Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/15608
re: JIRA - I don't mind one way or the other - both proposals sound good to
me.
> currently we don't make this failed when unused arbitrary options are
given (e.g. option("abc", "1")), so, it'd be okay to not make this failed. but
of course this is not a strong opinion.
a valid point. does it work properly when the Spark properties are set into
a Java Properties class?
https://docs.oracle.com/javase/7/docs/api/java/util/Properties.html#setProperty(java.lang.String,%20java.lang.String)
It seems if the key is `""` or `null` then it would overwrite?
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