yangyichao-mango opened a new pull request #3439:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3439
## What is the purpose of the pull request
*Introduce data analysis service interface for clear code*
## Brief change log
- *Change DataAnalysisService class to interface*
- *Add DataAnalysisServiceImpl class for DataAnalysisService interface*
- *Format the code style*
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