Unstable integration test alter_pk.test

[JaySon-Huang]

Bug Report

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1. Minimal reproduce step (Required)

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

3. What did you see instead (Required)

https://ci.pingcap.net/blue/organizations/jenkins/tiflash-ghpr-integration-tests/detail/tiflash-ghpr-integration-tests/16305/pipeline/103/

[2024-04-09T07:08:15.819Z] fullstack-test2/ddl/alter_pk.test: Running
[2024-04-09T07:08:24.856Z]   File: fullstack-test2/ddl/alter_pk.test
[2024-04-09T07:08:24.856Z]   Error line: 35
[2024-04-09T07:08:24.856Z]   Error: DBGInvoke query_mapped('desc \$d.\$t', test, t)
[2024-04-09T07:08:24.856Z]   Result:
[2024-04-09T07:08:24.856Z]     ┌─name────────┬─type────────────┬─default_type─┬─default_expression─┐
[2024-04-09T07:08:24.856Z]     │ a           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ b           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ c           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ d           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ e           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ f           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ _tidb_rowid │ Int64           │              │                    │
[2024-04-09T07:08:24.856Z]     └─────────────┴─────────────────┴──────────────┴────────────────────┘
[2024-04-09T07:08:24.856Z]   Expected:
[2024-04-09T07:08:24.856Z]     ┌─name────────┬─type────────────┬─default_type─┬─default_expression─┐
[2024-04-09T07:08:24.856Z]     │ a           │ Int32           │              │                    │
[2024-04-09T07:08:24.856Z]     │ b           │ Int32           │              │                    │
[2024-04-09T07:08:24.856Z]     │ c           │ Int32           │              │                    │
[2024-04-09T07:08:24.856Z]     │ d           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ e           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ f           │ Nullable(Int32) │              │                    │
[2024-04-09T07:08:24.856Z]     │ _tidb_rowid │ Int64           │              │                    │
[2024-04-09T07:08:24.856Z]     └─────────────┴─────────────────┴──────────────┴────────────────────┘

4. What is your TiFlash version? (Required)

master