Github user janewangfb commented on the issue:
https://github.com/apache/spark/pull/18023
@gatorsmile regarding
> Could you add some test cases in the other parts of the query? For
example, group by clauses.
I added some tests for aggreation. But for group by, we cannot have regex
there. group by requires the fields to be orderable. As hive states and our
previous comments, we should only support regex in SELECT.
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