udf编写

打包之后，注册报错：IoTDB> CREATE FUNCTION example1 AS 'org.example.Main'
Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 301: [TSStatus(code:1202, message:Failed to register UDF EXAMPLE1(org.example.Main), because its instance can not be constructed successfully. Exception: java.lang.ClassNotFoundException: com.example.GenericCsvExporter)]
IoTDB>

Start by reproducing the CREATE FUNCTION example1 registration after packaging, using org.example.Main and the reported missing class com.example.GenericCsvExporter as the entry points. Inspect how the packaged UDF resolves its classes; done means registration succeeds without the ClassNotFoundException.

Written by the indexing model from the issue text.