为什么第二个墓碑包含“ marked_deleted”属性，而第一个删除却不包含？

Question

我正在阅读http://www.beyondthelines.net/databases/cassandra-tombstones/，其中

apdu-processor

产生突变

INSERT INTO movements (
  id,
  address, 
  item_id, 
  quantity,
  username
) VALUES (
  103,
  'D3-DJ-21-B-02', 
  '3600029145',
  2,
  null
);

和

[
  {
    "partition" : {
      "key" : [ "103" ],
      "position" : 0
    },
    "rows" : [
      {
        "type" : "row",
        "position" : 18,
        "liveness_info" : { "tstamp" : "2017-01-27T15:09:50.065224Z" },
        "cells" : [
          { "name" : "address", "value" : "D3-DJ-21-B-02" },
          { "name" : "item_d", "value" : "3600029145" },
          { "name" : "quantity", "value" : "2" },
          { "name" : "username", "deletion_info" : { "local_delete_time" : "2017-01-27T15:09:50Z" }
        ]
      }
    ]
  }
]

产生突变

INSERT INTO locations (
  address,
  status,
  properties
) VALUES (
  'D3-DJ-21-B-02',
  'damaged',
  null
);

为什么第二个突变的墓碑包含[ { "partition" : { "key" : [ "D3-DJ-21-B-02" ], "position" : 0 }, "rows" : [ { "type" : "row", "position" : 18, "liveness_info" : { "tstamp" : "2017-01-28T11:58:59.160898Z" }, "cells" : [ { "name" : "status", "value" : "damaged" }, { "name" : "properties", "deletion_info" : { "marked_deleted" : "2017-01-28T11:58:59.160897Z", "local_delete_time" : "2017-01-28T11:58:59Z" } } ] } ] } ] 属性，而第一个删除的墓碑没有？