Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12067#issuecomment-203916051
This reimplement works, but is inefficient, as the subexpression
elimination is not supported in `TungstenAggregate`'s whole stage codegen. cc
@davies , how hard is it to support subexpression elimination there? I took a
quick look but need more time to get familiar with the whole stage codegen
framework first...
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