Github user marmbrus commented on the pull request:

    https://github.com/apache/spark/pull/9391#issuecomment-153328193
  
    Thanks for fixing this.
    
    I think the best solution might be for us to `unbind` at the same time that 
we `resolve`.  That way we always have `AttributeReferences` in the encoder 
that is held by a `Dataset`.  Then we can bind at the last minute, similar to 
how we handle it with other expressions.  However, I think we should get this 
patch and test case in for now since it works.


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