Specs

select_object_meta(String.t(), String.t(), String.t() | map(), keyword()) ::
  {:error, error()} | {:ok, Aliyun.Oss.Client.Response.t()}

CreateSelectObjectMeta API用于获取目标文件总的行数，总的列数（对于CSV文件），以及Splits个数。如果该信息不存在，则会扫描整个文件，分析并记录下CSV文件的上述信息。重复调用该API则会保存上述信息而不必重新扫描整个文件。

Options

• :format - 用于设置请求语法：:json or :csv, 默认为:csv

Examples

iex> select_request = %{
  "JsonMetaRequest" => %{
    "InputSerialization" => %{"JSON" => %{"Type" => "LINES"}},
    "OverwriteIfExisting" => "false"
  }
}
iex> Aliyun.Oss.Object.select_object_meta("some-bucket", "some-object", select_request, format: :json)
{:ok, %Aliyun.Oss.Client.Response{
    data: <<208, 207, 17, 224, 161, 177, 26, 225, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 62, 0, 3, 0, 254, 255, 9, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18,
      0, 0, 0, ...>>,
    headers: [
      {"Date", "Wed, 05 Dec 2018 02:34:57 GMT"},
      ...
    ]
  }
}
iex> select_request = ~S[
  <?xml version="1.0"?>
  <JsonMetaRequest>
      <InputSerialization>
          <JSON>
              <Type>LINES</Type>
          </JSON>
      </InputSerialization>
      <OverwriteIfExisting>false</OverwriteIfExisting>
  </JsonMetaRequest>
]
iex> Aliyun.Oss.Object.select_object_meta("some-bucket", "some-object", select_request, format: :json)
{:ok, %Aliyun.Oss.Client.Response{
    data: <<208, 207, 17, 224, 161, 177, 26, 225, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 62, 0, 3, 0, 254, 255, 9, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18,
      0, 0, 0, ...>>,
    headers: [
      {"Date", "Wed, 05 Dec 2018 02:34:57 GMT"},
      ...
    ]
  }
}