sql: fix the correctness problem about kill (#6377)

[ti-chi-bot]

This is an automated cherry-pick of #6377

Signed-off-by: Weizhen Wang wangweizhen@pingcap.com

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What is changed, added or deleted? (Required)

fix the correctness problem about kill

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

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Commit hash: 6edc481