Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/4460#issuecomment-75461553
> I went to add AttributeGroup, but then I can't figure out how this isn't
already covered by Attribute's dimension? It's 1 for a scalar, >1 for a
vector-valued feature. That's all that's different from a metadata perspective,
right?
If we want to have attributes parallel to arbitrary nestings of SQL types,
then it will need to be changed. I'm not clear right now what the consensus is
on supporting nested schema.
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