Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/2638
I REALLY didn't want to have to do this explicit Oracle stuff in the
generic code, but the other options I tried weren't viable. I tried isolating
the SQL type conversion to the DatabaseAdapters, but ExecuteSQL uses JdbcCommon
and does not use DatabaseAdapters, so the problem would still exist. I also
tried calling getTimestamp() in the default handling block (before attempting
to store a String) but that is really brittle since other drivers may or may
not handle getTimestamp() in a manner we could rely on. This is a simple
straightforward (but dirty) fix.
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