[SOLVED] Does JMESPath support something like a spread operator?

Does JMESPath support something like a spread operator?

Is it possible to convert this JSON:

{ "message": "Hello!", "contextMap": { "foo": 1, "bar": 2, ...otherInContextMap }, ...someOther }

(where keys of contextMap are not known) into the following JSON:


{ "message": "Hello!", "foo": 1, "bar": 2, ...otherInContextMap  }

using JMESPath?

(Context: I want to scrape Java logs with contextMap using Promtail and store message together with members of contextMap to Loki.)

EDIT: I need to explicitly pick message and members of contextMap. (There are some other unknown/dynamic members ...someOther in JSON.)

Solution

You can merge a basic query selecting the content of contextMap along with a multiselect hash for the message.

So, given the query:

merge({message: message}, contextMap)

On your given input, it would yield the expected:

{
  "message": "Hello!",
  "foo": 1,
  "bar": 2
}