Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2297
Okay, I think the main source of confusion here is that `EMPTY_STRING` does
actually not refer to an empty string (as specific to the string parser) but to
something like "null", "empty column", or "missing value".
Let's call it something like that and then it actually makes sense to me to
communicate that via an error state. Because it is actually not a regular value
(as an empty string would be).
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