table: introduce RowIDShardGenerator and ReservedRowIDAlloc to alloc auto row id

[lcwangchao]

What problem does this PR solve?

Issue Number: ref #54397

What changed and how does it work?

This PR introduced two more methods to MutateContext to reduce the usage of GetSessionVars:

• GetRowIDShardGenerator() to return a RowIDShardGenerator to generate shard for auto-random columns.
• GetReservedRowIDAlloc() to return a ReservedRowIDAlloc to reserve row id locally.

This PR does not change any code logic.

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 @lcwangchao. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 96.82540% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.2650%. Comparing base (d67421d) to head (c6dfd4b).
Report is 3 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54789         +/-   ##
=================================================
- Coverage   72.7078%   56.2650%   -16.4429%     
=================================================
  Files          1557       1681        +124     
  Lines        438108     613294     +175186     
=================================================
+ Hits         318539     345070      +26531     
- Misses        99847     244707     +144860     
- Partials      19722      23517       +3795     

Flag	Coverage Δ
integration	37.7644% <92.0634%> (?)
unit	71.7264% <96.8254%> (+0.0082%)	⬆️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	52.5836% <ø> (+6.7649%)	⬆️

[lcwangchao]

This PR removed those lines because all states are moved to SessionVars. And every time the txn active, the inner shardStep and shardRemain will be reset

[lcwangchao]

/retest

[tiprow]

@lcwangchao: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[YangKeao]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-22 08:34:21.694032641 +0000 UTC m=+861283.684974111: ☑️ agreed by YangKeao.
• 2024-07-22 09:01:29.343519625 +0000 UTC m=+862911.334461095: ☑️ agreed by tiancaiamao.

[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: easonn7, tangenta, tiancaiamao, YangKeao

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Needs approval from an approver in each of these files:

• OWNERS [YangKeao,tangenta,tiancaiamao]
• pkg/ddl/OWNERS [tangenta]
• pkg/sessionctx/variable/OWNERS [easonn7]
• pkg/table/OWNERS [tangenta]

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