Github user rxin commented on the issue:
https://github.com/apache/spark/pull/14847
So I'd recommend closing this for now. @viirya you are welcome to work on
it still, but it should:
1. Be obvious in explain (e.g. through an operator) that this behavior
exists.
2. Works for code gen.
3. Modular logic, ideally determined by the query planner.
4. Correct.
One thing we need to decide is whether the final improvement is worth the
complexity.
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