Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3429#issuecomment-66391400
@marmbrus I've updated the scala doc a little bit, I know that's quite
complicated now, but we need to make thing right (to integrated with Hive UDFs
seamlessly), since bugs like #2802 is depended on this.
I will make another PR to refactor / improve the performance described at
https://github.com/apache/spark/pull/3429/files#diff-f88c3e731fcb17b1323b778807c35b38R167
once this PR merged.
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