Merge #385

385: Fix potential overflow in MergeJoinBy::size_hint r=jswrenn a=andrewhickman



Co-authored-by: Andrew Hickman <andrew.hickman1@sky.com>

src/merge_join.rs

@@ -78,7 +78,7 @@ impl<I, J, F> Iterator for MergeJoinBy<I, J, F>
         let lower = ::std::cmp::max(a_lower, b_lower);
 
         let upper = match (a_upper, b_upper) {
-            (Some(x), Some(y)) => Some(x + y),
+            (Some(x), Some(y)) => x.checked_add(y),
             _ => None,
         };