Github user sihuazhou commented on a diff in the pull request:
    --- Diff: 
    @@ -61,8 +61,9 @@
         *                 over it keys are not supported.
         * @param state State variable for which existing keys will be returned.
         * @param namespace Namespace for which existing keys will be returned.
    +    * @param namespaceSerializer the serializer for the namespace.
    -   <N> Stream<K> getKeys(String state, N namespace);
    +   <N> Stream<K> getKeys(String state, N namespace, TypeSerializer<N> 
    --- End diff --
    Aha, I also noticed that `RegisteredKeyedBackendStateMetaInfo` contains the 
namespace serializer. But there is one thing that confuses me, I found that it 
looks like one `ColumnFamilyHandle` can correspond to multiple namespace 
serializer but I am not sure about this, so I introduced this additional 
parameter. Am I misunderstanding something? Can one `ColumnFamilyHandle` only 
correspond to one namespace serializer?


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