Github user gczsjdy commented on the issue:
https://github.com/apache/spark/pull/19755
I can't find a way to distinguish `reused` and `unreused` subquery. For
example, in the `ReuseSubquery` rule, after seeing the 1st SubqueryExec(with
`unreused` in name), it's buffered. When the rule sees the 2nd `SubqueryExec`,
it will let the 2nd `PlanExpression` holds the same SubqueryExec buffered. This
is the process of reuse, but it makes us not able to change the physical plan's
name to indicate it's reused. I thought about add a var state in
`SubqueryExec`, but it seems few physical plans do that.
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