Github user kaspersorensen commented on the issue:
https://github.com/apache/metamodel/pull/148
Ah yes you're right. That should give a good boost in performance in deed!
Functionally the code looks good to me. I am not 100% sure about what I
think about the JoinHelper class. It's only made up of static methods which
means that all it's methods could just as well be directly part of
MetaModelHelper. And MetaModelHelper is IMO already a kind of a junkdrawer of
static methods, so I don't think I want another :-) On the other hand,
something that would maybe be nice is if you made the JoinHelper class
non-static so that you would instantiate it like this:
```
DataSetJoiner joiner = new DataSetJoiner(fromItemWithJoin);
DataSet dataSet = joiner.join(dataSets);
```
(or something quite similar to this)
I think then we would have a class that's quite nicely built and scoped
such that it cannot be used out of context (statically). So that would be my
suggestion for a more pretty design :-)
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