Github user eyalfa commented on the issue:
https://github.com/apache/spark/pull/14444
@hvanhovell , I'm currently trying your approach of testing `ne.resolved`
prior to accessing `ne.name`.
tests are running as I write here, but a quick dive into the
`NamedExpression` hierarchy revealed some more cases (other than `Star`) where
the names are not available prior to analysis, i.e.`UnresolvedAlias` and
`MultiAlias`, there's also `UnresolvedAttribute` which isn't resolved but its
name is always available (doesn't throw).
even though I've tried I couldn't come up with a use case that combines
these expressions with `CreateStruct`, I'd appreciate if any of you guys can
shed some light on these classes, especially `UnresolvedAlias`. I'm a bit
worried about this one as I suspect `CreateStruct.apply` might encounter one,
looking at `Analyzer` shows that `ResolveAliases` is executed after
`ResolveFunctions` so I guess my concern is at least theoretically possible.
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