pingcap
syncer(dm): fix collation compatibility behaviour (#6833)
This is an automated cherry-pick of #6833
Signed-off-by: lance6716 [email protected]
What problem does this PR solve?
Issue Number: close #6832
What is changed and how it works?
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 when use "strict" collation_compatible, DM sometimes generate SQL with duplicated collation
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