curl --request GET \
  --url https://api.example.com/api/playground/sessions/{session_id}/distributions \
  --header 'Authorization: Bearer <token>'

{
  "session_id": "<string>",
  "distributions": [
    {
      "column": "<string>",
      "distribution": {},
      "null_count": 123,
      "total_count": 123
    }
  ]
}