Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20476
@rdblue To be honest, the push-down solution in the current code base is
not well designed. We got many feedbacks from the community (e.g., SAP and IBM
Research). One proposed a bottom-up solution and another proposed a top-down
solution. No solution is perfect.
In this release, we want to introduce a new solution for enhancing the
capability of operator push-down. The new code path is not stable yet. We are
welcoming the community to try it and provide more feedbacks about it.
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