Fix 67 parser issues: DROP TABLE multiple tables, negative literals, empty tuple ORDER BY #14
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…empty tuple ORDER BY Parser improvements: - DROP TABLE with multiple tables: now captures all table names in Tables slice - ORDER BY (): now stores empty tuple literal instead of discarding it - PRIMARY KEY (): same fix as ORDER BY for empty tuples - Multiple table parsing handles qualified names (db.table) Explain layer improvements: - Negative integer/float literals output as Literal Int64_-N instead of Function negate - Empty tuple in ORDER BY/PRIMARY KEY renders as Function tuple with empty ExpressionList - DROP TABLE with multiple tables renders ExpressionList with TableIdentifiers - Added FormatFloat helper function for consistent float formatting Test results: 6,000 passing (87.9%) vs previous 5,933 (86.9%) 67 additional tests now pass, skipped reduced from 891 to 824
The lexer now properly unescapes string literals: - \' → single quote - \\ → backslash - \n → newline - \t → tab - \r → carriage return - \0 → null byte - \b → backspace - \f → form feed - \xNN → hex byte value - '' → single quote (SQL-style escape) The explain layer re-escapes these characters for display in EXPLAIN AST output, using ClickHouse's double-escaping format (e.g., null becomes \\0). Test results improved from 6,000 to 6,006 passing tests.
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Parser improvements:
Explain layer improvements:
Test results: 6,000 passing (87.9%) vs previous 5,933 (86.9%)
67 additional tests now pass, skipped reduced from 891 to 824