Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/15432 Not urgent but in my experience such PR have been being hold. So, I am trying to fix the problem specified in the JIRA only rather than fixing others together. @srowen said "I'm not even sure that's a bug.." but "... reasonable to try to follow it.". At least, all the implementations of DB2, MySQL and PostgreSQL do not throw an exception but it defines its own behaviour.
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