HeartSaVioR edited a comment on issue #25696: [SPARK-28996][SQL] Add tests 
regarding username of HiveClient
URL: https://github.com/apache/spark/pull/25696#issuecomment-529607601
 
 
   There're some reasons to make this be separated PR:
   
   1. I suggested adding UT in #23952 before, and the author didn't follow the 
suggestion so I had to put my own effort to deal with this. If I needed to 
raise the PR against author's fork, I should also persuade to merge it to 
reflect the PR, which seems to be unnecessary effort (and in my personal 
experience it has been progressed slowly on coordinating with other 
contributors... I've been also waiting for other contributor in #25577 to 
coordinate). If this patch got merged before, #23952 will make new tests be 
broken so #23952 is forced to apply the change. If this patch got merged after, 
I'm open to apply the change.
   2. This patch can be independent with #23952, as the new tests are passing 
with current behavior. This patch is still valuable without #23952 as we should 
have to have tests to prevent changing behavior unintentionally. We didn't 
notice the behavioral change in latest change of 
[SPARK-22846](http://issues.apache.org/jira/browse/SPARK-22846) - we thought it 
fixed NPE but it also changed the behavior. This is a non-trivial issue.
   3. Minor, but authorship issue. IMHO I'm not sure who is the right main 
author of merged PR, as I expect there's similar amount of effort being put 
between #23952 and this.

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