From 7dceb102a77efeac6121fb86f1bf7fc28744e646 Mon Sep 17 00:00:00 2001
From: Ziyang Hu <hu.ziyang@cantab.net>
Date: Sat, 23 Apr 2022 00:43:12 +0800
Subject: [PATCH] hashing

---
 src/relation/tuple.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/relation/tuple.rs b/src/relation/tuple.rs
index c4a9839e..643c4d43 100644
--- a/src/relation/tuple.rs
+++ b/src/relation/tuple.rs
@@ -1,6 +1,7 @@
 use std::borrow::{Cow};
 use std::cell::RefCell;
 use std::collections::BTreeMap;
+use std::hash::{Hash, Hasher};
 use uuid::Uuid;
 use crate::relation::value::{Tag, Value};
 
@@ -353,6 +354,12 @@ impl<T: AsRef<[u8]>> PartialEq for Tuple<T> {
     }
 }
 
+impl <T: AsRef<[u8]>> Hash for Tuple<T> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.data.as_ref().hash(state);
+    }
+}
+
 impl<T: AsRef<[u8]>> Eq for Tuple<T> {}