chrislu
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ad86637e0b
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feat: Phase 1 - Add SQL query engine foundation for MQ topics
Implements core SQL infrastructure with metadata operations:
New Components:
- SQL parser integration using github.com/xwb1989/sqlparser
- Query engine framework in weed/query/engine/
- Schema catalog mapping MQ topics to SQL tables
- Interactive SQL CLI command 'weed sql'
Supported Operations:
- SHOW DATABASES (lists MQ namespaces)
- SHOW TABLES (lists MQ topics)
- SQL statement parsing and routing
- Error handling and result formatting
Key Design Decisions:
- MQ namespaces ↔ SQL databases
- MQ topics ↔ SQL tables
- Parquet message storage ready for querying
- Backward-compatible schema evolution support
Testing:
- Unit tests for core engine functionality
- Command integration tests
- Parse error handling validation
Assumptions (documented in code):
- All MQ messages stored in Parquet format
- Schema evolution maintains backward compatibility
- MySQL-compatible SQL syntax via sqlparser
- Single-threaded usage per SQL session
Next Phase: DDL operations (CREATE/ALTER/DROP TABLE)
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2025-08-31 20:16:45 -07:00 |
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