Unexpected full reload using info schema cache v2

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Set DefTiDBSchemaCacheSize to 10 to enable info schema cache.
Run test TestModifyColumnBetweenStringTypes and check log

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

Only some full load in log.

3. What did you see instead (Required)

1034 times `full load`

4. What is your TiDB version? (Required)

master

[tiancaiamao]

1034 times full load? which version are you using?

I test with latest master and see only 6 times:

commit b7e32bcf9994f0fc916c59e6d5f573a39127d105 (HEAD -> master, origin/master, origin/HEAD)
Author: Yuanjia Zhang <zhangyuanjia@pingcap.com>
Date:   Mon May 20 17:47:46 2024 +0800

    planner: fix the wrong result caused by `year_col cmp out-of-range-uint` (#53395)
    
    close pingcap/tidb#50235

go test -tags intest -run  TestModifyColumnBetweenStringTypes > a.log
grep 'full load' a.log 
[2024/05/20 21:18:17.236 +08:00] [INFO] [domain.go:322] ["full load InfoSchema success"] [currentSchemaVersion=0] [neededSchemaVersion=0] ["start time"=8.288048ms]
[2024/05/20 21:18:17.238 +08:00] [INFO] [domain.go:642] ["full load and reset schema validator"]
[2024/05/20 21:18:17.255 +08:00] [INFO] [domain.go:322] ["full load InfoSchema success"] [currentSchemaVersion=0] [neededSchemaVersion=1] ["start time"=8.667917ms]
[2024/05/20 21:18:17.256 +08:00] [INFO] [domain.go:642] ["full load and reset schema validator"]
[2024/05/20 21:18:17.966 +08:00] [INFO] [domain.go:322] ["full load InfoSchema success"] [currentSchemaVersion=0] [neededSchemaVersion=51] ["start time"=14.079266ms]
[2024/05/20 21:18:17.972 +08:00] [INFO] [domain.go:642] ["full load and reset schema validator"]

[wjhuang2016]

It's caused by unexpected code introduced in my test branch, and this problem doesn't exist in the master branch,