*: set default shard_row_id_bits and pre_split_regions for all tables

[jackysp]

What problem does this PR solve?

Issue Number: close #55716

Problem Summary:

What changed and how does it work?

Check List

Tests

• [x] 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.

Introduced variables `tidb_shard_row_id_bits` and `tidb_pre_split_regions`, to change the default values of `shard_row_id_bits` and `pre_split_regions`, avoiding setting them individually for each table.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.3319%. Comparing base (499e45f) to head (04127e4). Report is 52 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #55717         +/-   ##
=================================================
- Coverage   72.8489%   58.3319%   -14.5171%     
=================================================
  Files          1604       1756        +152     
  Lines        445733     643839     +198106     
=================================================
+ Hits         324712     375564      +50852     
- Misses       101000     243773     +142773     
- Partials      20021      24502       +4481     

Flag	Coverage Δ
integration	41.3738% <53.1250%> (?)
unit	73.6243% <93.7500%> (+1.6630%)	:arrow_up:

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	64.3915% <ø> (+18.6506%)	:arrow_up:

[jackysp]

/test check-dev

[tiprow[bot]]

@jackysp: The specified target(s) for /test were not found. The following commands are available to trigger required jobs:

• /test fast_test_tiprow
• /test tidb_parser_test

Use /test all to run all jobs.

In response to this:

/test check-dev

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[jackysp]

/retest-required

[D3Hunter]

/hold

new feature need confirm from PM

[Frank945946]

The default values are the same as in prior versions, and it supports setting the values at the session level. LGTM.

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-09-04 03:22:47.210870662 +0000 UTC m=+414691.728923572: :ballot_box_with_check: agreed by tangenta.
• 2024-09-05 01:14:33.066485455 +0000 UTC m=+493397.584538380: :ballot_box_with_check: agreed by Benjamin2037.

[Benjamin2037]

/hold

[Benjamin2037]

@jackysp I just hold this pr and let PM Frank help open an FD for this issue，sync with you！

[ti-chi-bot[bot]]

@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[Benjamin2037]

/retest

[ti-chi-bot[bot]]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[jackysp]

@yudongusa PTAL, thanks!

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, Frank945946, tangenta, yudongusa

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ~~OWNERS~~ [Benjamin2037,tangenta]
• ~~pkg/ddl/OWNERS~~ [Benjamin2037,tangenta]
• ~~pkg/sessionctx/variable/OWNERS~~ [yudongusa]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[jackysp]

/unhold