Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/19098
  
    Hm, I wonder how that results in an assertion? that's a normal error case 
and shouldn't cause an assert. Is it from a third-party library in this case, 
like Arrow? really we should fix that somehow so that the user-visible contract 
for this behavior never involves AssertionError.
    
    Still, assertions ought to be _enabled_ during tests anyway, so I don't see 
how this doesn't actually fire. If it only affects the Maven build I'd suspect 
that maybe the scalatest-maven-plugin somehow doesn't turn on assertions? but 
it has `-ea` in its command line.


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