Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/12601#issuecomment-213382065
BTW, it looks it is pretty general that `Properties` just works like
`HashMap[String, String]` in most cases.
Firstly, I just checked [java.sql.Driver
API](https://docs.oracle.com/javase/7/docs/api/java/sql/Driver.html) and it
describes the argument for `Properties` as below:
>info - a list of arbitrary string tag/value pairs as connection arguments.
Normally at least a "user" and "password" property should be included.
Secondly, apparently Spark uses the methods below in `Properties`.
```java
public Set<String> stringPropertyNames()
public String getProperty(String key, String defaultValue)
public void store(OutputStream out, String comments) // This uses convert
for keys and values internally.
public synchronized Object setProperty(String key, String value)
```
It looks they uses `String` for keys and values.
So, I think it might be OK to support `write.format("jdbc")`. I believe
`read.format("jdbc")` is already being supported and I could not find JIRA
issues about the problem for giving some options for `read.format("jdbc")`.
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