title: Custom partition assignment in Kafka JDBC connector
body: <p>I have a use case where i need to write a custom logic to assign the partition based on certain key parameters from the message. I did some research on this and found that kafka transformation supports to override some methods in Transformation  interface but i was unable to do some example code in git hub or somewhere. can someone please share the sample code or git hub link to do the custom partition assignment in kafka JDBC source connector?</p>
  
  <p>Thanks in advance!.</p>