Github user chenghao-intel commented on the pull request:

    https://github.com/apache/spark/pull/5497#issuecomment-92514199
  
    @yhuai this is a really cool improvement, definitely will improve the 
performance a lot. I have some of the comments about the future improvement(of 
course we can leave it for future), the most of the concern is using the 
`Seq[Expression]` probably better for `Array[DataType]` in constructing the 
Serializer, as we can optimize it for not serializing the `Literal` stuff.


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