Add token, AST, and lexer packages for ClickHouse parser #2
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kyleconroy
commented
Dec 12, 2025
kyleconroy
commented
- token: Define lexical tokens and keywords for ClickHouse SQL
- ast: Define AST node types for statements and expressions
- lexer: Implement tokenizer for ClickHouse SQL syntax
- token: Define lexical tokens and keywords for ClickHouse SQL - ast: Define AST node types for statements and expressions - lexer: Implement tokenizer for ClickHouse SQL syntax
- Implement Parse function taking context and io.Reader - Support SELECT, INSERT, CREATE, DROP, ALTER, TRUNCATE statements - Support USE, DESCRIBE, SHOW, EXPLAIN, SET, OPTIMIZE, SYSTEM - Parse expressions with proper operator precedence - Handle JOINs, subqueries, CTEs, window functions - Support CASE, CAST, EXTRACT, INTERVAL expressions - Parse lambdas, arrays, tuples, and parameters
- Add comprehensive parser tests for SELECT, DDL, and expressions - Test against ClickHouse EXPLAIN AST to verify compatibility - All 39 ClickHouse comparison tests pass - Fix AS alias precedence to properly parse column aliases - Add JSON serialization tests
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