array(4) {
  [0]=>
  array(1) {
    ["operation"]=>
    string(6) "insert"
  }
  [1]=>
  NULL
  [2]=>
  NULL
  [3]=>
  array(1) {
    ["operation"]=>
    string(6) "update"
  }
}
array(3) {
  [0]=>
  NULL
  [1]=>
  NULL
  [2]=>
  array(1) {
    ["operation"]=>
    string(6) "delete"
  }
}