Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/20169
  
    Let me explain my point here. I am not trying to offend anybody. Spark is 
becoming more and more complex. Peer review and test cases are the major 
methods we used for quality control. Spark is an infrastructure software, 
instead of an application software. We really need to be careful when reviewing 
the PRs. Nobody's codes are perfect. For example, if I made a change in SHS, I 
will ping @vanzin for sure, because @vanzin is the original author and the most 
active committer of SHS.
    
    Personally, I am doing my best to review the changes in the SQL. It would 
be nice if you can ping me or @cloud-fan . Since Spark 2.3 release is the 
recent focus, the current focus of the whole community is for testing and 
reviewing the changes of Spark 2.3 release. 
    
    Regarding this PR, I think we do not need to introduce new parameter 
`warehouseDir`, which is already contained in `hadoopConf `. Keeping the 
interface clean is always good, I believe. Please review my follow-up PR: 
https://github.com/apache/spark/pull/20377


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