Method execute

graphlite/src/functions/null_functions.rs:40–58

(&self, context: &FunctionContext)

    }

    fn execute(&self, context: &FunctionContext) -> FunctionResult<Value> {
        // Validate argument count
        context.validate_argument_count(2)?;

        let expr1 = context.get_argument(0)?;
        let expr2 = context.get_argument(1)?;

        // If either expression is NULL, return expr1 (following SQL semantics)
        if expr1.is_null() || expr2.is_null() {
            return Ok(expr1.clone());
        }

        // Compare the values
        if expr1 == expr2 {
            Ok(Value::Null)
        } else {
            Ok(expr1.clone())
        }
    }

    fn return_type(&self) -> &str {
        "Any" // Returns the type of the first expression or NULL