AngersZhuuuu commented on pull request #28496:
URL: https://github.com/apache/spark/pull/28496#issuecomment-626538335
> fyi, tags could be copied along with makeCopy @AngersZhuuuu
thanks a lot, it's not clear to me that which one will be retained and which
one will be reset in `makeCopy`, I will check the SourceCode detail.
And for
```
private lazy val sum = AttributeReference("sum", sumDataType)()
```
In `Sum`, it will be change in PlanSubqueries too, and result in different
ExprId,
Do we need to handle this ?
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