infoschema_v2: fix TestPartitionAddIndexGC

[GMHDBJD]

What problem does this PR solve?

Issue Number: ref #50959

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

diff --git a/pkg/sessionctx/variable/tidb_vars.go b/pkg/sessionctx/variable/tidb_vars.go
index d5e9b34324..73e6f48387 100644
--- a/pkg/sessionctx/variable/tidb_vars.go
+++ b/pkg/sessionctx/variable/tidb_vars.go
@@ -1483,7 +1483,7 @@ const (
        DefTiDBSchemaVersionCacheLimit                    = 16
        DefTiDBIdleTransactionTimeout                     = 0
        DefTiDBTxnEntrySizeLimit                          = 0
-       DefTiDBSchemaCacheSize                            = 0
+       DefTiDBSchemaCacheSize                            = 1024
        DefTiDBLowResolutionTSOUpdateInterval             = 2000

make ut X='run pkg/ddl/test/fail/ddl_test TestPartitionAddIndexGC'

• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

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[codecov]

Codecov Report

Merging #52163 (bf3bfb9) into master (dde0a54) will decrease coverage by 16.8805%.
Report is 42 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #52163         +/-   ##
=================================================
- Coverage   70.7222%   53.8417%   -16.8805%     
=================================================
  Files          1489       1679        +190     
  Lines        439999     636333     +196334     
=================================================
+ Hits         311177     342613      +31436     
- Misses       109329     269956     +160627     
- Partials      19493      23764       +4271     

Flag	Coverage Δ
integration	36.6650% <0.0000%> (?)
unit	70.4524% <100.0000%> (-0.0874%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	50.5182% <ø> (+4.6663%)	⬆️

[zimulala]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ywqzzy, zimulala

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• pkg/infoschema/OWNERS [ywqzzy,zimulala]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-28 02:31:06.766692619 +0000 UTC m=+2121493.788939001: ☑️ agreed by ywqzzy.
• 2024-04-02 02:24:42.828505027 +0000 UTC m=+324344.356045568: ☑️ agreed by zimulala.