Feature request: add support for multiple child fields

[tulzke]

Problem

At the moment, if you try to filter by 2 fields, the utility treats these as indexes.

Example

Json

{
  "star": {
    "name": "Sun",
    "diameter": 1391016,
    "age": null,
    "planets": [
        {
          "name": "Mercury",
          "Number of Moons": "0",
          "diameter": 4879,
          "has-moons": false
        },
        {
          "name": "Venus",
          "Number of Moons": "0",
          "diameter": 12104,
          "has-moons": false
        },
        {
          "name": "Earth",
          "Number of Moons": "1",
          "diameter": 12756,
          "has-moons": true
        },
        {
          "name": "Mars",
          "Number of Moons": "2",
          "diameter": 6792,
          "has-moons": true
        }
      ]
  }
}

json path expression:

"$.star.planets.*["name","diameter"]"

What i expected:

[
  "Mercury",
  4879,
  "Venus",
  12104,
  "Earth",
  12756,
  "Mars",
  6792
]

What i actually got:

$ cat solar.json | jp -p '$.star.planets.*["name","diameter"]' 
error executing query: invalid path: invalid index: "name"

[davidhoo]

Thank you for your feedback. At present, jp does not yet support listing multiple keys like "name","diameter" in one go, which is why you see the invalid index: "name" error. Multi-field extraction will be supported in a future release.

[davidhoo]

问题已解决！我们已经实现了对多字段子节点查询的支持。现在可以使用表达式如 '$.star.planets.*["name","diameter"]' 来同时获取多个字段的值。感谢您的反馈！

[tulzke]

Thanks for the quick response to the issue.