tipb: add scalar protocol for Local MATCH AGAINST in Boolean mode

[solotzg]

Summary

• Add the LocalMatchAgainstBoolean scalar signature with ID 5250.
• Add the Boolean query payload and analyzer settings used by the release-8.5 TiDB/TiFlash row-wise Local MATCH path.
• Keep this release-specific protocol aligned with TiDB and TiFlash feature/release-8.5-fts; master PR tipb: reserve Local MATCH scalar signature #431 separately reserves the scalar signature ID.

Validation

• GOWORK=off GOCACHE=/private/tmp/tipb-go-cache go test ./go-tipb — passed (package compiles; no test files).
• Tipb PR CI — Go, C++, and Rust generation checks passed; CLA passed.
• In TiFlash, regenerated Tipb C++ protocol sources and compiled the Local MATCH implementation and gtest source objects. The full gtest executable was not linked/run.

Summary by CodeRabbit

• New Features
  • Added a query format for Boolean full-text search, supporting required, optional, and excluded terms, plus phrase and prefix terms.
  • Query metadata now includes parser, tokenization, stopword, and collation settings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 483eb13b-d3ac-49a6-8ad4-185bb5722e9a

📥 Commits

Reviewing files that changed from the base of the PR and between abb1604 and 288bce9.

⛔ Files ignored due to path filters: 1

• go-tipb/expression.pb.go is excluded by !**/*.pb.go

📒 Files selected for processing: 1

• proto/expression.proto

🚧 Files skipped from review as they are similar to previous changes: 1

• proto/expression.proto

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📝 Walkthrough

The protobuf schema adds the LocalMatchAgainstBoolean scalar function signature and defines query nodes, clause metadata, parser options, stopword settings, and versioned wire semantics.

Changes: Local MATCH Boolean schema

Layer / File(s)	Summary
Define the query contract proto/expression.proto	Adds scalar function ID 5250 and enums and messages for Boolean clauses, parser settings, token limits, stopword handling, collation, and wire version.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Suggested reviewers: ailinkid

Merge Risk: ⚪ Minimal · up to 288bc

This PR adds a new scalar function signature and the Local MATCH Boolean query schema. It is additive and no concrete merge-blocking risk was found.

### Architecture Summary

Architecture risk: 🔵 Low · up to abb16

The change affects 1 system.

Changed systems: proto

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — proto (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in proto/expression.proto: ScalarFuncSig adds the LocalMatchAgainstBoolean value with numeric ID 5250.
• observed — Modified behavior in proto/expression.proto: Adds the Local MATCH Boolean query wire schema: enums define occurrence, term, parser, and stopword modes; the query message carries nodes and analyzer, stopword, collation, and version settings; each node carries occurrence, term type, and text. The versioning comments specify rejection of unknown versions and identify the built-in stopword set as part of the versioned semantics.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title is concise, uses the repository module prefix, and clearly identifies the new scalar protocol for Local MATCH AGAINST Boolean mode.
Description check		The description clearly explains the protocol additions, release-specific alignment, and validation results. It does not use the repository template headings and omits explicit problem, related-change…

✨ Finishing Touches: 💡 1

🛠️ Fix failing CI checks: 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Create a new PR

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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_{A rabbit reads the query nodes,
And hops through clauses, words, and codes.
A parser sorts each token right,
While stopwords rest outside the light.
The schema keeps its version clear,
Then bounds away with carrots near.}

_{Comment @coderabbitai help to get the list of available commands.}

[AilinKid]

rest LGTM