ddl: do not switch to import mode during adding index

[tangenta]

What problem does this PR solve?

Issue Number: close #48259

Problem Summary:

See #48259 (comment).

What is changed and how it works?

• Do not execute show config in initialization of lightning env.
• Do not switch to import mode for raftkv2.

Check List

Tests

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

[ti-chi-bot]

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[codecov]

Codecov Report

Merging #48083 (2712072) into master (201363d) will increase coverage by 1.7877%.
Report is 8 commits behind head on master.
The diff coverage is 20.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48083        +/-   ##
================================================
+ Coverage   71.3849%   73.1726%   +1.7877%     
================================================
  Files          1402       1425        +23     
  Lines        406919     416650      +9731     
================================================
+ Hits         290479     304874     +14395     
+ Misses        96503      92982      -3521     
+ Partials      19937      18794      -1143     

Flag	Coverage Δ
integration	43.9808% <20.0000%> (?)
unit	71.8445% <20.0000%> (+0.4595%)	⬆️

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

Components	Coverage Δ
dumpling	53.9874% <ø> (ø)
parser	∅ <ø> (∅)
br	48.6080% <ø> (-4.4283%)	⬇️

[GMHDBJD]

LGTM

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, GMHDBJD

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-09 03:42:36.620411833 +0000 UTC m=+3702154.207521977: ☑️ agreed by GMHDBJD.
• 2023-11-09 04:00:44.381634942 +0000 UTC m=+3703241.968745071: ☑️ agreed by Benjamin2037.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #48460.