Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/22899
To be honest, we might still need to revisit it since it is still very
confusing to the developer which one they should use, top-down? or bottom-up?
The current use case for top-down is majorly for resolving the higher order
functions.
This PR at least improves the description. We might need to combine them in
the future.
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