Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/359#issuecomment-73013430
I do not quite get what this means now for the input validation.
Assume two classes, `A` and `B`, where `B` is a subclass of `A`.
```java
DataSet<B> data = ...;
data.map(new MapFunction<A, Long>() {
...
});
```
I though that the validation previously checked that the MapFunction's
input parameter is assignable from the data set type. So this is skipped now?
It is not a big deal, I am just wondering why...
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