Github user davies commented on the pull request: https://github.com/apache/spark/pull/7059#issuecomment-116109310 @cloud-fan Thanks for looking into this, We have some offline discussion last week, because of the data source API, we have to make InternalRow can be casted into Row for performance, if we don't change the data source API much. So, we still need to make InternalRow as child of Row, so abort the #6869. I like the idea of removing BaseMutableRow, will merging these into #7003, if you don't mind. Just came back from retreat, will update that PR soon.
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