Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16404
DB2 has such a limit. See the error message `SQL -583`:
http://www.ibm.com/support/knowledgecenter/SSEPGG_10.5.0/com.ibm.db2.luw.messages.sql.doc/doc/msql00583n.html
> The routine (function or method) or expression is defined as
non-deterministic or as having external action. This is not supported in the
context in which it is used. The contexts in which these are not valid are:
> in an expression of a GROUP BY clause
It documents the same workaround:
> Remove the non-deterministic or external action routine or expression
from the GROUP BY clause. If grouping is desired on a column of the result that
is based on a non-deterministic or external action routine or expression use a
nested table expression or a common table expression to first provide a result
table with the expression as a column of the result.
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