Github user yijieshen commented on the pull request:
https://github.com/apache/spark/pull/6881#issuecomment-113145106
I prefer to keep the origin column names in the newly created struct, since
I think it's more meaningful than `col1, col2, col3`, and we could just leave
the unnamed columns to `col1, col2 ...`, which is also compatible with Hive's
semantic.
I've also made related changes in #6874 to loosen parameter requirements of
[`struct`](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L723)
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