Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/8587#issuecomment-149650308
@viirya We compared the performance of declarative approach vs imperative
in https://issues.apache.org/jira/browse/SPARK-10953. The declarative approach
is much slower because of extra code and lack of common sub-expression
elimination. If you still keep the original code, could you revert this PR to
your first commit? Also cc @rxin for this performance issue.
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