MaxCompute V2.0 allows you to use external tables to access Object Storage Service (OSS) and Tablestore. MaxCompute Studio provides code templates to help you query unstructured data. This topic describes how to use MaxCompute Studio to query unstructured data.
Prerequisites
- A MaxCompute project is connected. For more information, see Manage project connections.
- A MaxCompute Java module is created. For more information, see Create a MaxCompute Java module.
Write a StorageHandler, Extractor, or Outputer program
Debug the Extractor or Outputer program
Write your test cases to debug your Extractor or Outputer program based on the unit
test examples in the examples directory. 

Package and upload the program
After you debug the program, compress the program into a JAR package and upload the package to the MaxCompute server as a resource. For more information, see Package, upload, and register.