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tracker(dm): fix downstream table structure reports key too long (#6661)
This is an automated cherry-pick of #6661
Signed-off-by: lance6716 [email protected]
What problem does this PR solve?
Issue Number: close #5315
What is changed and how it works?
during the refactor of schema tracker, I found this issue is not hard to fix
Check List
Tests
- Unit test
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note
Fix a problem that DM will report `Specified key was too long` error
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@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
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