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.
Documentation 
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mod test_helpers {
    include!("../common/test_helpers.rs");
}
use test_helpers::run_with_both_backends;

use tegdb::{Database, MathFunctionsExtension, Result, SqlValue};

#[test]
fn test_abs_function() -> Result<()> {
    run_with_both_backends("test_abs_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Positive integer
        let result = db.query("SELECT ABS(5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(5));

        // Negative integer
        let result = db.query("SELECT ABS(-5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(5));

        // Zero
        let result = db.query("SELECT ABS(0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // Positive real
        let result = db.query("SELECT ABS(2.5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(2.5));

        // Negative real
        let result = db.query("SELECT ABS(-2.5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(2.5));

        // NULL handling
        let result = db.query("SELECT ABS(NULL)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_ceil_function() -> Result<()> {
    run_with_both_backends("test_ceil_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Positive decimal
        let result = db.query("SELECT CEIL(3.7)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(4));

        // Negative decimal
        let result = db.query("SELECT CEIL(-3.7)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(-3));

        // Already integer
        let result = db.query("SELECT CEIL(5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(5));

        // Zero
        let result = db.query("SELECT CEIL(0.0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // NULL handling
        let result = db.query("SELECT CEIL(NULL)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_floor_function() -> Result<()> {
    run_with_both_backends("test_floor_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Positive decimal
        let result = db.query("SELECT FLOOR(3.7)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(3));

        // Negative decimal
        let result = db.query("SELECT FLOOR(-3.7)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(-4));

        // Already integer
        let result = db.query("SELECT FLOOR(5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(5));

        // Zero
        let result = db.query("SELECT FLOOR(0.0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // NULL handling
        let result = db.query("SELECT FLOOR(NULL)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_round_function() -> Result<()> {
    run_with_both_backends("test_round_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Round to 0 decimals
        let result = db.query("SELECT ROUND(3.7, 0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(4.0));

        // Round to 1 decimal
        let result = db.query("SELECT ROUND(3.75, 1)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(3.8));

        // Round to 2 decimals
        let result = db.query("SELECT ROUND(2.34567, 2)")?;
        if let SqlValue::Real(rounded) = result.rows()[0][0] {
            assert!((rounded - 2.35).abs() < 0.001);
        } else {
            panic!("Expected Real result");
        }

        // Round up
        let result = db.query("SELECT ROUND(3.5, 0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(4.0));

        // Round down
        let result = db.query("SELECT ROUND(3.4, 0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(3.0));

        // Negative number
        let result = db.query("SELECT ROUND(-3.5, 0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(-4.0));

        // NULL handling
        let result = db.query("SELECT ROUND(NULL, 2)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_sqrt_function() -> Result<()> {
    run_with_both_backends("test_sqrt_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Perfect square
        let result = db.query("SELECT SQRT(16)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(4.0));

        // Another perfect square
        let result = db.query("SELECT SQRT(144)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(12.0));

        // Decimal
        let result = db.query("SELECT SQRT(2.25)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(1.5));

        // Zero
        let result = db.query("SELECT SQRT(0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(0.0));

        // One
        let result = db.query("SELECT SQRT(1)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(1.0));

        // Negative number should error
        let result = db.query("SELECT SQRT(-1)");
        assert!(result.is_err());

        // NULL handling
        let result = db.query("SELECT SQRT(NULL)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_pow_function() -> Result<()> {
    run_with_both_backends("test_pow_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Positive exponent
        let result = db.query("SELECT POW(2, 3)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(8.0));

        // Zero exponent
        let result = db.query("SELECT POW(5, 0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(1.0));

        // One exponent
        let result = db.query("SELECT POW(5, 1)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(5.0));

        // Negative exponent
        let result = db.query("SELECT POW(2, -2)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(0.25));

        // Base zero
        let result = db.query("SELECT POW(0, 5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(0.0));

        // Decimal base
        let result = db.query("SELECT POW(2.5, 2)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(6.25));

        // NULL handling
        let result = db.query("SELECT POW(NULL, 2)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_mod_function() -> Result<()> {
    run_with_both_backends("test_mod_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Basic modulo
        let result = db.query("SELECT MOD(10, 3)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(1));

        // Even division
        let result = db.query("SELECT MOD(10, 5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // Larger number
        let result = db.query("SELECT MOD(17, 5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(2));

        // Negative dividend
        let result = db.query("SELECT MOD(-10, 3)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(-1));

        // Real numbers
        let result = db.query("SELECT MOD(10.5, 3.2)")?;
        // Result should be approximately 0.9 (implementation dependent)
        if let SqlValue::Real(r) = result.rows()[0][0] {
            assert!(r > 0.8 && r < 1.0);
        } else {
            panic!("Expected Real result");
        }

        // Zero divisor should error
        let result = db.query("SELECT MOD(10, 0)");
        assert!(result.is_err());

        // NULL handling
        let result = db.query("SELECT MOD(NULL, 3)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_sign_function() -> Result<()> {
    run_with_both_backends("test_sign_function", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Positive integer
        let result = db.query("SELECT SIGN(5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(1));

        // Negative integer
        let result = db.query("SELECT SIGN(-5)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(-1));

        // Zero
        let result = db.query("SELECT SIGN(0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // Positive real
        let result = db.query("SELECT SIGN(3.7)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(1));

        // Negative real
        let result = db.query("SELECT SIGN(-3.7)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(-1));

        // Zero real
        let result = db.query("SELECT SIGN(0.0)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // NULL handling
        let result = db.query("SELECT SIGN(NULL)")?;
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    })
}

#[test]
fn test_math_functions_in_table_queries() -> Result<()> {
    run_with_both_backends("test_math_functions_in_table_queries", |db_path| {
        let mut db = Database::open(db_path)?;
        db.register_extension(Box::new(MathFunctionsExtension))?;

        // Create table with numeric data
        db.execute("CREATE TABLE products (id INTEGER PRIMARY KEY, price REAL, quantity INTEGER)")?;
        db.execute("INSERT INTO products (id, price, quantity) VALUES (1, 19.99, 5), (2, -10.50, 3), (3, 0.0, 0)")?;

        // Use ABS in SELECT
        let result = db.query("SELECT ABS(price) FROM products WHERE id = 2")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(10.50));

        // Use functions in WHERE clause
        let result = db.query("SELECT id FROM products WHERE ABS(price) > 10")?;
        assert_eq!(result.len(), 2);

        // Use CEIL in SELECT
        let result = db.query("SELECT CEIL(price) FROM products WHERE id = 1")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(20));

        // Use FLOOR in SELECT
        let result = db.query("SELECT FLOOR(price) FROM products WHERE id = 1")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(19));

        // Use ROUND in SELECT
        let result = db.query("SELECT ROUND(price, 1) FROM products WHERE id = 1")?;
        assert_eq!(result.rows()[0][0], SqlValue::Real(20.0));

        // Use SIGN in SELECT
        let result = db.query("SELECT SIGN(price) FROM products WHERE id = 2")?;
        assert_eq!(result.rows()[0][0], SqlValue::Integer(-1));

        Ok(())
    })
}