Github user gatorsmile commented on the issue:
    Here, I am talking about the black box testing. If you add the new 
capability to any external function, you should add it in the test cases. This 
is very fundamental when we developing enterprise-level software. Note, Spark 
is an infrastructure software, not an application software.
    The quality of Spark depends on the test case coverage. The code base of 
Spark SQL is rapidly increasing. We keep refactoring it. Even if your code does 
not have any bug, it does not mean the future code changes will not break your 
logics. Thus, we should do our best to improve the test case coverage in each 

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