public UnionSelectQuery(
Func <NpgsqlConnection> getConnection)
{
_getConnection = getConnection ?? throw new ArgumentNullException(nameof(getConnection));
if (!SupportedTypes.IsSupported <TResult>())
{
throw new ArgumentException($"The type '{typeof(TResult).Name}' cannot be used as the result of a Union query.", nameof(TResult));
}
}