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LINT_ST_006: Structure column order.
SQLFluff ST06 parity: prefer wildcards first, then simple column references and casts, before complex expressions (aggregates, window functions, etc.) in SELECT projection lists.
The rule only applies to order-insensitive SELECTs: it skips INSERT, MERGE, CREATE TABLE AS, and SELECTs participating in UNION/set operations (where column position is semantically significant).