Github user tzolov commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/167#issuecomment-129441241
@randerzander, while working on the `postgresql` and `geode` i had to
consider few details (credit to @martin-g for pointing them out) that you can
find helpful as well .
* You may want to define a maxResultRow to restrict the max number of
result displayed or you risk to kill your zeppelin. In couple of occasions I've
forgotten to set sql LIMIT and managed to freeze the front end.
* As a safeguard you can call the close() in your open method before
opening the connection
* For testing use proper Mockito and MockRunner
[PostgreSqlInterpreterTest.java](https://github.com/apache/incubator-zeppelin/blob/master/postgresql/src/test/java/org/apache/zeppelin/postgresql/PostgreSqlInterpreterTest.java)
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