Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19082
The relation is very clear. Let me copy what I said above
> Just imagine we have two nodes, we want to do a horizontal/ring cut.
Basically, in this scenario, horizontal/ring cutting means whether we do a
whole-stage codegen or not.
After horizontal/ring cutting, each operator will be in a single blocking
loop. That means, whole-stage codegen is off.
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