server: fix decode issue for prefetch point plan index keys

[tangenta]

What problem does this PR solve?

Issue Number: close #50012

Problem Summary:

The second parameter of tablecodec.DecodeHandleInUniqueIndexValue indicates whether index KVs belong to a clustered-index table. Previously, it was always false, causing decoding error and panic.

What changed and how does it work?

• Set the parameter properly.
• In order to pass the check like BatchGet req does not set the resource tag, tid: 123, stack: goroutine 20153 [running], I also set the resource group tagger by the digest of all SQLs.
• Add an integration test.

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

[tiprow]

Hi @tangenta. Thanks for your PR.

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[codecov]

Codecov Report

Merging #50037 (f7cce54) into master (33480e8) will decrease coverage by 3.1350%.
Report is 12 commits behind head on master.
The diff coverage is 8.6956%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50037        +/-   ##
================================================
- Coverage   71.9599%   68.8249%   -3.1350%     
================================================
  Files          1438       1440         +2     
  Lines        345794     409173     +63379     
================================================
+ Hits         248833     281613     +32780     
- Misses        76727     108521     +31794     
+ Partials      20234      19039      -1195     

Flag	Coverage Δ
integration	43.8584% <8.6956%> (?)
unit	71.9596% <ø> (-0.0003%)	⬇️

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

Components	Coverage Δ
dumpling	56.3129% <ø> (ø)
parser	∅ <ø> (∅)
br	44.1286% <ø> (-7.4728%)	⬇️

[crazycs520]

@mornyx PTAL

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-03 10:08:15.768616363 +0000 UTC m=+2251586.805843287: ☑️ agreed by lance6716.
• 2024-01-03 12:21:13.086277546 +0000 UTC m=+2259564.123504471: ☑️ agreed by Defined2014.

[Defined2014]

/hold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crazycs520, Defined2014, lance6716

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• OWNERS [Defined2014,crazycs520,lance6716]

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[tangenta]

/unhold cc @Defined2014

[tangenta]

/unhold

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #50046.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #50047.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #50048.