[GitHub] [pulsar] sijie opened a new issue #4110: Function should support `Message`

[GitBox <gi...@apache.org>]

sijie opened a new issue #4110: Function should support `Message<T>`
URL: https://github.com/apache/pulsar/issues/4110
 
 
   **Is your feature request related to a problem? Please describe.**
   
   The message metadata is lost in source/function. People can not use these information for their computation. 
   
   **Describe the solution you'd like**
   
   Similar as what was discussed in #4093, we should support using `Message<T>` as the input for a source or a function.
   
   ```
   public class MessageFunction implements Function<Message<String>, String>> {
   ...
   }
   ```
   
   **Describe alternatives you've considered**
   
   N/A
   

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