Add SQL array::group() function

lib/src/fnc/array.rs

@@ -51,6 +51,13 @@ pub fn flatten((arg,): (Value,)) -> Result<Value, Error> {
 	})
 }
 
+pub fn group((arg,): (Value,)) -> Result<Value, Error> {
+	Ok(match arg {
+		Value::Array(v) => v.uniq().flatten().into(),
+		_ => Value::None,
+	})
+}
+
 pub fn insert((array, value, index): (Value, Value, Option<Value>)) -> Result<Value, Error> {
 	match (array, index) {
 		(Value::Array(mut v), Some(Value::Number(i))) => {

lib/src/fnc/mod.rs

@@ -66,6 +66,7 @@ pub fn synchronous(ctx: &Context<'_>, name: &str, args: Vec<Value>) -> Result<Va
 		"array::difference" => array::difference,
 		"array::distinct" => array::distinct,
 		"array::flatten" => array::flatten,
+		"array::group" => array::group,
 		"array::insert" => array::insert,
 		"array::intersect" => array::intersect,
 		"array::len" => array::len,

lib/src/sql/function.rs

@@ -79,6 +79,7 @@ impl Function {
 		match self {
 			Self::Normal(f, _) if f == "array::concat" => true,
 			Self::Normal(f, _) if f == "array::distinct" => true,
+			Self::Normal(f, _) if f == "array::group" => true,
 			Self::Normal(f, _) if f == "array::union" => true,
 			Self::Normal(f, _) if f == "count" => true,
 			Self::Normal(f, _) if f == "math::bottom" => true,
@@ -241,6 +242,7 @@ fn function_array(i: &str) -> IResult<&str, &str> {
 		tag("array::difference"),
 		tag("array::distinct"),
 		tag("array::flatten"),
+		tag("array::group"),
 		tag("array::insert"),
 		tag("array::intersect"),
 		tag("array::len"),