Merge fails with different timestamps

[mastor]

Hi, I just noticed a problem with the merging of two series with different timestamps (maybe an issue due to the shards?)

This is the data:

[
  {
    "name": "test_merge_1",
    "columns": ["time", "value"],
    "points": [
      [315532800000, "a value"]
    ]
  },
  {
    "name": "test_merge_2",
    "columns": ["time", "value"],
    "points": [
      [1401321600000, "another value"]
    ]
  }
]

The select:

select * from /test_merge_*/

returns:

[
   {
      "name":"test_merge_2",
      "columns":[
         "time",
         "sequence_number",
         "value"
      ],
      "points":[
         [
            1401321600000,
            10001,
            "another value"
         ]
      ]
   },
   {
      "name":"test_merge_1",
      "columns":[
         "time",
         "sequence_number",
         "value"
      ],
      "points":[
         [
            315532800000,
            10001,
            "a value"
         ]
      ]
   }
]

While the select:

select * from test_merge_1 merge test_merge_2

returns:

[]