Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15608
I guess you meant when the options, for example,
`DataFrameReader.extraOptions` turns into `Properties` when we call JDBC APIs.
In this case, `Properties` always has a higher precedence and will overwrite
`DataFrameReader.extraOptions`[1] and exclude Spark internal options[2].
[1]https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala#L235
[2]https://github.com/apache/spark/blob/0c0ad436ad909364915b910867d08262c62bc95d/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCOptions.scala#L43
(BTW, it seems throwing `NullPointException` when we call `setProperty` and
the key is `null`)
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