Github user Xpray commented on the issue:
https://github.com/apache/flink/pull/5613
@twalthr yes that your PR have solved the urgent ones.
I have cases with huge unboxing code but we can still split it in this way.
As for large section codes of one field we may have to make the local
variables to member field and split, we might finally use sub classes to avoid
JVM's limitation.---
