Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8292#issuecomment-164951114
I can see how this patch can improve performance; currently we may end up
creating a `SerializerInstance` per partition, which could be expensive if
there are thousands of partitions. However, I don't know how much performance
this could save in practice. If it doesn't end up buying us much then the extra
complexity here is not worth it.
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