Github user shiv4nsh commented on the issue:
https://github.com/apache/spark/pull/15944
Actually I was looking into the code and hence found Seq("commonFeild") in
the code , but it was not making much sense as to why one should make it a
sequence if only one column name is needed hence I thought this alias can be
added. In my opinion , in a larger code base `"commonField"` can be taken as a
little more cleaner than `Seq("commonField")` and hence the improvement !
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