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* SQL Expressions: Add Null-literal node * Retain some order in the code - put NullVal with BoolVal * Add support for `IN` keyword * Add GROUP_CONCAT keyword * Add COLLATE keyword From Claude: The test case demonstrates a simple use of COLLATE with a string literal, but in real MySQL queries, COLLATE is often used in more complex scenarios like: 1. String comparisons: `SELECT * FROM table WHERE name COLLATE utf8mb4_bin = 'John'` 2. Sorting: `SELECT * FROM table ORDER BY name COLLATE utf8mb4_unicode_ci` 3. JOINs: `SELECT * FROM table1 JOIN table2 ON table1.name COLLATE utf8mb4_bin = table2.name` The COLLATE clause is particularly useful when you need case-sensitive comparisons (utf8mb4_bin) or specific language-aware sorting rules.