If your data stored in Tablestore is uniquely structured and you want to define development logic to process each row of data, such as parsing a specific JSON string, you can use User Defined Function (UDF).

Procedure

  1. Install the MaxCompute-Java/MaxCompute-Studio plug-in in IntelliJ. For more information, see What is Studio. After the plug-in is installed, you can start development.

    The following figure shows a simple UDF definition, which connects two strings. MaxCompute supports more complex UDF, such as user-defined window execution logic. For more information, see Develop and debug UDF.

  2. Install the MaxCompute-Java/MaxCompute-Studio plug-in in IntelliJ. For more information, see What is Studio. After the plug-in is installed, you can start development.

    The following figure shows a simple UDF definition, which connects two strings. MaxCompute supports more complex UDF, such as user-defined window execution logic. For more information, see Develop and debug UDF.

  3. Upload the package to MaxCompute after the resource is packaged.

    Choose File > Project Structure > Artifacts. Enter the name and output directory. Then, click the + icon to select the output module. After the resource is packaged, use MaxCompute Project Explorer to upload the resource and create a function. Then, you can call the function in SQL.

  4. Run bin/odpscmd.bat. 
    // Select a row of data and pass in name/name to the UDF. A connection of the two strings is returned.
select cloud_metric_extract_md5(name, name) as udf_test from test_table limit 1;

    A similar output is returned.