Hi, I have a question about the behavior of the beam built-in DropFields PTransform. If you drop only some fields in a nested row then the other fields in the same nested row are automatically unnested. For example, if a Row originally has columns "A.b", "A.c" and "B.c" and if I use DropField on field "A.b" then the DropField transform will automatically change field "A.c" to "c" in the resulting Row. Meanwhile field "B.c" will remain "B.c". This behavior seems unintuitive. Why should dropping a field require unnesting other fields? Is there any way to avoid this from happening or do I have to write my own PTransform to drop fields without changing the nesting of other fields?
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