tidb session execution time is too long
Open
severity/moderate
sig/execution
type/bug
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Description
## Bug Report
v5.4.2

normal execution time

end of execution connection cannot be closed
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### 1. Minimal reproduce step (Required)
### 2. What did you expect to see? (Required)
### 3. What did you see instead (Required)
### 4. What is your TiDB version? (Required)
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