EMsnap opened a new pull request, #4176:
URL: https://github.com/apache/incubator-inlong/pull/4176
### Title Name: [INLONG-4169][Sort] Add comments before classes in sort
Fixes #4169
### Motivation
currently there are many classes in sort that don't have enough comment
### Modifications
Add comments before classes in sort
### Documentation
- Does this pull request introduce a new feature? (no)
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