westonpace commented on pull request #11223:
URL: https://github.com/apache/arrow/pull/11223#issuecomment-929169128


   > I think the main question here is "what does it bring compared to the 
statu quo?".
   
   @pitrou 
   
   Arguably nothing.  Many of the cases that are checked here are also checked 
by C++ unit tests.
   
   That being said, the status quo was not doing a great job of catching gaps 
in type support.  For example, some kernels added signatures for timestamp that 
were too strict.  Other kernels missed certain types (fixed_list, 
fixed_binary).  Still other kernels intentionally left support for certain 
types unfinished but then it is hard to track what still needs to be done.
   
   It also serves as a single point of reference for what kernels we expect to 
work.
   
   However, if we don't want this running regression I'm ok with that too.  I 
can just run it occasionally on my side.


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