pkg/ddl, pkg/sessionctx: pass fulltext sysvars to TiCI

[wjhuang2016]

What problem does this PR solve?

Issue Number: ref #xxx

Problem Summary:

• Support FULLTEXT INDEX creation system variables: innodb_ft_max_token_size, innodb_ft_min_token_size, ngram_token_size, innodb_ft_enable_stopword, innodb_ft_server_stopword_table, innodb_ft_user_stopword_table.
• Read stopwords from the configured stopword table and pass them to TiCI at index creation time.

What changed and how does it work?

• Add the above sysvars with validation and cluster persistence.
• Capture sysvar values into the FULLTEXT index DDL job, so each new FULLTEXT index creation uses a stable snapshot of the sysvars (existing indexes are not affected).
• Extend TiDB internal TiCI proto (pkg/tici/tici.proto) to carry CreateIndexRequest.parser_info and ParserInfo.stop_words.
• During FULLTEXT index creation, TiDB builds parser_info.parser_params from job sysvars and (for standard parser + stopwords enabled + stopword table configured) reads stopwords from the table (single VARCHAR column value) and sends the de-duplicated list via parser_info.stop_words.

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.

Add FULLTEXT INDEX DDL system variables and pass tokenizer/stopword config to TiCI during index creation.

[codecov]

Codecov Report

❌ Patch coverage is 51.27610% with 210 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.3861%. Comparing base (2d2bd57) to head (515400e).
⚠️ Report is 48 commits behind head on feature/fts.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           feature/fts     #65967        +/-   ##
===================================================
+ Coverage      72.3094%   72.3861%   +0.0767%     
===================================================
  Files             1895       1919        +24     
  Lines           533272     534938      +1666     
===================================================
+ Hits            385606     387221      +1615     
+ Misses          123717     123515       -202     
- Partials         23949      24202       +253     

Flag	Coverage Δ
integration	46.1972% <1.1600%> (-0.0820%)	⬇️
unit	69.9475% <51.2761%> (+0.0635%)	⬆️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	63.2926% <ø> (+0.2539%)	⬆️

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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 benjamin2037, yudongusa for approval. For more information see the Code Review Process.
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Details

Needs approval from an approver in each of these files:

• OWNERS
• pkg/ddl/OWNERS
• pkg/sessionctx/vardef/OWNERS
• pkg/sessionctx/variable/OWNERS

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[wjhuang2016]

/retest

[ti-chi-bot]

@wjhuang2016: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/mysql-test	515400e	link	true	/test mysql-test
pull-integration-tici-test	515400e	link	false	/test pull-integration-tici-test

Full PR test history. Your PR dashboard.

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