Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/12904#issuecomment-218680978
After the discussion https://github.com/apache/spark/pull/13041, I think
the field below:
```scala
StructField("", StringType, nullable =true)
```
should be renamed to a field having prefix `_c`.
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