Github user ijokarumawak commented on the issue:
https://github.com/apache/nifi/pull/3159
LGTM +1. I was able to confirm the expected benefit of using an empty
demarcator string to combine multiple Avro formatted Kafka messages into a
single FlowFile. Thanks @pvillard31!
For those who want to use this improvement with older NiFi versions, using
EL `${empty}` can mimic the non-empty validation and result the same effect .
This assumes there's no variable named `empty`, the EL evaluation result will
be an empty string while this is a valid configuration since it's not an empty
property value.
---
