Github user davies commented on the pull request:
https://github.com/apache/spark/pull/9203#issuecomment-150044370
@JoshRosen If we only scan the cached string and access it (without adding
a ConvertToUnsafe), this could be a little bit slower, because we copy the
bytes into UnsafeRow now. For the UTF8String object, we still will create it
anyway, before this patch, we create it in ColumnAccessor, after this patch, we
create in UnsafeRow.getUTF8String() (we could re-use that actually).
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