Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2807
I think we need to go through these changes one by one.
In many situations, field being null indicates an error. These situations
now silently do nothing, rather than at least reporting an error (even if in
the form of a null pointer exception). That would make some failed programs
appear succeeded.
Preventing exceptions is not always correct - if a situation is invalid, it
should fail with an exception.
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