Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/12904#issuecomment-218633000
@andrewor14 Here it seems it is concluded that `""` is a string and a empty
string is `null`. Because `""` is a legitimate string, this can be a field name
whereas a empty string might not be able (`null`). Although we cannot query to
empty strings, we can still see when it performs `show()`.
It seems anyway it is decided that empty strings will be unnamed columns
with prefix (`_c`). Do you think this can be generalized to data sources and
Spark SQL including fields name with spaces (eg. `" "`)?
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