Github user viirya commented on the issue:
https://github.com/apache/spark/pull/17935
Sorry, to be accurate, for the syntax of derived table in SQL, the
databases I listed above are commonly seen in the market, and they don't
support it without alias name. SQL 2003 grammar also doesn't support it.
Based on the above, I'd tend to think that derived table without alias name
is not a widely used syntax among database users.
But we know there's exception such as CockroachDB, as @JoshRosen pointed
out.
This isn't an argument to object reverting, rather just a reference for you
to decide on this issue.
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