*: [DNM] read billing demo calibration surfaces

[winoros]

What problem does this PR solve?

Issue Number: ref #0

Problem Summary:

DNM/build-only PR for triggering CI on the read billing demo calibration-surface branch.

What changed and how does it work?

This branch prototypes the read billing demo RU model and adds statement-summary-associated calibration surfaces for workload testing:

• EXPLAIN ANALYZE FORMAT='RU' read billing preview and accounting model.
• Statement summary read-billing base-unit/status query surfaces for workload calibration.
• Dimension-preserving base units so testers can adjust weights after a workload run without rerunning the workload.
• Queryable status rows for unsupported, unknown-input, error, and overflow accounting cases.

This PR is DNM and is intended to trigger build/test coverage only.

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.

Manual test:

make bazel_prepare
make lint
git diff --check

Targeted tests were run locally for planner, executor, statement summary v1/v2, and read-billing aggregation/status paths.

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]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ti-chi-bot]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign terry1purcell, tiancaiamao, yibin87 for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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Details

Needs approval from an approver in each of these files:

• OWNERS
• pkg/infoschema/OWNERS
• pkg/metrics/OWNERS
• pkg/planner/OWNERS
• pkg/sessionctx/vardef/OWNERS
• pkg/sessionctx/variable/OWNERS

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