剩余空间，内部连接和一对多@relation冲突

Question

图片上有我的桌子，我将获得这些模型，但查询时会遇到麻烦。

class PromoWithProducts {
    @Embedded
    lateinit var promo: Promo
    @Embedded
    var promoCustomer: PromoCustomer? = null
    @Relation(parentColumn = "promo_id",
              entityColumn = "promo_condition_promo_id",
              entity = PromoCondition::class)
    lateinit var promoConditions: MutableList<PromoConditionWithProducts>
}


class PromoConditionWithProducts {
     @Embedded
     lateinit var promoCondition: PromoCondition
     @Relation(parentColumn = "promo_condition_product_id",
             entityColumn = "id",
             entity = Product::class)
     lateinit var products: List<ProductWithStatuses>
}

我下面的promosWithConditions查询代码

@Transaction
@Query("""SELECT * FROM Promos AS promo
    INNER JOIN PromoCustomers AS customer ON customer.promo_customer_promo_id = promo.promo_id
    LEFT JOIN PromoConditions as condition ON promo.promo_id = condition.promo_condition_promo_id
    LEFT JOIN Products as product ON product.productId = condition.promo_condition_product_id
    LEFT JOIN ProductStatuses AS status ON status.product_status_product_id = product.productId
    LEFT JOIN Remains AS remain ON remain.remain_product_id = product.productId AND isMain = :isMain
    WHERE level = :levelId
    AND customer.promo_customer_customer_id = :customerId
    AND status.product_status_customer_id = :customerId
    AND priceTypeId = :priceTypeId
    AND contractId IN (:contractIds)
    """)
abstract fun getPromosWithProducts(contractIds: List<Int?>, customerId: Int, priceTypeId: Int, levelId: Int, isMain: Boolean): Single<MutableList<PromoWithProducts>>

但是结果上Promos像promo1，promo1，promo1，promo2，promo2，promo3，promo3等重复出现

任何想法，当涉及多个联接时如何进行查询