014-code opened a new pull request, #38835:
URL: https://github.com/apache/shardingsphere/pull/38835
### What changed
- Skip MySQL system variable validation for user variables such as
`@test_var`.
- Add a unit test to verify `SET @test_var = 1` is recorded as a replayable
session variable.
### Why
MySQL user variables are valid session-scoped variables, but ShardingSphere
Proxy validated every non-global SET variable through the MySQL system variable
registry. This caused `SET @test_var = 1` to fail with `Unknown system variable
'@test_var'`.
### Verification
- Manually verified through ShardingSphere Proxy with MySQL protocol:
- `SET @test_var = 1;` executes successfully.
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