Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This is an automated cherry-pick of #2650
What problem does this PR solve?
close #2649
What is changed and how it works?
The behavior of other version/client
TiSpark lacks the necessary information to judge if it can pass unique. So we just delete it.
Lack unique in indexscan only slows the performance but does not influence the correct. See the pr's comment for more details pingcap/tidb#29650