tegdb 0.5.0

The name TegridyDB (short for TegDB) is inspired by the Tegridy Farm in South Park and tries to correct some of the wrong database implementations, such as null support, implicit conversion support, etc.
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//! Test parsing of arithmetic expressions in UPDATE statements

use tegdb::parser::*;

#[test]
fn test_parse_arithmetic_expressions() {
    // Test simple addition
    let sql = "UPDATE users SET age = age + 5";
    let result = parse_sql(sql);
    assert!(result.is_ok());
    let statement = result.unwrap();
    match statement {
        Statement::Update(update) => {
            assert_eq!(update.table, "users");
            assert_eq!(update.assignments.len(), 1);
            assert_eq!(update.assignments[0].column, "age");

            // Check that we have a binary operation
            match &update.assignments[0].value {
                Expression::BinaryOp {
                    left,
                    operator,
                    right,
                } => {
                    assert_eq!(**left, Expression::Column("age".to_string()));
                    assert_eq!(*operator, ArithmeticOperator::Add);
                    assert_eq!(**right, Expression::Value(SqlValue::Integer(5)));
                }
                _ => panic!("Expected BinaryOp expression"),
            }
        }
        _ => panic!("Expected UPDATE statement"),
    }
}

#[test]
fn test_parse_all_arithmetic_operators() {
    let test_cases = vec![
        ("UPDATE t SET x = x + 1", ArithmeticOperator::Add),
        ("UPDATE t SET x = x - 1", ArithmeticOperator::Subtract),
        ("UPDATE t SET x = x * 2", ArithmeticOperator::Multiply),
        ("UPDATE t SET x = x / 4", ArithmeticOperator::Divide),
    ];

    for (sql, expected_op) in test_cases {
        let result = parse_sql(sql);
        assert!(result.is_ok(), "Failed to parse: {sql}");
        let statement = result.unwrap();

        match statement {
            Statement::Update(update) => match &update.assignments[0].value {
                Expression::BinaryOp { operator, .. } => {
                    assert_eq!(*operator, expected_op, "Wrong operator for: {sql}");
                }
                _ => panic!("Expected BinaryOp for: {sql}"),
            },
            _ => panic!("Expected UPDATE statement for: {sql}"),
        }
    }
}

#[test]
fn test_parse_complex_arithmetic_expressions() {
    // Test operator precedence: multiplication before addition
    let sql = "UPDATE users SET total = price + quantity * rate";
    let result = parse_sql(sql);
    assert!(result.is_ok());
    let statement = result.unwrap();

    match statement {
        Statement::Update(update) => {
            match &update.assignments[0].value {
                Expression::BinaryOp {
                    left,
                    operator,
                    right,
                } => {
                    // Should be: price + (quantity * rate)
                    assert_eq!(**left, Expression::Column("price".to_string()));
                    assert_eq!(*operator, ArithmeticOperator::Add);

                    // Right side should be a multiplication
                    match &**right {
                        Expression::BinaryOp {
                            left: mult_left,
                            operator: mult_op,
                            right: mult_right,
                        } => {
                            assert_eq!(**mult_left, Expression::Column("quantity".to_string()));
                            assert_eq!(*mult_op, ArithmeticOperator::Multiply);
                            assert_eq!(**mult_right, Expression::Column("rate".to_string()));
                        }
                        _ => panic!("Expected multiplication on right side"),
                    }
                }
                _ => panic!("Expected BinaryOp expression"),
            }
        }
        _ => panic!("Expected UPDATE statement"),
    }
}

#[test]
fn test_parse_parenthesized_expressions() {
    // Test parentheses override precedence: (price + quantity) * rate
    let sql = "UPDATE users SET total = (price + quantity) * rate";
    let result = parse_sql(sql);
    assert!(result.is_ok());
    let statement = result.unwrap();

    match statement {
        Statement::Update(update) => {
            match &update.assignments[0].value {
                Expression::BinaryOp {
                    left,
                    operator,
                    right,
                } => {
                    // Should be: (price + quantity) * rate
                    assert_eq!(*operator, ArithmeticOperator::Multiply);
                    assert_eq!(**right, Expression::Column("rate".to_string()));

                    // Left side should be an addition
                    match &**left {
                        Expression::BinaryOp {
                            left: add_left,
                            operator: add_op,
                            right: add_right,
                        } => {
                            assert_eq!(**add_left, Expression::Column("price".to_string()));
                            assert_eq!(*add_op, ArithmeticOperator::Add);
                            assert_eq!(**add_right, Expression::Column("quantity".to_string()));
                        }
                        _ => panic!("Expected addition on left side"),
                    }
                }
                _ => panic!("Expected BinaryOp expression"),
            }
        }
        _ => panic!("Expected UPDATE statement"),
    }
}

#[test]
fn test_parse_mixed_types_arithmetic() {
    // Test mixing integers and reals
    let sql = "UPDATE products SET price = base_price + 10.5";
    let result = parse_sql(sql);
    assert!(result.is_ok());
    let statement = result.unwrap();

    match statement {
        Statement::Update(update) => match &update.assignments[0].value {
            Expression::BinaryOp {
                left,
                operator,
                right,
            } => {
                assert_eq!(**left, Expression::Column("base_price".to_string()));
                assert_eq!(*operator, ArithmeticOperator::Add);
                assert_eq!(**right, Expression::Value(SqlValue::Real(10.5)));
            }
            _ => panic!("Expected BinaryOp expression"),
        },
        _ => panic!("Expected UPDATE statement"),
    }
}

#[test]
fn test_parse_multiple_assignments_with_expressions() {
    let sql =
        "UPDATE products SET price = price * 1.1, discount = price - 10, total = quantity * price";
    let result = parse_sql(sql);
    assert!(result.is_ok());
    let statement = result.unwrap();

    match statement {
        Statement::Update(update) => {
            assert_eq!(update.assignments.len(), 3);

            // First assignment: price = price * 1.1
            match &update.assignments[0].value {
                Expression::BinaryOp {
                    left,
                    operator,
                    right,
                } => {
                    assert_eq!(**left, Expression::Column("price".to_string()));
                    assert_eq!(*operator, ArithmeticOperator::Multiply);
                    assert_eq!(**right, Expression::Value(SqlValue::Real(1.1)));
                }
                _ => panic!("Expected BinaryOp for first assignment"),
            }

            // Second assignment: discount = price - 10
            match &update.assignments[1].value {
                Expression::BinaryOp {
                    left,
                    operator,
                    right,
                } => {
                    assert_eq!(**left, Expression::Column("price".to_string()));
                    assert_eq!(*operator, ArithmeticOperator::Subtract);
                    assert_eq!(**right, Expression::Value(SqlValue::Integer(10)));
                }
                _ => panic!("Expected BinaryOp for second assignment"),
            }

            // Third assignment: total = quantity * price
            match &update.assignments[2].value {
                Expression::BinaryOp {
                    left,
                    operator,
                    right,
                } => {
                    assert_eq!(**left, Expression::Column("quantity".to_string()));
                    assert_eq!(*operator, ArithmeticOperator::Multiply);
                    assert_eq!(**right, Expression::Column("price".to_string()));
                }
                _ => panic!("Expected BinaryOp for third assignment"),
            }
        }
        _ => panic!("Expected UPDATE statement"),
    }
}

#[test]
fn test_parse_literal_values_still_work() {
    // Ensure simple literal assignments still work
    let sql = "UPDATE users SET name = 'John', age = 25, score = 95.5";
    let result = parse_sql(sql);
    assert!(result.is_ok());
    let statement = result.unwrap();

    match statement {
        Statement::Update(update) => {
            assert_eq!(update.assignments.len(), 3);

            // All should be simple Value expressions
            assert_eq!(
                update.assignments[0].value,
                Expression::Value(SqlValue::Text("John".to_string()))
            );
            assert_eq!(
                update.assignments[1].value,
                Expression::Value(SqlValue::Integer(25))
            );
            assert_eq!(
                update.assignments[2].value,
                Expression::Value(SqlValue::Real(95.5))
            );
        }
        _ => panic!("Expected UPDATE statement"),
    }
}