Github user maryannxue commented on the issue:
https://github.com/apache/spark/pull/21753
@maropu It's not a bug. It works as I specified in my original PR, and you
can also refer to
https://docs.oracle.com/database/121/SQLRF/img_text/pivot_clause.htm, which
only allows a form of "agg_func(expr)". `ceil(sum(...)` is an aggregate
expression, but not in that form.
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