Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7392#issuecomment-121687298
OK I'm merging this.
@davies is right - we shouldn't need expressions with mutable state in
order by. As a matter of fact, expressions with mutable state should mostly be
considered nondeterministic, and in that case, we should always materialize
their value before we do sorting, rather than computing the value in sorting.
Let's fix that in a separate patch, since it involves more than just
removing codegen mutable state from ordering.
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