[pkg/ottl] unexpected behavior of flatten function for slices containing nested objects

[bacherfl]

Component(s)

No response

What happened?

Component(s)

pkg/ottl

What happened?

Description

Currently, the flatten function seems to not flatten the attributes of nested objects within a slice, but rather leaves the objects within the slice unchanged.

Steps to Reproduce

Consider the following input for the flatten function:

{
  "things": [
    {
       "name": "a"
    }
  ]
}

And use the flatten function:

flatten(attributes)

Expected Result

The result should be fully flattened:

{
  "things.0.name": "a"
}

Actual Result

The index of the individual objects within the slice is put into the attribute keys (which is expected), however the flattening is not applied to the nested objects:

{
  "things.0": {
    "name": "a"
  }
}

Collector version

v0.112.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

No response

Collector version

v0.112.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

No response

[github-actions]

Pinging code owners for pkg/ottl: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley. See Adding Labels via Comments if you do not have permissions to add labels yourself.