Error Code: 1241. Operand should contain 1 column(s)

drop procedure if exists usp_add_actors;
delimiter $$
create procedure usp_add_actors(in jsonText json)
begin
    insert into actor(first_name, last_name)
    select firstNameArr, lastNameArr
        from json_table (jsonText, '$.actors[*]'
                columns(
                    firstNameArr varchar(50) path '$.first_name',
                    lastNameArr varchar(50) path '$.last_name')
                ) actorsArray
    left outer join actor on first_name = firstNameArr and
                             last_name = lastNameArr
    where (firstNameArr, lastNameArr) is null
    union
    select firstNameArr, lastNameArr
        from json_table(jsonText, '$'
            columns (
                firstNameArr varchar(50) path '$.actor.first_name',
                lastNameArr varchar(50) path '$.actor.last_name'
                )
            ) actorObj
    left outer join actor on first_name = lastNameArr and
                             last_name = lastNameArr
    where (lastNameArr, lastNameArr) is null;
end$$
delimiter ;

JSON:

{
  "actors": [
    {
      "first_name": "John",
      "last_name": "Doe"
    },
    {
      "first_name": "Johnny",
      "last_name": "Depp"
    },
    {
      "first_name": "Al",
      "last_name": "Pacino"
    },
    {
      "first_name": "Angelina",
      "last_name": "Jolie"
    }
  ],
  "actor": {
    "first_name": "Chenning",
    "last_name": "Tatuum"
  }
}

Как это пофиксить?