Derive ord/eq traits for Product's columnar variant (#630)

Signed-off-by: Moritz Hoffmann <antiguru@gmail.com>

Author: antiguru

timely/src/order.rs

@@ -75,6 +75,7 @@ mod product {
     /// We use `Product` rather than `(TOuter, TInner)` so that we can derive our own `PartialOrder`,
     /// because Rust just uses the lexicographic total order.
     #[derive(Copy, Clone, Hash, Eq, PartialEq, Default, Ord, PartialOrd, Serialize, Deserialize, Columnar)]
+    #[columnar(derive(Eq, PartialEq, Ord, PartialOrd))]
     pub struct Product<TOuter, TInner> {
         /// Outer timestamp.
         pub outer: TOuter,