Make what parser to parse idioms as well (#2243)

lib/src/sql/value/value.rs

@@ -2780,6 +2780,7 @@ pub fn start(i: &str) -> IResult<&str, Value> {
 /// Used in CREATE, UPDATE, and DELETE clauses
 pub fn what(i: &str) -> IResult<&str, Value> {
 	alt((
+		map(idiom::multi, Value::from),
 		map(function, Value::from),
 		map(subquery, Value::from),
 		map(constant, Value::from),

lib/tests/delete.rs

@@ -0,0 +1,26 @@
+mod parse;
+use parse::Parse;
+
+use surrealdb::dbs::Session;
+use surrealdb::err::Error;
+use surrealdb::kvs::Datastore;
+use surrealdb::sql::Value;
+
+#[tokio::test]
+async fn delete_with_idiom_value() -> Result<(), Error> {
+	let sql = "
+    let $person = RETURN CREATE person:bob;
+    DELETE $person.id;
+	";
+	let dbs = Datastore::new("memory").await?;
+	let ses = Session::for_kv().with_ns("test").with_db("test");
+	let res = &mut dbs.execute(sql, &ses, None).await?;
+	assert_eq!(res.len(), 2);
+	//
+	let _ = res.remove(0).result?;
+	//
+	let tmp = res.remove(0).result?;
+	let val = Value::parse("[]");
+	assert_eq!(tmp, val);
+	Ok(())
+}