feat: add T-SQL parser to monorepo

[h3n4l]

Summary

Add ANTLR4-based T-SQL (Transact-SQL) parser from the tsql-parser repository into the parser monorepo.

Changes

• Add tsql parser directory with complete parser implementation

  • Grammar files: TSqlLexer.g4, TSqlParser.g4
  • Helper files: keyword_map.go, tsql_base_lexer.go, generate_keyword_golang_map.py
  • Makefile with build and test targets (follows existing pattern)
  • README documentation

• Test coverage: 143 SQL test examples covering:

  • DDL statements (CREATE, ALTER, DROP for databases, tables, views, indexes, procedures, functions, etc.)
  • DML statements (SELECT, INSERT, UPDATE, DELETE, MERGE)
  • T-SQL specific features:
    • Stored procedures and functions
    • Control flow (IF, WHILE, TRY/CATCH, etc.)
    • Built-in functions (date, string, math, cryptographic, JSON, XML, etc.)
    • DBCC commands
    • Query hints and table hints
    • Transactions and locks
    • Triggers and cursors
    • Security features (logins, roles, permissions, encryption)
    • High availability features (Always On, mirroring, etc.)
    • Extended events and auditing

• Package updates:

  • Updated package name: github.com/bytebase/parser/tsql
  • Fixed import paths in test files
  • Generated Go parser files using ANTLR 4
  • Updated helper files to use tsql package

• CI/CD integration:

  • Added tsql to the parser list in .github/workflows/tests.yml
  • Tests will run automatically on changes to tsql/ directory

Test Results

All test cases pass successfully:

PASS: TestTSQLParser

Migration Notes

This moves the parser from the standalone tsql-parser repository into the unified parser monorepo alongside PostgreSQL, Redshift, CQL, and Snowflake parsers.

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