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sysbench update index performance degradation by commit e8c32a #41300

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Description

@dbsid

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

compare the sysbench oltp_update_index on commit e8fb81b4fb316723251e2c41dd52f8795a with baseline.

2. What did you expect to see? (Required)

no performance degradation

3. What did you see instead (Required)

before
img_v2_02e792f2-b08e-430a-af62-f65200e65a9g

after
img_v2_93b9ba44-df77-4759-bb96-55c9c325edeg

4. What is your TiDB version? (Required)

v6.6

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