Add integration tests for the built-in SQL functions (#1893)

lib/src/fnc/mod.rs

@@ -178,6 +178,7 @@ pub fn synchronous(ctx: &Context<'_>, name: &str, args: Vec<Value>) -> Result<Va
 		"parse::url::query" => parse::url::query,
 		"parse::url::scheme" => parse::url::scheme,
 		//
+		"rand" => rand::rand,
 		"rand::bool" => rand::bool,
 		"rand::enum" => rand::r#enum,
 		"rand::float" => rand::float,
@@ -189,7 +190,6 @@ pub fn synchronous(ctx: &Context<'_>, name: &str, args: Vec<Value>) -> Result<Va
 		"rand::uuid::v4" => rand::uuid::v4,
 		"rand::uuid::v7" => rand::uuid::v7,
 		"rand::uuid" => rand::uuid,
-		"rand" => rand::rand,
 		//
 		"session::db" => session::db(ctx),
 		"session::id" => session::id(ctx),

lib/src/fnc/time.rs

@@ -91,8 +91,8 @@ pub fn minute((val,): (Option<Datetime>,)) -> Result<Value, Error> {
 
 pub fn month((val,): (Option<Datetime>,)) -> Result<Value, Error> {
 	Ok(match val {
-		Some(v) => v.minute().into(),
-		None => Datetime::default().minute().into(),
+		Some(v) => v.month().into(),
+		None => Datetime::default().month().into(),
 	})
 }
 

lib/src/fnc/util/math/mean.rs

@@ -6,8 +6,13 @@ pub trait Mean {
 
 impl Mean for Vec<Number> {
 	fn mean(&self) -> Number {
-		let len = Number::from(self.len());
-		let sum = self.iter().sum::<Number>();
-		sum / len
+		match self.len() {
+			0 => Number::NAN,
+			_ => {
+				let len = Number::from(self.len());
+				let sum = self.iter().sum::<Number>();
+				sum / len
+			}
+		}
 	}
 }

lib/src/sql/duration.rs

@@ -20,6 +20,7 @@ static SECONDS_PER_DAY: u64 = 24 * SECONDS_PER_HOUR;
 static SECONDS_PER_HOUR: u64 = 60 * SECONDS_PER_MINUTE;
 static SECONDS_PER_MINUTE: u64 = 60;
 static NANOSECONDS_PER_MILLISECOND: u32 = 1000000;
+static NANOSECONDS_PER_MICROSECOND: u32 = 1000;
 
 pub(crate) const TOKEN: &str = "$surrealdb::private::sql::Duration";
 
@@ -179,6 +180,9 @@ impl fmt::Display for Duration {
 		// Calculate the total millseconds
 		let msec = nano / NANOSECONDS_PER_MILLISECOND;
 		let nano = nano % NANOSECONDS_PER_MILLISECOND;
+		// Calculate the total microseconds
+		let usec = nano / NANOSECONDS_PER_MICROSECOND;
+		let nano = nano % NANOSECONDS_PER_MICROSECOND;
 		// Write the different parts
 		if year > 0 {
 			write!(f, "{year}y")?;
@@ -201,6 +205,9 @@ impl fmt::Display for Duration {
 		if msec > 0 {
 			write!(f, "{msec}ms")?;
 		}
+		if usec > 0 {
+			write!(f, "{usec}µs")?;
+		}
 		if nano > 0 {
 			write!(f, "{nano}ns")?;
 		}

lib/src/sql/number.rs

@@ -179,6 +179,10 @@ impl Number {
 	// Simple number detection
 	// -----------------------------------
 
+	pub fn is_nan(&self) -> bool {
+		matches!(self, Number::Float(v) if v.is_nan())
+	}
+
 	pub fn is_int(&self) -> bool {
 		matches!(self, Number::Int(_))
 	}

lib/src/sql/value/value.rs

@@ -872,6 +872,11 @@ impl Value {
 		matches!(self, Value::Number(Number::Decimal(_)))
 	}
 
+	/// Check if this Value is a Number but is a NAN
+	pub fn is_nan(&self) -> bool {
+		matches!(self, Value::Number(v) if v.is_nan())
+	}
+
 	/// Check if this Value is a Number and is an integer
 	pub fn is_integer(&self) -> bool {
 		matches!(self, Value::Number(v) if v.is_integer())
@@ -1195,6 +1200,16 @@ impl Value {
 		match self {
 			// Allow any boolean value
 			Value::Bool(boolean) => Ok(boolean),
+			// Attempt to convert a string value
+			Value::Strand(ref v) => match v.parse::<bool>() {
+				// The string can be represented as a Float
+				Ok(v) => Ok(v),
+				// Ths string is not a float
+				_ => Err(Error::ConvertTo {
+					from: self,
+					into: "bool".into(),
+				}),
+			},
 			// Anything else raises an error
 			_ => Err(Error::ConvertTo {
 				from: self,