fix pg bug

[sjgllgh]

What is the purpose of the change

I found an error in a PostgreSQL SQL statement, so I submitted this pull request to fix the problem.

Brief change log

• Modify LabelManagerMapper.xml to fix pg sql error.

Checklist

• [x] I have read the Contributing Guidelines on pull requests.
• [x] I have explained the need for this PR and the problem it solves
• [x] I have explained the changes or the new features added to this PR
• [x] I have added tests corresponding to this change
• [x] I have updated the documentation to reflect this change
• [x] I have verified that this change is backward compatible (If not, please discuss on the Linkis mailing list first)
• [ ] If this is a code change: I have written unit tests to fully verify the new behavior.