Github user bogdanrdc commented on the issue:
https://github.com/apache/spark/pull/16958
IMO I'd leave it as it is.
The problem with `resolved = false` is that `ResolveAliases` rule will no
longer handle an expression like `UnresolvedAlias(GeneratorOuter(Generator)))`
which in turn will cause `ExtractGenerator` rule to not work.
Otherwise, we could change one of these rules to handle it but seems
cleaner to leave `GeneratorOuter.resolved` as the default which is to check if
children are resolved.
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