private static async Task DoBulkInsertIntoTempTableAsync([NotNull] DemoDbContext ctx, [NotNull] List <Guid> customerIds)
{
var tempTableQuery = await ctx.BulkInsertValuesIntoTempTableAsync(customerIds);
var customers = await ctx.Customers.Join(tempTableQuery, c => c.Id, t => t.Column1, (c, t) => c).ToListAsync();
Console.WriteLine($"Found customers: {String.Join(", ", customers.Select(c => c.Id))}");
}