The `COERCIBILITY` of variables are different from MySQL
Open
severity/minor
sig/sql-infra
type/bug
- Dominant language
- Go
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
Run `SELECT COERCIBILITY(@@character_set_server)`
### 2. What did you expect to see? (Required)
MySQL gives `3`.
### 3. What did you see instead (Required)
TiDB gives `4`
### 4. What is your TiDB version? (Required)
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Assessment
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