Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9658#issuecomment-157461363
> But it doesn't cover nested fields, e.g. an array field of JSON/BSON
elements.
That is an unfortunate limitation of our metadata, but it does seem like it
could be worked around. Though that said this is a minor concern.
> "support for reading these types as strings"
I'm just saying thats what this patch does. It just reads them in as a
text/binary string of opaque bytes.
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