如何使用 'modify-overwrite-beta' 在 jolt 中执行除法运算

How to perform divide operation in jolt using 'modify-overwrite-beta'

输入,

 {"scores": [  4,2,8,7,5  ] }

输出,

 {"FirstElement": 2 } //This is generated by dividing the first element of the array by 2.

规格,

 [{
 "operation": "modify-overwrite-beta",
 "spec": {
    "Avg": "=divide(=firstElement(@(1,scores)),2)"
  }
}]

根据上面的规范,我试图将列表的第一个元素除以 2,但我得到的输出与输入相同。

不能用修改嵌套 "functions"。必须把它分成两步。

[
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "firstElement": "=firstElement(@(1,scores))"
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "Avg": "=divide(@(1,firstElement),2)"
    }
  }
]