Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1045#issuecomment-134108201
The PR seems to solve the problem. However, I'm wondering why the
`InvalidTypesException` is an unchecked exception. I think that this is the
actual culprit and should be fixed. Moreover, according to: Joshua Bloch in
"Effective Java"
> Use checked exceptions for recoverable conditions and runtime exceptions
for programming errors (Item 58 in 2nd edition)
In our case we can recover from it by returning a `MissingTypeInformation`.
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