rdblue commented on a change in pull request #503: Fix snapshot summary data 
for appended manifests.
URL: https://github.com/apache/incubator-iceberg/pull/503#discussion_r329328080
 
 

 ##########
 File path: core/src/main/java/org/apache/iceberg/SnapshotProducer.java
 ##########
 @@ -366,16 +366,18 @@ private static void 
updateTotal(ImmutableMap.Builder<String, String> summaryBuil
         long newTotal = Long.parseLong(totalStr);
 
         String addedStr = currentSummary.get(addedProperty);
-        if (addedStr != null) {
+        if (newTotal > 0 && addedStr != null) {
           newTotal += Long.parseLong(addedStr);
         }
 
         String deletedStr = currentSummary.get(deletedProperty);
-        if (deletedStr != null) {
+        if (newTotal > 0 &&   deletedStr != null) {
 
 Review comment:
   Fixed. Thanks!

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