Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/9218#issuecomment-151379530
@sun-rui That's a great point, `coltypes()` as its signature is defined,
would only return a list of simple types.
But how would one create a DataFrame with complex type from R? I tried a
bit and couldn't get it to work. Either I get `Unsupported type for DataFrame:
factor` or `unexpected type: environment`
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