Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/801#issuecomment-110653949
If I'm not mistaken then something like
```
int log2(long value){
if(value & 0xffffffff00000000 > 0) {
64 - Integer.numberOfLeadingZeros((int)(value >> 32))
} else {
32 - Integer.numberOfLeadingZeros((int)value)
}
}
```
should do the trick.
For the generalization I think something like `dataSet.zipWithID()` with
```
class DataSet<T> {
public DataSet<Tuple2<Long, T>> zipWithID() {}
}
```
would be nice. But we should discuss it on the mailing list whether we want
this to be part of the API or not. For the beginning, it could be added to some
kind of utils class.
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