggregate functions, not a
    materially different query engine, so it inherits `_extended_aggregations`
    from `MySQLEngineSpec` unmodified -- see the comment above that dict.
    """
    assert MariaDBEngineSpec.get_extended_aggregation_func("STDDEV_SAMP") is not None
    assert MariaDBEngineSpec.get_extended_aggregation_func("VAR_SAMP") is not None
    # Same as MySQL, MEDIAN is not supported.
    assert MariaDBEngineSpec.get_extended_aggregation_func("MEDIAN") is None