Address comments

Signed-off-by: Yilin Chen <sticnarf@gmail.com>

src/transaction/mod.rs

@@ -28,6 +28,11 @@ mod transaction;
 const PHYSICAL_SHIFT_BITS: i64 = 18;
 const LOGICAL_MASK: i64 = (1 << PHYSICAL_SHIFT_BITS) - 1;
 
+/// A timestamp returned from the timestamp oracle.
+///
+/// The version used in transactions can be converted from a timestamp.
+/// The lower 18 (PHYSICAL_SHIFT_BITS) bits are the logical part of the timestamp.
+/// The higher bits of the version are the physical part of the timestamp.
 #[derive(Eq, PartialEq, Debug, Clone, Copy)]
 pub struct Timestamp {
     pub physical: i64,

src/transaction/requests.rs

@@ -243,10 +243,7 @@ impl KvRequest for kvrpcpb::ResolveLockRequest {
     fn reduce(
         results: BoxStream<'static, Result<Self::Result>>,
     ) -> BoxFuture<'static, Result<Self::Result>> {
-        results
-            .into_future()
-            .map(|(f, _)| f.expect("no results should be impossible"))
-            .boxed()
+        results.try_collect().boxed()
     }
 }