Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7402#issuecomment-121503289
@rxin The other two generated projections that return GenericMutableRow or
generated SpecificRow, they both can take UnsafeRow as input,
GenerateMutableProjection already can work with UnsafeRow (updating a
UnsafeRow, but need ObjectPool to support update StringType and BinaryType).
Right now, in order to support var-length objects (String and Binary), we
need to know all of the columns in a row, so it's no trivial to make
GenerateMutableProjection and GenerateProjection to work with UnsafeRow
directly (we can update GenerateProjection to re-use the SpecificRow to reduce
short-term garbage).
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