Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/7197#issuecomment-119094769
@davies @JoshRosen I have one question for expression in general, since all
of the intermediate objects are immutable in expression evaluation, we have to
keep creating new object like `UTF8String` instances for every iteration.
Probably it causes big overhead in a deep expression tree. Will that be
possible to make the mutable object instead? Just like the
`org.apache.hadoop.io.Writable`, so we can reuse the intermediate object.
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