Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/7631#issuecomment-131929181
There is no particular reason that `InsertIntoTable` should have the same
schema as its child. Initially I was thinking that you might want to chain the
insert with other operations. However, [the current
implementation(https://github.com/apache/spark/blob/master/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala#L257)
doesn't take advantage of this possibility so I'd propose we just make its
output empty so that we can merge this patch.
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