Github user lincoln-lil commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3733#discussion_r111957812
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/RowSerializer.java
 ---
    @@ -171,6 +181,7 @@ public Row deserialize(DataInputView source) throws 
IOException {
                                result.setField(i, 
fieldSerializers[i].deserialize(source));
                        }
                }
    +           result.command = (Command) 
commandSerializer.deserialize(source);
    --- End diff --
    
    should we use the method with reuse variable ?
    T deserialize(T reuse, DataInputView source)
    though it doesn't perform reusing actually


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