chenjunjiedada commented on a change in pull request #588: Add sequential 
number prepare for supporting row level delete (WIP)
URL: https://github.com/apache/incubator-iceberg/pull/588#discussion_r350216704
 
 

 ##########
 File path: core/src/main/java/org/apache/iceberg/BaseSnapshot.java
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 @@ -185,6 +211,15 @@ private void cacheChanges() {
     this.cachedDeletes = deletes.build();
   }
 
+  @Override
+  public Long sequenceNumber() {
 
 Review comment:
   That's an initial implementation that needs some discussion.  For example, 
we can generate sequence numbers from the timestamp for existing snapshots.

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