Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/5491
Thanks for the review @xccui. I agree that a pure string-based format would
be helpful as well. For this we can simply use a string serialization schema
later. In a long-term view we will need to implement scalar functions that can
handle a json string and allow accessing such a string as type-safe as
possible. ---
