Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/14444
This happens if you don't provide an alias for the expression.
To me this is not really a backwards compatibility issue. Yes, the default
alias is changed, but think of the use case for this. What user is going to use
the name `struct(a, b, ...)` in any of his queries? So to me this is not really
a backwards compatibility issue. I feel that we should press ahead and update
the test.
If you feel strongly about it, lets just add an `anonymous` flag to the
`CreateNamedStruct`. I think that adding common parent or trait is way to much
complexity for changing the name.
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