Github user rxin commented on the issue:
https://github.com/apache/spark/pull/17770
I'm actually wondering if we should just introduce a variant of transform
that takes a stop condition, e.g.
```
def transform(stopCondition: BaseType => Boolean)(rule:
PartialFunction[BaseType, BaseType])
```
and then in analyzer we can use
```
def transform(_.resolved) {
case ...
}
```
I worry adding this random node everywhere will make the plan look ugly and
break certain assumptions we have somewhere.
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