基于一个条件，即如果两个表中的客户名称匹配，则其中一个表中的少数列应分配为**null。我有所有匹配条件的输入，但我无法将所需列设置为null**
输入：

[
  {
    "IN_num": "3",
    "In_Details": "404 error",
    "customer_name": "vivo",
    "customer_location": "hyd",
    "customer_ID": "1003"
  },
  {
    "IN_num": "2",
    "In_Details": "404 error",
    "customer_name": "MI",
    "customer_location": "hyd",
    "customer_ID": "1002"
  },
  {
    "IN_num": "1",
    "In_Details": "notworking",
    "customer_name": "Nokia",
    "customer_location": "Hyd",
    "customer_ID": "1001"
  }
]

字符串
我已经尝试创建一个假的null值，并将其分配给所需的键，但我仍然得到了键已经存在的值。
我的规格：

[
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "N1": [
          "=isNull(@(1,customer_ID))",
          "NuLl"
        ],
        "N2": [
          "=isNull(@(1,customer_location))",
          "NotNuLl"
        ],
        "Condition": "=concat(@(1,N1),'_',@(1,N2))",
        "test": null
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": {
        "IN_num": "[&1].IN_num",
        "In_Details": "[&1].In_Details",
        "customer_name": "[&1].customer_name",
        "test": "[&1].test",
        "customer_location": "[&1].customer_location",
        "Condition": {
          "NuLl_NotNuLl": {
            "@2,test": "customer_location"
          }
        }
      }
    }
  }
]

型
在这里，customer location有一个现有值，但我希望将其打印为“"。
我得到的输出：

[
  {
    "IN_num": "3",
    "In_Details": "404 error",
    "customer_name": "vivo",
    "test": null,
    "customer_location": "hyd"
  },
  {
    "IN_num": "2",
    "In_Details": "404 error",
    "customer_name": "MI",
    "test": null,
    "customer_location": "hyd"
  },
  {
    "IN_num": "1",
    "In_Details": "notworking",
    "customer_name": "Nokia",
    "test": null,
    "customer_location": "Hyd"
  }
]

型
对于关键字““customer_location”，我希望值为“”或null。
如何进行这件事？