ts-11-mini-sql
0.269
Proposed solution
```ts
export type Row = Record<string, number | string>;
export class QueryError extends Error {}
type Token = {
type: 'keyword' | 'identifier' | 'operator' | 'value' | 'comma' | 'eof';
value: string;
line: number;
column: number;
};
type ASTNode =
| { type: 'select'; columns: string[]; table: string; where?: WhereClause; orderBy?: OrderByClause; limit?: number }
| { type: 'where'; condition: Condition }
| { type: 'condition'; left: string; operator: string; right: string | number }
| { type: 'orderBy'; column: string; direction: 'asc' | 'desc' }
| { type: 'limit'; count: number };
type WhereClause = {
type: 'where';
condition: Condition;
};
type OrderByClause = {
type: 'orderBy';
column: string;
direction: 'asc' | 'desc';
};
type Condition =
| { type: 'comparison'; left: string; operator: string; right: string | number }
| { type: 'logical'; left: Condition; operator: 'AND' | 'OR'; right: Condition };
const KEYWORDS = new Set(['SELECT', 'FROM', 'WHERE', 'ORDER', 'BY', 'ASC', 'DESC', 'LIMIT']);
const OPERATORS = new Set(['=', '!=', '<', '>', '<=', '>=']);
function tokenize(sql: string): Token[] {
const tokens: Token[] = [];
let i = 0;
let line = 1;
let column = 0;
while (i < sql.length) {
const char = sql[i];
if (char === ' ' || char === '\t') {
i++;
column++;
continue;
}
if (char === '\n') {
line++;
column = 0;
i++;
continue;
}
if (char === "'") {
// String literal
let j = i + 1;
let value = "'";
while (j < sql.length && sql[j] !== "'") {
value += sql[j];
j++;
}
if (j >= sql.length) {
throw new QueryError(`Unterminated string literal`);
}
value += "'";
tokens.push({ type: 'value', value, line, column });
i = j + 1;
column = j + 1;
continue;
}
if (char === ',') {
tokens.push({ type: 'comma', value: ',', line, column });
i++;
column++;
continue;
}
if (/[a-zA-Z_]/.test(char)) {
// Identifier or keyword
let j = i;
while (j < sql.length && /[a-zA-Z0-9_]/.test(sql[j])) {
j++;
}
const value = sql.substring(i, j).toUpperCase();
tokens.push({ type: 'keyword', value, line, column });
i = j;
column = j;
continue;
}
if (/[0-9]/.test(char)) {
// Number literal
let j = i;
while (j < sql.length && /[0-9]/.test(sql[j])) {
j++;
}
const value = sql.substring(i, j);
tokens.push({ type: 'value', value, line, column });
i = j;
column = j;
continue;
}
if (['=', '<', '>'].includes(char)) {
// Operators
let j = i;
while (j < sql.length && ['=', '<', '>'].includes(sql[j])) {
j++;
}
const value = sql.substring(i, j);
tokens.push({ type: 'operator', value, line, column });
i = j;
column = j;
continue;
}
// Unknown character
throw new QueryError(`Unexpected character: ${char}`);
}
tokens.push({ type: 'eof', value: '', line, column });
return tokens;
}
function parse(tokens: Token[]): ASTNode {
let pos = 0;
function consume(expectedType: string, expectedValue?: string): Token {
if (pos >= tokens.length) {
throw new QueryError(`Unexpected end of query`);
}
const token = tokens[pos];
if (token.type !== expectedType || (expectedValue && token.value !== expectedValue)) {
throw new QueryError(`Expected ${expectedType} ${expectedValue ? `'${expectedValue}'` : ''}, got ${token.type} '${token.value}'`);
}
pos++;
return token;
}
function peek(): Token {
if (pos >= tokens.length) {
return { type: 'eof', value: '', line: 0, column: 0 };
}
return tokens[pos];
}
// SELECT
const selectToken = consume('keyword', 'SELECT');
// Columns
const columns: string[] = [];
while (peek().type !== 'keyword' || peek().value !== 'FROM') {
if (peek().type === 'eof') {
throw new QueryError(`Expected FROM clause`);
}
if (peek().type === 'identifier') {
columns.push(peek().value);
pos++;
} else if (peek().type === 'comma') {
if (columns.length === 0) {
throw new QueryError(`Empty column list`);
}
pos++; // consume comma
} else {
throw new QueryError(`Expected identifier or comma, got ${peek().type}`);
}
// Check for trailing comma
if (peek().type === 'keyword' && peek().value === 'FROM') {
break;
}
}
if (columns.length === 0) {
throw new QueryError(`Empty column list`);
}
// FROM
consume('keyword', 'FROM');
const tableToken = consume('identifier');
const table = tableToken.value;
let whereClause: WhereClause | undefined;
let orderByClause: OrderByClause | undefined;
let limitValue: number | undefined;
// WHERE
if (peek().type === 'keyword' && peek().value === 'WHERE') {
pos++; // consume WHERE
const condition = parseCondition();
whereClause = { type: 'where', condition };
}
// ORDER BY
if (peek().type === 'keyword' && peek().value === 'ORDER') {
pos++; // consume ORDER
consume('keyword', 'BY');
const columnToken = consume('identifier');
const column = columnToken.value;
let direction: 'asc' | 'desc' = 'asc';
if (peek().type === 'keyword') {
if (peek().value === 'ASC') {
pos++;
} else if (peek().value === 'DESC') {
pos++;
direction = 'desc';
}
}
orderByClause = { type: 'orderBy', column, direction };
}
// LIMIT
if (peek().type === 'keyword' && peek().value === 'LIMIT') {
pos++; // consume LIMIT
const limitToken = consume('value');
const num = parseInt(limitToken.value);
if (isNaN(num) || num < 0) {
throw new QueryError(`Invalid LIMIT value: ${limitToken.value}`);
}
limitValue = num;
}
// Check for unexpected tokens
if (peek().type !== 'eof') {
throw new QueryError(`Unexpected token after query: ${peek().value}`);
}
return {
type: 'select',
columns,
table,
where: whereClause,
orderBy: orderByClause,
limit: limitValue
};
}
function parseCondition(): Condition {
return parseLogicalOr();
}
function parseLogicalOr(): Condition {
let left = parseLogicalAnd();
while (peek().type === 'keyword' && peek().value === 'OR') {
const operatorToken = consume('keyword', 'OR');
const right = parseLogicalAnd();
left = { type: 'logical', left, operator: 'OR', right };
}
return left;
}
function parseLogicalAnd(): Condition {
let left = parseComparison();
while (peek().type === 'keyword' && peek().value === 'AND') {
const operatorToken = consume('keyword', 'AND');
const right = parseComparison();
left = { type: 'logical', left, operator: 'AND', right };
}
return left;
}
function parseComparison(): Condition {
const leftToken = consume('identifier');
const left = leftToken.value;
const opToken = consume('operator');
const op = opToken.value;
if (!OPERATORS.has(op)) {
throw new QueryError(`Invalid operator: ${op}`);
}
let rightValue: string | number;
const valueToken = peek();
if (valueToken.type === 'value') {
pos++;
if (valueToken.value.startsWith("'")) {
// String literal
rightValue = valueToken.value.slice(1, -1); // Remove quotes
} else {
// Number literal
const num = parseInt(valueToken.value);
if (isNaN(num)) {
throw new QueryError(`Invalid number: ${valueToken.value}`);
}
rightValue = num;
}
} else {
throw new QueryError(`Expected value, got ${valueToken.type}`);
}
return { type: 'comparison', left, operator: op, right: rightValue };
}
function evaluateCondition(row: Row, condition: Condition): boolean {
if (condition.type === 'comparison') {
const col = condition.left;
const op = condition.operator;
const value = condition.right;
// If column doesn't exist in row, treat as non-match
if (!(col in row)) {
return op === '!=' ? true : false;
}
const cellValue = row[col];
// Type mismatch handling
if (typeof cellValue === 'number' && typeof value === 'string') {
return op === '!=' ? true : false;
}
if (typeof cellValue === 'string' && typeof value === 'number') {
return op === '!=' ? true : false;
}
switch (op) {
case '=': return cellValue === value;
case '!=': return cellValue !== value;
case '<': return cellValue < value;
case '>': return cellValue > value;
case '<=': return cellValue <= value;
case '>=': return cellValue >= value;
default: return false;
}
} else if (condition.type === 'logical') {
const leftResult = evaluateCondition(row, condition.left);
const rightResult = evaluateCondition(row, condition.right);
switch (condition.operator) {
case 'AND': return leftResult && rightResult;
case 'OR': return leftResult || rightResult;
default: return false;
}
}
return false;
}
function sortRows(rows: Row[], orderBy: OrderByClause): Row[] {
const sorted = [...rows];
return sorted.sort((a, b) => {
const col = orderBy.column;
// If column doesn't exist in row, treat as equal
if (!(col in a) || !(col in b)) {
return 0;
}
const aValue = a[col];
const bValue = b[col];
// Type mismatch handling
if (typeof aValue === 'number' && typeof bValue === 'string') {
return 0;
}
if (typeof aValue === 'string' && typeof bValue === 'number') {
return 0;
}
let result: number;
if (typeof aValue === 'number' && typeof bValue === 'number') {
result = aValue - bValue;
} else {
// Both are strings
result = (aValue as string).localeCompare(bValue as string);
}
return orderBy.direction === 'asc' ? result : -result;
});
}
function projectRows(rows: Row[], columns: string[]): Row[] {
return rows.map(row => {
const newRow: Row = {};
for (const col of columns) {
if (col in row) {
newRow[col] = row[col];
}
}
return newRow;
});
}
export function query(sql: string, rows: Row[]): Row[] {
try {
const tokens = tokenize(sql);
const ast = parse(tokens);
// WHERE filtering
let filteredRows = rows;
if (ast.where) {
filteredRows = rows.filter(row => evaluateCondition(row, ast.where!.condition));
}
// ORDER BY sorting
let sortedRows = filteredRows;
if (ast.orderBy) {
sortedRows = sortRows(filteredRows, ast.orderBy);
}
// LIMIT truncation
let limitedRows = sortedRows;
if (ast.limit !== undefined) {
limitedRows = sortedRows.slice(0, ast.limit);
}
// Column projection
let resultRows = limitedRows;
if (ast.columns[0] === '*') {
// Select all columns preserving original row structure
resultRows = limitedRows.map(row => ({ ...row }));
} else {
resultRows = projectRows(limitedRows, ast.columns);
}
return resultRows;
} catch (error) {
if (error instanceof QueryError) {
throw error;
}
throw new QueryError(`Invalid query: ${error}`);
}
}
```Test output (stdout)
ubtest: ORDER BY with missing / mismatched keys does not throw
not ok 17 - ORDER BY with missing / mismatched keys does not throw
---
duration_ms: 0.0274
type: 'test'
location: '/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:1:5086'
failureType: 'testCodeFailure'
error: 'Unexpected character: *'
code: 'ERR_TEST_FAILURE'
stack: |-
tokenize (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:124:11)
query (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:402:20)
TestContext.<anonymous> (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:185:15)
Test.runInAsyncScope (node:async_hooks:227:14)
Test.run (node:internal/test_runner/test:1306:25)
Test.processPendingSubtests (node:internal/test_runner/test:897:18)
Test.postRun (node:internal/test_runner/test:1447:19)
Test.run (node:internal/test_runner/test:1372:12)
async Test.processPendingSubtests (node:internal/test_runner/test:897:7)
...
# Subtest: keywords are case-insensitive; identifiers/strings are not
not ok 18 - keywords are case-insensitive; identifiers/strings are not
---
duration_ms: 0.05146
type: 'test'
location: '/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:1:5264'
failureType: 'testCodeFailure'
error: 'Expected identifier or comma, got keyword'
code: 'ERR_TEST_FAILURE'
stack: |-
parse (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:174:13)
query (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:403:17)
TestContext.<anonymous> (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:190:15)
Test.runInAsyncScope (node:async_hooks:227:14)
Test.run (node:internal/test_runner/test:1306:25)
Test.processPendingSubtests (node:internal/test_runner/test:897:18)
Test.postRun (node:internal/test_runner/test:1447:19)
Test.run (node:internal/test_runner/test:1372:12)
async Test.processPendingSubtests (node:internal/test_runner/test:897:7)
...
# Subtest: no WHERE returns all rows; whitespace is tolerated
not ok 19 - no WHERE returns all rows; whitespace is tolerated
---
duration_ms: 0.0271
type: 'test'
location: '/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:1:5624'
failureType: 'testCodeFailure'
error: 'Unexpected character: *'
code: 'ERR_TEST_FAILURE'
stack: |-
tokenize (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:124:11)
query (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:402:20)
TestContext.<anonymous> (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:203:16)
Test.runInAsyncScope (node:async_hooks:227:14)
Test.run (node:internal/test_runner/test:1306:25)
Test.processPendingSubtests (node:internal/test_runner/test:897:18)
Test.postRun (node:internal/test_runner/test:1447:19)
Test.run (node:internal/test_runner/test:1372:12)
async Test.processPendingSubtests (node:internal/test_runner/test:897:7)
...
# Subtest: throws: missing SELECT
ok 20 - throws: missing SELECT
---
duration_ms: 0.202742
type: 'test'
...
# Subtest: throws: missing FROM
ok 21 - throws: missing FROM
---
duration_ms: 0.06532
type: 'test'
...
# Subtest: throws: empty / malformed column list
ok 22 - throws: empty / malformed column list
---
duration_ms: 0.053931
type: 'test'
...
# Subtest: throws: bad operator and malformed comparison
ok 23 - throws: bad operator and malformed comparison
---
duration_ms: 0.07179
type: 'test'
...
# Subtest: throws: unterminated string literal
ok 24 - throws: unterminated string literal
---
duration_ms: 0.0413
type: 'test'
...
# Subtest: throws: bad LIMIT (missing, negative, non-integer, string)
ok 25 - throws: bad LIMIT (missing, negative, non-integer, string)
---
duration_ms: 0.042731
type: 'test'
...
# Subtest: throws: unknown clause / leftover tokens
ok 26 - throws: unknown clause / leftover tokens
---
duration_ms: 0.05373
type: 'test'
...
1..26
# tests 26
# suites 0
# pass 7
# fail 19
# cancelled 0
# skipped 0
# todo 0
# duration_ms 82.562174
Self-repair attempts
[
{
"total": 26,
"answer": "```ts\nexport type Row = Record<string, number | string>;\n\nexport class QueryError extends Error {}\n\ntype Token = {\n type: 'keyword' | 'identifier' | 'operator' | 'value' | 'comma' | 'eof';\n value: string;\n line: number;\n column: number;\n};\n\ntype ASTNode =\n | { type: 'select'; columns: string[]; table: string; where?: WhereClause; orderBy?: OrderByClause; limit?: number }\n | { type: 'where'; condition: Condition }\n | { type: 'condition'; left: string; operator: string; right: string | number }\n | { type: 'orderBy'; column: string; direction: 'asc' | 'desc' }\n | { type: 'limit'; count: number };\n\ntype WhereClause = {\n type: 'where';\n condition: Condition;\n};\n\ntype OrderByClause = {\n type: 'orderBy';\n column: string;\n direction: 'asc' | 'desc';\n};\n\ntype Condition = \n | { type: 'comparison'; left: string; operator: string; right: string | number }\n | { type: 'logical'; left: Condition; operator: 'AND' | 'OR'; right: Condition };\n\nconst KEYWORDS = new Set(['SELECT', 'FROM', 'WHERE', 'ORDER', 'BY', 'ASC', 'DESC', 'LIMIT']);\nconst OPERATORS = new Set(['=', '!=', '<', '>', '<=', '>=']);\n\nfunction tokenize(sql: string): Token[] {\n const tokens: Token[] = [];\n let i = 0;\n let line = 1;\n let column = 0;\n\n while (i < sql.length) {\n const char = sql[i];\n \n if (char === ' ' || char === '\\t') {\n i++;\n column++;\n continue;\n }\n \n if (char === '\\n') {\n line++;\n column = 0;\n i++;\n continue;\n }\n \n if (char === \"'\") {\n // String literal\n let j = i + 1;\n let value = \"'\";\n while (j < sql.length && sql[j] !== \"'\") {\n value += sql[j];\n j++;\n }\n if (j >= sql.length) {\n throw new QueryError(`Unterminated string literal`);\n }\n value += \"'\";\n tokens.push({ type: 'value', value, line, column });\n i = j + 1;\n column = j + 1;\n continue;\n }\n \n if (char === ',') {\n tokens.push({ type: 'comma', value: ',', line, column });\n i++;\n column++;\n continue;\n }\n \n if (/[a-zA-Z_]/.test(char)) {\n // Identifier or keyword\n let j = i;\n while (j < sql.length && /[a-zA-Z0-9_]/.test(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j).toUpperCase();\n tokens.push({ type: 'keyword', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n if (/[0-9]/.test(char)) {\n // Number literal\n let j = i;\n while (j < sql.length && /[0-9]/.test(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j);\n tokens.push({ type: 'value', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n if (['=', '<', '>'].includes(char)) {\n // Operators\n let j = i;\n while (j < sql.length && ['=', '<', '>'].includes(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j);\n tokens.push({ type: 'operator', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n // Unknown character\n throw new QueryError(`Unexpected character: ${char}`);\n }\n \n tokens.push({ type: 'eof', value: '', line, column });\n return tokens;\n}\n\nfunction parse(tokens: Token[]): ASTNode {\n let pos = 0;\n \n function consume(expectedType: string, expectedValue?: string): Token {\n if (pos >= tokens.length) {\n throw new QueryError(`Unexpected end of query`);\n }\n \n const token = tokens[pos];\n if (token.type !== expectedType || (expectedValue && token.value !== expectedValue)) {\n throw new QueryError(`Expected ${expectedType} ${expectedValue ? `'${expectedValue}'` : ''}, got ${token.type} '${token.value}'`);\n }\n \n pos++;\n return token;\n }\n \n function peek(): Token {\n if (pos >= tokens.length) {\n return { type: 'eof', value: '', line: 0, column: 0 };\n }\n return tokens[pos];\n }\n \n // SELECT\n const selectToken = consume('keyword', 'SELECT');\n \n // Columns\n const columns: string[] = [];\n while (peek().type !== 'keyword' || peek().value !== 'FROM') {\n if (peek().type === 'eof') {\n throw new QueryError(`Expected FROM clause`);\n }\n \n if (peek().type === 'identifier') {\n columns.push(peek().value);\n pos++;\n } else if (peek().type === 'comma') {\n if (columns.length === 0) {\n throw new QueryError(`Empty column list`);\n }\n pos++; // consume comma\n } else {\n throw new QueryError(`Expected identifier or comma, got ${peek().type}`);\n }\n \n // Check for trailing comma\n if (peek().type === 'keyword' && peek().value === 'FROM') {\n break;\n }\n }\n \n if (columns.length === 0) {\n throw new QueryError(`Empty column list`);\n }\n \n // FROM\n consume('keyword', 'FROM');\n const tableToken = consume('identifier');\n const table = tableToken.value;\n \n let whereClause: WhereClause | undefined;\n let orderByClause: OrderByClause | undefined;\n let limitValue: number | undefined;\n \n // WHERE\n if (peek().type === 'keyword' && peek().value === 'WHERE') {\n pos++; // consume WHERE\n const condition = parseCondition();\n whereClause = { type: 'where', condition };\n }\n \n // ORDER BY\n if (peek().type === 'keyword' && peek().value === 'ORDER') {\n pos++; // consume ORDER\n consume('keyword', 'BY');\n const columnToken = consume('identifier');\n const column = columnToken.value;\n \n let direction: 'asc' | 'desc' = 'asc';\n if (peek().type === 'keyword') {\n if (peek().value === 'ASC') {\n pos++;\n } else if (peek().value === 'DESC') {\n pos++;\n direction = 'desc';\n }\n }\n \n orderByClause = { type: 'orderBy', column, direction };\n }\n \n // LIMIT\n if (peek().type === 'keyword' && peek().value === 'LIMIT') {\n pos++; // consume LIMIT\n const limitToken = consume('value');\n const num = parseInt(limitToken.value);\n if (isNaN(num) || num < 0) {\n throw new QueryError(`Invalid LIMIT value: ${limitToken.value}`);\n }\n limitValue = num;\n }\n \n // Check for unexpected tokens\n if (peek().type !== 'eof') {\n throw new QueryError(`Unexpected token after query: ${peek().value}`);\n }\n \n return {\n type: 'select',\n columns,\n table,\n where: whereClause,\n orderBy: orderByClause,\n limit: limitValue\n };\n}\n\nfunction parseCondition(): Condition {\n return parseLogicalOr();\n}\n\nfunction parseLogicalOr(): Condition {\n let left = parseLogicalAnd();\n \n while (peek().type === 'keyword' && peek().value === 'OR') {\n const operatorToken = consume('keyword', 'OR');\n const right = parseLogicalAnd();\n left = { type: 'logical', left, operator: 'OR', right };\n }\n \n return left;\n}\n\nfunction parseLogicalAnd(): Condition {\n let left = parseComparison();\n \n while (peek().type === 'keyword' && peek().value === 'AND') {\n const operatorToken = consume('keyword', 'AND');\n const right = parseComparison();\n left = { type: 'logical', left, operator: 'AND', right };\n }\n \n return left;\n}\n\nfunction parseComparison(): Condition {\n const leftToken = consume('identifier');\n const left = leftToken.value;\n \n const opToken = consume('operator');\n const op = opToken.value;\n \n if (!OPERATORS.has(op)) {\n throw new QueryError(`Invalid operator: ${op}`);\n }\n \n let rightValue: string | number;\n const valueToken = peek();\n if (valueToken.type === 'value') {\n pos++;\n if (valueToken.value.startsWith(\"'\")) {\n // String literal\n rightValue = valueToken.value.slice(1, -1); // Remove quotes\n } else {\n // Number literal\n const num = parseInt(valueToken.value);\n if (isNaN(num)) {\n throw new QueryError(`Invalid number: ${valueToken.value}`);\n }\n rightValue = num;\n }\n } else {\n throw new QueryError(`Expected value, got ${valueToken.type}`);\n }\n \n return { type: 'comparison', left, operator: op, right: rightValue };\n}\n\nfunction evaluateCondition(row: Row, condition: Condition): boolean {\n if (condition.type === 'comparison') {\n const col = condition.left;\n const op = condition.operator;\n const value = condition.right;\n \n // If column doesn't exist in row, treat as non-match\n if (!(col in row)) {\n return op === '!=' ? true : false;\n }\n \n const cellValue = row[col];\n \n // Type mismatch handling\n if (typeof cellValue === 'number' && typeof value === 'string') {\n return op === '!=' ? true : false;\n }\n if (typeof cellValue === 'string' && typeof value === 'number') {\n return op === '!=' ? true : false;\n }\n \n switch (op) {\n case '=': return cellValue === value;\n case '!=': return cellValue !== value;\n case '<': return cellValue < value;\n case '>': return cellValue > value;\n case '<=': return cellValue <= value;\n case '>=': return cellValue >= value;\n default: return false;\n }\n } else if (condition.type === 'logical') {\n const leftResult = evaluateCondition(row, condition.left);\n const rightResult = evaluateCondition(row, condition.right);\n \n switch (condition.operator) {\n case 'AND': return leftResult && rightResult;\n case 'OR': return leftResult || rightResult;\n default: return false;\n }\n }\n \n return false;\n}\n\nfunction sortRows(rows: Row[], orderBy: OrderByClause): Row[] {\n const sorted = [...rows];\n \n return sorted.sort((a, b) => {\n const col = orderBy.column;\n \n // If column doesn't exist in row, treat as equal\n if (!(col in a) || !(col in b)) {\n return 0;\n }\n \n const aValue = a[col];\n const bValue = b[col];\n \n // Type mismatch handling\n if (typeof aValue === 'number' && typeof bValue === 'string') {\n return 0;\n }\n if (typeof aValue === 'string' && typeof bValue === 'number') {\n return 0;\n }\n \n let result: number;\n if (typeof aValue === 'number' && typeof bValue === 'number') {\n result = aValue - bValue;\n } else {\n // Both are strings\n result = (aValue as string).localeCompare(bValue as string);\n }\n \n return orderBy.direction === 'asc' ? result : -result;\n });\n}\n\nfunction projectRows(rows: Row[], columns: string[]): Row[] {\n return rows.map(row => {\n const newRow: Row = {};\n for (const col of columns) {\n if (col in row) {\n newRow[col] = row[col];\n }\n }\n return newRow;\n });\n}\n\nexport function query(sql: string, rows: Row[]): Row[] {\n try {\n const tokens = tokenize(sql);\n const ast = parse(tokens);\n \n // WHERE filtering\n let filteredRows = rows;\n if (ast.where) {\n filteredRows = rows.filter(row => evaluateCondition(row, ast.where!.condition));\n }\n \n // ORDER BY sorting\n let sortedRows = filteredRows;\n if (ast.orderBy) {\n sortedRows = sortRows(filteredRows, ast.orderBy);\n }\n \n // LIMIT truncation\n let limitedRows = sortedRows;\n if (ast.limit !== undefined) {\n limitedRows = sortedRows.slice(0, ast.limit);\n }\n \n // Column projection\n let resultRows = limitedRows;\n if (ast.columns[0] === '*') {\n // Select all columns preserving original row structure\n resultRows = limitedRows.map(row => ({ ...row }));\n } else {\n resultRows = projectRows(limitedRows, ast.columns);\n }\n \n return resultRows;\n } catch (error) {\n if (error instanceof QueryError) {\n throw error;\n }\n throw new QueryError(`Invalid query: ${error}`);\n }\n}\n```",
"passed": 7,
"test_error": "(/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:190:15)\n Test.runInAsyncScope (node:async_hooks:227:14)\n Test.run (node:internal/test_runner/test:1306:25)\n Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n Test.postRun (node:internal/test_runner/test:1447:19)\n Test.run (node:internal/test_runner/test:1372:12)\n async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n ...\n# Subtest: no WHERE returns all rows; whitespace is tolerated\nnot ok 19 - no WHERE returns all rows; whitespace is tolerated\n ---\n duration_ms: 0.0271\n type: 'test'\n location: '/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:1:5624'\n failureType: 'testCodeFailure'\n error: 'Unexpected character: *'\n code: 'ERR_TEST_FAILURE'\n stack: |-\n tokenize (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:124:11)\n query (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.ts:402:20)\n TestContext.<anonymous> (/tmp/llmlab-ts-11-mini-sql-k6ity7rh/solution.test.ts:203:16)\n Test.runInAsyncScope (node:async_hooks:227:14)\n Test.run (node:internal/test_runner/test:1306:25)\n Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n Test.postRun (node:internal/test_runner/test:1447:19)\n Test.run (node:internal/test_runner/test:1372:12)\n async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n ...\n# Subtest: throws: missing SELECT\nok 20 - throws: missing SELECT\n ---\n duration_ms: 0.202742\n type: 'test'\n ...\n# Subtest: throws: missing FROM\nok 21 - throws: missing FROM\n ---\n duration_ms: 0.06532\n type: 'test'\n ...\n# Subtest: throws: empty / malformed column list\nok 22 - throws: empty / malformed column list\n ---\n duration_ms: 0.053931\n type: 'test'\n ...\n# Subtest: throws: bad operator and malformed comparison\nok 23 - throws: bad operator and malformed comparison\n ---\n duration_ms: 0.07179\n type: 'test'\n ...\n# Subtest: throws: unterminated string literal\nok 24 - throws: unterminated string literal\n ---\n duration_ms: 0.0413\n type: 'test'\n ...\n# Subtest: throws: bad LIMIT (missing, negative, non-integer, string)\nok 25 - throws: bad LIMIT (missing, negative, non-integer, string)\n ---\n duration_ms: 0.042731\n type: 'test'\n ...\n# Subtest: throws: unknown clause / leftover tokens\nok 26 - throws: unknown clause / leftover tokens\n ---\n duration_ms: 0.05373\n type: 'test'\n ...\n1..26\n# tests 26\n# suites 0\n# pass 7\n# fail 19\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 82.562174"
},
{
"total": 26,
"answer": "Looking at the error message \"Unexpected character: *\" and the test failures, I can see there's an issue with how I'm parsing column lists. The problem is in my tokenization logic - when I encounter a `*` character, it's being treated as an operator instead of a special case for \"all columns\".\n\nLet me fix the implementation:\n\n```ts\nexport type Row = Record<string, number | string>;\n\nexport class QueryError extends Error {}\n\ntype Token = {\n type: 'keyword' | 'identifier' | 'operator' | 'value' | 'comma' | 'eof' | 'star';\n value: string;\n line: number;\n column: number;\n};\n\ntype ASTNode =\n | { type: 'select'; columns: string[]; table: string; where?: WhereClause; orderBy?: OrderByClause; limit?: number }\n | { type: 'where'; condition: Condition }\n | { type: 'condition'; left: string; operator: string; right: string | number }\n | { type: 'orderBy'; column: string; direction: 'asc' | 'desc' }\n | { type: 'limit'; count: number };\n\ntype WhereClause = {\n type: 'where';\n condition: Condition;\n};\n\ntype OrderByClause = {\n type: 'orderBy';\n column: string;\n direction: 'asc' | 'desc';\n};\n\ntype Condition = \n | { type: 'comparison'; left: string; operator: string; right: string | number }\n | { type: 'logical'; left: Condition; operator: 'AND' | 'OR'; right: Condition };\n\nconst KEYWORDS = new Set(['SELECT', 'FROM', 'WHERE', 'ORDER', 'BY', 'ASC', 'DESC', 'LIMIT']);\nconst OPERATORS = new Set(['=', '!=', '<', '>', '<=', '>=']);\n\nfunction tokenize(sql: string): Token[] {\n const tokens: Token[] = [];\n let i = 0;\n let line = 1;\n let column = 0;\n\n while (i < sql.length) {\n const char = sql[i];\n \n if (char === ' ' || char === '\\t') {\n i++;\n column++;\n continue;\n }\n \n if (char === '\\n') {\n line++;\n column = 0;\n i++;\n continue;\n }\n \n if (char === \"'\") {\n // String literal\n let j = i + 1;\n let value = \"'\";\n while (j < sql.length && sql[j] !== \"'\") {\n value += sql[j];\n j++;\n }\n if (j >= sql.length) {\n throw new QueryError(`Unterminated string literal`);\n }\n value += \"'\";\n tokens.push({ type: 'value', value, line, column });\n i = j + 1;\n column = j + 1;\n continue;\n }\n \n if (char === ',') {\n tokens.push({ type: 'comma', value: ',', line, column });\n i++;\n column++;\n continue;\n }\n \n if (char === '*') {\n tokens.push({ type: 'star', value: '*', line, column });\n i++;\n column++;\n continue;\n }\n \n if (/[a-zA-Z_]/.test(char)) {\n // Identifier or keyword\n let j = i;\n while (j < sql.length && /[a-zA-Z0-9_]/.test(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j).toUpperCase();\n tokens.push({ type: 'keyword', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n if (/[0-9]/.test(char)) {\n // Number literal\n let j = i;\n while (j < sql.length && /[0-9]/.test(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j);\n tokens.push({ type: 'value', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n if (['=', '<', '>'].includes(char)) {\n // Operators\n let j = i;\n while (j < sql.length && ['=', '<', '>'].includes(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j);\n tokens.push({ type: 'operator', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n // Unknown character\n throw new QueryError(`Unexpected character: ${char}`);\n }\n \n tokens.push({ type: 'eof', value: '', line, column });\n return tokens;\n}\n\nfunction parse(tokens: Token[]): ASTNode {\n let pos = 0;\n \n function consume(expectedType: string, expectedValue?: string): Token {\n if (pos >= tokens.length) {\n throw new QueryError(`Unexpected end of query`);\n }\n \n const token = tokens[pos];\n if (token.type !== expectedType || (expectedValue && token.value !== expectedValue)) {\n throw new QueryError(`Expected ${expectedType} ${expectedValue ? `'${expectedValue}'` : ''}, got ${token.type} '${token.value}'`);\n }\n \n pos++;\n return token;\n }\n \n function peek(): Token {\n if (pos >= tokens.length) {\n return { type: 'eof', value: '', line: 0, column: 0 };\n }\n return tokens[pos];\n }\n \n // SELECT\n const selectToken = consume('keyword', 'SELECT');\n \n // Columns\n const columns: string[] = [];\n while (peek().type !== 'keyword' || peek().value !== 'FROM') {\n if (peek().type === 'eof') {\n throw new QueryError(`Expected FROM clause`);\n }\n \n if (peek().type === 'identifier') {\n columns.push(peek().value);\n pos++;\n } else if (peek().type === 'star') {\n // Handle *\n columns.push('*');\n pos++;\n } else if (peek().type === 'comma') {\n if (columns.length === 0) {\n throw new QueryError(`Empty column list`);\n }\n pos++; // consume comma\n } else {\n throw new QueryError(`Expected identifier, star, or comma, got ${peek().type}`);\n }\n \n // Check for trailing comma\n if (peek().type === 'keyword' && peek().value === 'FROM') {\n break;\n }\n }\n \n if (columns.length === 0) {\n throw new QueryError(`Empty column list`);\n }\n \n // FROM\n consume('keyword', 'FROM');\n const tableToken = consume('identifier');\n const table = tableToken.value;\n \n let whereClause: WhereClause | undefined;\n let orderByClause: OrderByClause | undefined;\n let limitValue: number | undefined;\n \n // WHERE\n if (peek().type === 'keyword' && peek().value === 'WHERE') {\n pos++; // consume WHERE\n const condition = parseCondition();\n whereClause = { type: 'where', condition };\n }\n \n // ORDER BY\n if (peek().type === 'keyword' && peek().value === 'ORDER') {\n pos++; // consume ORDER\n consume('keyword', 'BY');\n const columnToken = consume('identifier');\n const column = columnToken.value;\n \n let direction: 'asc' | 'desc' = 'asc';\n if (peek().type === 'keyword') {\n if (peek().value === 'ASC') {\n pos++;\n } else if (peek().value === 'DESC') {\n pos++;\n direction = 'desc';\n }\n }\n \n orderByClause = { type: 'orderBy', column, direction };\n }\n \n // LIMIT\n if (peek().type === 'keyword' && peek().value === 'LIMIT') {\n pos++; // consume LIMIT\n const limitToken = consume('value');\n const num = parseInt(limitToken.value);\n if (isNaN(num) || num < 0) {\n throw new QueryError(`Invalid LIMIT value: ${limitToken.value}`);\n }\n limitValue = num;\n }\n \n // Check for unexpected tokens\n if (peek().type !== 'eof') {\n throw new QueryError(`Unexpected token after query: ${peek().value}`);\n }\n \n return {\n type: 'select',\n columns,\n table,\n where: whereClause,\n orderBy: orderByClause,\n limit: limitValue\n };\n}\n\nfunction parseCondition(): Condition {\n return parseLogicalOr();\n}\n\nfunction parseLogicalOr(): Condition {\n let left = parseLogicalAnd();\n \n while (peek().type === 'keyword' && peek().value === 'OR') {\n const operatorToken = consume('keyword', 'OR');\n const right = parseLogicalAnd();\n left = { type: 'logical', left, operator: 'OR', right };\n }\n \n return left;\n}\n\nfunction parseLogicalAnd(): Condition {\n let left = parseComparison();\n \n while (peek().type === 'keyword' && peek().value === 'AND') {\n const operatorToken = consume('keyword', 'AND');\n const right = parseComparison();\n left = { type: 'logical', left, operator: 'AND', right };\n }\n \n return left;\n}\n\nfunction parseComparison(): Condition {\n const leftToken = consume('identifier');\n const left = leftToken.value;\n \n const opToken = consume('operator');\n const op = opToken.value;\n \n if (!OPERATORS.has(op)) {\n throw new QueryError(`Invalid operator: ${op}`);\n }\n \n let rightValue: string | number;\n const valueToken = peek();\n if (valueToken.type === 'value') {\n pos++;\n if (valueToken.value.startsWith(\"'\")) {\n // String literal\n rightValue = valueToken.value.slice(1, -1); // Remove quotes\n } else {\n // Number literal\n const num = parseInt(valueToken.value);\n if (isNaN(num)) {\n throw new QueryError(`Invalid number: ${valueToken.value}`);\n }\n rightValue = num;\n }\n } else {\n throw new QueryError(`Expected value, got ${valueToken.type}`);\n }\n \n return { type: 'comparison', left, operator: op, right: rightValue };\n}\n\nfunction evaluateCondition(row: Row, condition: Condition): boolean {\n if (condition.type === 'comparison') {\n const col = condition.left;\n const op = condition.operator;\n const value = condition.right;\n \n // If column doesn't exist in row, treat as non-match\n if (!(col in row)) {\n return op === '!=' ? true : false;\n }\n \n const cellValue = row[col];\n \n // Type mismatch handling\n if (typeof cellValue === 'number' && typeof value === 'string') {\n return op === '!=' ? true : false;\n }\n if (typeof cellValue === 'string' && typeof value === 'number') {\n return op === '!=' ? true : false;\n }\n \n switch (op) {\n case '=': return cellValue === value;\n case '!=': return cellValue !== value;\n case '<': return cellValue < value;\n case '>': return cellValue > value;\n case '<=': return cellValue <= value;\n case '>=': return cellValue >= value;\n default: return false;\n }\n } else if (condition.type === 'logical') {\n const leftResult = evaluateCondition(row, condition.left);\n const rightResult = evaluateCondition(row, condition.right);\n \n switch (condition.operator) {\n case 'AND': return leftResult && rightResult;\n case 'OR': return leftResult || rightResult;\n default: return false;\n }\n }\n \n return false;\n}\n\nfunction sortRows(rows: Row[], orderBy: OrderByClause): Row[] {\n const sorted = [...rows];\n \n return sorted.sort((a, b) => {\n const col = orderBy.column;\n \n // If column doesn't exist in row, treat as equal\n if (!(col in a) || !(col in b)) {\n return 0;\n }\n \n const aValue = a[col];\n const bValue = b[col];\n \n // Type mismatch handling\n if (typeof aValue === 'number' && typeof bValue === 'string') {\n return 0;\n }\n if (typeof aValue === 'string' && typeof bValue === 'number') {\n return 0;\n }\n \n let result: number;\n if (typeof aValue === 'number' && typeof bValue === 'number') {\n result = aValue - bValue;\n } else {\n // Both are strings\n result = (aValue as string).localeCompare(bValue as string);\n }\n \n return orderBy.direction === 'asc' ? result : -result;\n });\n}\n\nfunction projectRows(rows: Row[], columns: string[]): Row[] {\n return rows.map(row => {\n const newRow: Row = {};\n for (const col of columns) {\n if (col in row) {\n newRow[col] = row[col];\n }\n }\n return newRow;\n });\n}\n\nexport function query(sql: string, rows: Row[]): Row[] {\n try {\n const tokens = tokenize(sql);\n const ast = parse(tokens);\n \n // WHERE filtering\n let filteredRows = rows;\n if (ast.where) {\n filteredRows = rows.filter(row => evaluateCondition(row, ast.where!.condition));\n }\n \n // ORDER BY sorting\n let sortedRows = filteredRows;\n if (ast.orderBy) {\n sortedRows = sortRows(filteredRows, ast.orderBy);\n }\n \n // LIMIT truncation\n let limitedRows = sortedRows;\n if (ast.limit !== undefined) {\n limitedRows = sortedRows.slice(0, ast.limit);\n }\n \n // Column projection\n let resultRows = limitedRows;\n if (ast.columns[0] === '*') {\n // Select all columns preserving original row structure\n resultRows = limitedRows.map(row => ({ ...row }));\n } else {\n resultRows = projectRows(limitedRows, ast.columns);\n }\n \n return resultRows;\n } catch (error) {\n if (error instanceof QueryError) {\n throw error;\n }\n throw new QueryError(`Invalid query: ${error}`);\n }\n}\n```",
"passed": 7,
"test_error": "cScope (node:async_hooks:227:14)\n Test.run (node:internal/test_runner/test:1306:25)\n Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n Test.postRun (node:internal/test_runner/test:1447:19)\n Test.run (node:internal/test_runner/test:1372:12)\n async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n ...\n# Subtest: no WHERE returns all rows; whitespace is tolerated\nnot ok 19 - no WHERE returns all rows; whitespace is tolerated\n ---\n duration_ms: 0.0282\n type: 'test'\n location: '/tmp/llmlab-ts-11-mini-sql-0do1rvdq/solution.test.ts:1:5624'\n failureType: 'testCodeFailure'\n error: \"Expected identifier , got keyword 'T'\"\n code: 'ERR_TEST_FAILURE'\n stack: |-\n consume (/tmp/llmlab-ts-11-mini-sql-0do1rvdq/solution.ts:148:13)\n parse (/tmp/llmlab-ts-11-mini-sql-0do1rvdq/solution.ts:200:22)\n query (/tmp/llmlab-ts-11-mini-sql-0do1rvdq/solution.ts:414:17)\n TestContext.<anonymous> (/tmp/llmlab-ts-11-mini-sql-0do1rvdq/solution.test.ts:203:16)\n Test.runInAsyncScope (node:async_hooks:227:14)\n Test.run (node:internal/test_runner/test:1306:25)\n Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n Test.postRun (node:internal/test_runner/test:1447:19)\n Test.run (node:internal/test_runner/test:1372:12)\n async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n ...\n# Subtest: throws: missing SELECT\nok 20 - throws: missing SELECT\n ---\n duration_ms: 0.200591\n type: 'test'\n ...\n# Subtest: throws: missing FROM\nok 21 - throws: missing FROM\n ---\n duration_ms: 0.06012\n type: 'test'\n ...\n# Subtest: throws: empty / malformed column list\nok 22 - throws: empty / malformed column list\n ---\n duration_ms: 0.05536\n type: 'test'\n ...\n# Subtest: throws: bad operator and malformed comparison\nok 23 - throws: bad operator and malformed comparison\n ---\n duration_ms: 0.06197\n type: 'test'\n ...\n# Subtest: throws: unterminated string literal\nok 24 - throws: unterminated string literal\n ---\n duration_ms: 0.05522\n type: 'test'\n ...\n# Subtest: throws: bad LIMIT (missing, negative, non-integer, string)\nok 25 - throws: bad LIMIT (missing, negative, non-integer, string)\n ---\n duration_ms: 0.054221\n type: 'test'\n ...\n# Subtest: throws: unknown clause / leftover tokens\nok 26 - throws: unknown clause / leftover tokens\n ---\n duration_ms: 0.05292\n type: 'test'\n ...\n1..26\n# tests 26\n# suites 0\n# pass 7\n# fail 19\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 82.693094"
},
{
"total": 26,
"answer": "Looking at the error \"Expected identifier, got keyword 'T'\" and analyzing the test cases more carefully, I see there are issues with how I'm parsing column lists and handling keywords. The problem is in my parsing logic for columns - when I encounter a keyword like \"FROM\", it's not being handled properly.\n\nLet me rewrite the solution with a cleaner approach:\n\n```ts\nexport type Row = Record<string, number | string>;\n\nexport class QueryError extends Error {}\n\ntype Token = {\n type: 'keyword' | 'identifier' | 'operator' | 'value' | 'comma' | 'eof' | 'star';\n value: string;\n line: number;\n column: number;\n};\n\ntype ASTNode =\n | { type: 'select'; columns: string[]; table: string; where?: WhereClause; orderBy?: OrderByClause; limit?: number }\n | { type: 'where'; condition: Condition }\n | { type: 'condition'; left: string; operator: string; right: string | number }\n | { type: 'orderBy'; column: string; direction: 'asc' | 'desc' }\n | { type: 'limit'; count: number };\n\ntype WhereClause = {\n type: 'where';\n condition: Condition;\n};\n\ntype OrderByClause = {\n type: 'orderBy';\n column: string;\n direction: 'asc' | 'desc';\n};\n\ntype Condition = \n | { type: 'comparison'; left: string; operator: string; right: string | number }\n | { type: 'logical'; left: Condition; operator: 'AND' | 'OR'; right: Condition };\n\nconst KEYWORDS = new Set(['SELECT', 'FROM', 'WHERE', 'ORDER', 'BY', 'ASC', 'DESC', 'LIMIT']);\nconst OPERATORS = new Set(['=', '!=', '<', '>', '<=', '>=']);\n\nfunction tokenize(sql: string): Token[] {\n const tokens: Token[] = [];\n let i = 0;\n let line = 1;\n let column = 0;\n\n while (i < sql.length) {\n const char = sql[i];\n \n if (char === ' ' || char === '\\t') {\n i++;\n column++;\n continue;\n }\n \n if (char === '\\n') {\n line++;\n column = 0;\n i++;\n continue;\n }\n \n if (char === \"'\") {\n // String literal\n let j = i + 1;\n let value = \"'\";\n while (j < sql.length && sql[j] !== \"'\") {\n value += sql[j];\n j++;\n }\n if (j >= sql.length) {\n throw new QueryError(`Unterminated string literal`);\n }\n value += \"'\";\n tokens.push({ type: 'value', value, line, column });\n i = j + 1;\n column = j + 1;\n continue;\n }\n \n if (char === ',') {\n tokens.push({ type: 'comma', value: ',', line, column });\n i++;\n column++;\n continue;\n }\n \n if (char === '*') {\n tokens.push({ type: 'star', value: '*', line, column });\n i++;\n column++;\n continue;\n }\n \n if (/[a-zA-Z_]/.test(char)) {\n // Identifier or keyword\n let j = i;\n while (j < sql.length && /[a-zA-Z0-9_]/.test(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j).toUpperCase();\n tokens.push({ type: 'keyword', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n if (/[0-9]/.test(char)) {\n // Number literal\n let j = i;\n while (j < sql.length && /[0-9]/.test(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j);\n tokens.push({ type: 'value', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n if (['=', '<', '>'].includes(char)) {\n // Operators\n let j = i;\n while (j < sql.length && ['=', '<', '>'].includes(sql[j])) {\n j++;\n }\n const value = sql.substring(i, j);\n tokens.push({ type: 'operator', value, line, column });\n i = j;\n column = j;\n continue;\n }\n \n // Unknown character\n throw new QueryError(`Unexpected character: ${char}`);\n }\n \n tokens.push({ type: 'eof', value: '', line, column });\n return tokens;\n}\n\nfunction parse(tokens: Token[]): ASTNode {\n let pos = 0;\n \n function consume(expectedType: string, expectedValue?: string): Token {\n if (pos >= tokens.length) {\n throw new QueryError(`Unexpected end of query`);\n }\n \n const token = tokens[pos];\n if (token.type !== expectedType || (expectedValue && token.value !== expectedValue)) {\n throw new QueryError(`Expected ${expectedType} ${expectedValue ? `'${expectedValue}'` : ''}, got ${token.type} '${token.value}'`);\n }\n \n pos++;\n return token;\n }\n \n function peek(): Token {\n if (pos >= tokens.length) {\n return { type: 'eof', value: '', line: 0, column: 0 };\n }\n return tokens[pos];\n }\n \n // SELECT\n const selectToken = consume('keyword', 'SELECT');\n \n // Columns - handle both * and identifier lists\n const columns: string[] = [];\n let firstColumnParsed = false;\n \n while (true) {\n const token = peek();\n \n if (token.type === 'eof') {\n throw new QueryError(`Expected FROM clause`);\n }\n \n // Check if we've reached the FROM keyword\n if (token.type === 'keyword' && token.value === 'FROM') {\n break;\n }\n \n if (token.type === 'star') {\n columns.push('*');\n pos++;\n firstColumnParsed = true;\n } else if (token.type === 'identifier') {\n columns.push(token.value);\n pos++;\n firstColumnParsed = true;\n } else if (token.type === 'comma') {\n if (!firstColumnParsed) {\n throw new QueryError(`Empty column list`);\n }\n pos++; // consume comma\n } else {\n throw new QueryError(`Expected identifier, star, or comma, got ${token.type}`);\n }\n }\n \n if (columns.length === 0) {\n throw new QueryError(`Empty column list`);\n }\n \n // FROM\n consume('keyword', 'FROM');\n const tableToken = consume('identifier');\n const table = tableToken.value;\n \n let whereClause: WhereClause | undefined;\n let orderByClause: OrderByClause | undefined;\n let limitValue: number | undefined;\n \n // WHERE\n if (peek().type === 'keyword' && peek().value === 'WHERE') {\n pos++; // consume WHERE\n const condition = parseCondition();\n whereClause = { type: 'where', condition };\n }\n \n // ORDER BY\n if (peek().type === 'keyword' && peek().value === 'ORDER') {\n pos++; // consume ORDER\n consume('keyword', 'BY');\n const columnToken = consume('identifier');\n const column = columnToken.value;\n \n let direction: 'asc' | 'desc' = 'asc';\n if (peek().type === 'keyword') {\n if (peek().value === 'ASC') {\n pos++;\n } else if (peek().value === 'DESC') {\n pos++;\n direction = 'desc';\n }\n }\n \n orderByClause = { type: 'orderBy', column, direction };\n }\n \n // LIMIT\n if (peek().type === 'keyword' && peek().value === 'LIMIT') {\n pos++; // consume LIMIT\n const limitToken = consume('value');\n const num = parseInt(limitToken.value);\n if (isNaN(num) || num < 0) {\n throw new QueryError(`Invalid LIMIT value: ${limitToken.value}`);\n }\n limitValue = num;\n }\n \n // Check for unexpected tokens\n if (peek().type !== 'eof') {\n throw new QueryError(`Unexpected token after query: ${peek().value}`);\n }\n \n return {\n type: 'select',\n columns,\n table,\n where: whereClause,\n orderBy: orderByClause,\n limit: limitValue\n };\n}\n\nfunction parseCondition(): Condition {\n return parseLogicalOr();\n}\n\nfunction parseLogicalOr(): Condition {\n let left = parseLogicalAnd();\n \n while (peek().type === 'keyword' && peek().value === 'OR') {\n const operatorToken = consume('keyword', 'OR');\n const right = parseLogicalAnd();\n left = { type: 'logical', left, operator: 'OR', right };\n }\n \n return left;\n}\n\nfunction parseLogicalAnd(): Condition {\n let left = parseComparison();\n \n while (peek().type === 'keyword' && peek().value === 'AND') {\n const operatorToken = consume('keyword', 'AND');\n const right = parseComparison();\n left = { type: 'logical', left, operator: 'AND', right };\n }\n \n return left;\n}\n\nfunction parseComparison(): Condition {\n const leftToken = consume('identifier');\n const left = leftToken.value;\n \n const opToken = consume('operator');\n const op = opToken.value;\n \n if (!OPERATORS.has(op)) {\n throw new QueryError(`Invalid operator: ${op}`);\n }\n \n let rightValue: string | number;\n const valueToken = peek();\n if (valueToken.type === 'value') {\n pos++;\n if (valueToken.value.startsWith(\"'\")) {\n // String literal\n rightValue = valueToken.value.slice(1, -1); // Remove quotes\n } else {\n // Number literal\n const num = parseInt(valueToken.value);\n if (isNaN(num)) {\n throw new QueryError(`Invalid number: ${valueToken.value}`);\n }\n rightValue = num;\n }\n } else {\n throw new QueryError(`Expected value, got ${valueToken.type}`);\n }\n \n return { type: 'comparison', left, operator: op, right: rightValue };\n}\n\nfunction evaluateCondition(row: Row, condition: Condition): boolean {\n if (condition.type === 'comparison') {\n const col = condition.left;\n const op = condition.operator;\n const value = condition.right;\n \n // If column doesn't exist in row, treat as non-match\n if (!(col in row)) {\n return op === '!=' ? true : false;\n }\n \n const cellValue = row[col];\n \n // Type mismatch handling\n if (typeof cellValue === 'number' && typeof value === 'string') {\n return op === '!=' ? true : false;\n }\n if (typeof cellValue === 'string' && typeof value === 'number') {\n return op === '!=' ? true : false;\n }\n \n switch (op) {\n case '=': return cellValue === value;\n case '!=': return cellValue !== value;\n case '<': return cellValue < value;\n case '>': return cellValue > value;\n case '<=': return cellValue <= value;\n case '>=': return cellValue >= value;\n default: return false;\n }\n } else if (condition.type === 'logical') {\n const leftResult = evaluateCondition(row, condition.left);\n const rightResult = evaluateCondition(row, condition.right);\n \n switch (condition.operator) {\n case 'AND': return leftResult && rightResult;\n case 'OR': return leftResult || rightResult;\n default: return false;\n }\n }\n \n return false;\n}\n\nfunction sortRows(rows: Row[], orderBy: OrderByClause): Row[] {\n const sorted = [...rows];\n \n return sorted.sort((a, b) => {\n const col = orderBy.column;\n \n // If column doesn't exist in row, treat as equal\n if (!(col in a) || !(col in b)) {\n return 0;\n }\n \n const aValue = a[col];\n const bValue = b[col];\n \n // Type mismatch handling\n if (typeof aValue === 'number' && typeof bValue === 'string') {\n return 0;\n }\n if (typeof aValue === 'string' && typeof bValue === 'number') {\n return 0;\n }\n \n let result: number;\n if (typeof aValue === 'number' && typeof bValue === 'number') {\n result = aValue - bValue;\n } else {\n // Both are strings\n result = (aValue as string).localeCompare(bValue as string);\n }\n \n return orderBy.direction === 'asc' ? result : -result;\n });\n}\n\nfunction projectRows(rows: Row[], columns: string[]): Row[] {\n return rows.map(row => {\n const newRow: Row = {};\n for (const col of columns) {\n if (col in row) {\n newRow[col] = row[col];\n }\n }\n return newRow;\n });\n}\n\nexport function query(sql: string, rows: Row[]): Row[] {\n try {\n const tokens = tokenize(sql);\n const ast = parse(tokens);\n \n // WHERE filtering\n let filteredRows = rows;\n if (ast.where) {\n filteredRows = rows.filter(row => evaluateCondition(row, ast.where!.condition));\n }\n \n // ORDER BY sorting\n let sortedRows = filteredRows;\n if (ast.orderBy) {\n sortedRows = sortRows(filteredRows, ast.orderBy);\n }\n \n // LIMIT truncation\n let limitedRows = sortedRows;\n if (ast.limit !== undefined) {\n limitedRows = sortedRows.slice(0, ast.limit);\n }\n \n // Column projection\n let resultRows = limitedRows;\n if (ast.columns[0] === '*') {\n // Select all columns preserving original row structure\n resultRows = limitedRows.map(row => ({ ...row }));\n } else {\n resultRows = projectRows(limitedRows, ast.columns);\n }\n \n return resultRows;\n } catch (error) {\n if (error instanceof QueryError) {\n throw error;\n }\n throw new QueryError(`Invalid query: ${error}`);\n }\n}\n```",
"passed": 7,
"test_error": ""
}
]System prompt
You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.