//! Expression evaluation
//!
//! This module implements expression evaluation organized into:
//! - `eval` - Main evaluation entry point and column references
//! - `predicates` - BETWEEN, LIKE, IN list, POSITION, CAST
//! - `subqueries` - Subquery evaluation (scalar, IN, EXISTS, quantified)
//! - `special` - CASE expressions and function calls
//! - `operators` - Operator evaluation (unary +/-)
//! - `fulltext` - Full-text search evaluation (MATCH...AGAINST)
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