Implement RAND() ordering in ORDER BY clauses

lib/src/dbs/iterator.rs

@@ -20,6 +20,7 @@ use crate::sql::statements::update::UpdateStatement;
 use crate::sql::table::Table;
 use crate::sql::thing::Thing;
 use crate::sql::value::Value;
+use rand::Rng;
 use std::cmp::Ordering;
 use std::collections::BTreeMap;
 use std::mem;
@@ -288,10 +289,18 @@ impl Iterator {
 				// Loop over each order clause
 				for order in orders.iter() {
 					// Reverse the ordering if DESC
-					let o = match order.direction {
+					let o = match order.random {
+						true => {
+							let a = rand::random::<f64>();
+							let b = rand::random::<f64>();
+							a.partial_cmp(&b)
+						}
+						false => match order.direction {
 							true => a.compare(b, &order.order),
 							false => b.compare(a, &order.order),
+						},
 					};
+					//
 					match o {
 						Some(Ordering::Greater) => return Ordering::Greater,
 						Some(Ordering::Equal) => continue,