trying_to_concatenate_hostvars.txt

# hostvars where each host includes its private ip
  "_meta": {
    "hostvars": {
      "node2.amazonaws.com": {
        "private_ip": "10.1.0.77"
      },
      "node1.amazonaws.com": {
        "private_ip": "10.1.0.64"
      }
    }
  }

# Task trying to create 10.1.0.77;10.1.0.64
- name: Create concatenated string of private ips
  set_fact:
    my_joined_list: "{{ hostvars[item]['private_ip'] | join(';') }}"
  with_items: "{{ play_hosts }}"

# instead it creates this garbage
TASK [debug] ***********
ok: [node1.amazonaws.com] => {
    "my_joined_list": "1;0;.;1;.;0;.;6;4"
}
ok: [node2.amazonaws.com] => {
    "my_joined_list": "1;0;.;1;.;0;.;6;4"
}